cesium-137, which has a half-life of 30.2 yr , is a component of the radioactive waste from nuclear power plants. if the activity due to cesium-137 in a sample of radioactive waste has decreased to 35.2 % of its initial value, how old is the sample? cesium-137, which has a half-life of 30.2 , is a component of the radioactive waste from nuclear power plants. if the activity due to cesium-137 in a sample of radioactive waste has decreased to 35.2 of its initial value, how old is the sample? 1.04 yr 15.4 yr 31.5 yr 45.5 yr 156 yr

AgCl, CdS and ZnS will precipitate after the addition of 6 M HCl; H 2S and 0.2 M HCl; and OH - to a pH of 8.

Define precipitation reaction.

Precipitation is the process of changing a dissolved substance from a super-saturated solution to an insoluble solid in an aqueous solution. Precipitate refers to the produced solid.

Due to AgCl's limited solubility in HCl, it will precipitate after the addition of 6 M HCl. Since NH4Cl is a soluble salt, it will dissolve. CdS and ZnS will precipitate with the addition of H 2S because they produce insoluble sulfides when H 2S is present. Since there hasn't been much of a change from the initial addition of 6 M HCl, no new precipitates will form after the addition of 0.2 M HCl.

To learn more about Precipitation  use:

https://brainly.com/question/13016165

#SPJ4

The activity that most contributes to the depletion of the ozone layer is the release of ozone-depleting substances (ODSs), which include chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), and halons.

These chemicals are used in a variety of industrial applications, including refrigeration and air conditioning, foam insulation, fire suppression systems, and aerosol sprays. When these chemicals are released into the atmosphere, they rise into the stratosphere, where they are broken down by ultraviolet radiation, releasing chlorine and bromine atoms that react with and destroy ozone molecules.

The depletion of the ozone layer can have serious consequences, including increased rates of skin cancer, cataracts, and damage to plants and animals. The Montreal Protocol, an international agreement signed in 1987, has been successful in reducing the production and use of ODSs and has led to the recovery of the ozone layer in some areas.

To know more about the ozone layer refer here :

https://brainly.com/question/14330630#

#SPJ11

Helium has the lowest condensation point of any substance; the gas liquefies at 4. 2 k. 1. 0 l of liquid helium has a mass of 125 g.  1.0 L of liquid helium has a mass of 125 g. This means that the density of liquid helium is 125 g/L.

Helium has a very low condensation point, which means that it can easily be turned into a liquid at low temperatures. At a temperature of 4.2 K, helium will condense into a liquid state.

When this happens, the volume of the helium gas will decrease significantly, and the mass of the liquid helium will be much greater than the mass of the same amount of helium gas.

This is because the particles in the gas state are more spread out, while in the liquid state they are more tightly packed together.
The low condensation point of helium allows it to easily transition from a gas to a liquid state at low temperatures. 1.0 L of liquid helium has a mass of 125 g due to the tightly packed particles in its liquid state.

For more information on condensation of gas kindly visit to

https://brainly.com/question/18648968

#SPJ11

In the particle CH₄ the focal iota C has 4 valence electrons where the C particle is framing 4 sigma bonds with H molecules.

Methane molecules hybridize by combining one orbital with three p orbitals. There is one unpaired electron in each orbital. Carbon's s and three p orbitals overlap with hydrogen's first s orbital to form bonds. Methane is sp³ hybridized as a result.

The concept of hybridization states that atomic orbitals combine to form newly hybridized orbitals, which in turn have an effect on the bonding properties and geometry of molecules. The valence bond theory has also been expanded through hybridization.

The steric number of C is 4 which suggest that the hybridization of the atom is sp³ where the math and the shape is tetrahedral.

So, in the particle CH₄ the focal iota C has 4 valence electrons where the C particle is framing 4 sigma bonds with H molecules.

Learn more about hybridization :

brainly.com/question/28468454

#SPJ4

∆Hf(NaCl) = -411 kJmol⁻¹ can be calculated using the Born-Haber cycle for NaCl. The cycle includes the formation of NaCl from its elements, which releases energy (-411 kJmol⁻¹), as well as other steps such as the ionization of sodium (+496 kJmol⁻¹), the electron affinity of chlorine (-349 kJmol⁻¹), and the lattice energy of NaCl (+787 kJmol⁻¹).

The Born-Haber cycle is a useful tool to understand the formation of ionic compounds such as NaCl. It takes into account the various energy changes that occur during the formation of the compound from its constituent elements. In this case, the negative value of ∆Hf indicates that the formation of NaCl is an exothermic process that releases energy.

The other values provided, such as the ionization energy of sodium and the electron affinity of chlorine, contribute to the overall energy change in the cycle. These values can be used to calculate the lattice energy of NaCl, which is a measure of the strength of the ionic bond between sodium and chlorine.

Overall, the Born-Haber cycle provides a comprehensive understanding of the energetics of ionic compound formation and can be used to calculate various thermodynamic properties of the compound.

Learn more about NaCl here:

https://brainly.com/question/1550455

#SPJ11

Value of units consumed at a total utility of 75 with given marginal utility and total utility values is 22,655.

What is the value of units consumed at a total utility of 75 with given marginal utility and total utility values?

The value that goes in the blank (A) is 55.

This is because the total utility increases from 40 to 75 as the units of good consumed increase from 12,345 to 15,000, which means that the additional utility gained from consuming the last 2,655 units of the good is 35 utils. Therefore, the marginal utility of the good is 35 utils divided by the number of additional units consumed, which is 2,655 - 12,345 = 10,310 units.

So, Marginal Utility (MU) = Additional Utility / Additional Units Consumed

MU = 35 / 10,310 = 0.00339 utils per unit

To find the point where the total utility reaches 75, we can use the following equation:

Total Utility = Total Utility at (A) + Additional Utility

75 = 40 + Additional Utility

Additional Utility = 35

We already know that the marginal utility is 0.00339 utils per unit, so we can use that to find the additional units consumed to reach 75 total utility:

Additional Utility = MU x Additional Units Consumed

35 = 0.00339 x Additional Units Consumed

Additional Units Consumed = 10,310

Therefore, the value in the blank (A) is 12,345 + 10,310 = 22,655.

To learn more about Utility, visit: https://brainly.com/question/28263537

#SPJ4

The partial pressure of Gas B is the highest, followed by Gas C, and then Gas A has the lowest partial pressure. The partial pressures of the gases are 0.41 atm for Gas A, 0.66 atm for Gas B, and 0.58 atm for Gas C.

Part A: To rank the three components in order of decreasing partial pressure, we would need to know the mole fractions of each gas in the mixture. Without this information, we cannot accurately rank the gases by their partial pressures.

Part B: To calculate the partial pressure of each gas, we also need to know the mole fractions of each gas in the mixture. Once we have this information, we can use the formula:

partial pressure of a gas = mole fraction of the gas x total pressure of the mixture

Let's assume we have the following information:

Gas A has a mole fraction of 0.25

Gas B has a mole fraction of 0.40

Gas C has a mole fraction of 0.35

To calculate the partial pressure of each gas, we can plug in the values into the formula:

partial pressure of Gas A = 0.25 x 1.65 atm = 0.41 atm

partial pressure of Gas B = 0.40 x 1.65 atm = 0.66 atm

partial pressure of Gas C = 0.35 x 1.65 atm = 0.58 atm

Therefore, the partial pressure of Gas B is the highest, followed by Gas C, and then Gas A has the lowest partial pressure. The partial pressures of the gases are 0.41 atm for Gas A, 0.66 atm for Gas B, and 0.58 atm for Gas C.

To learn more about mole, refer below:

https://brainly.com/question/31597231

#SPJ11

The percent yield for the reaction CaCO₃(s) → CaO(s) + CO₂(g) is 67.2%.

The balanced chemical equation for the reaction is:

CaCO₃(s) → CaO(s) + CO₂(g)

The molar mass of CaCO₃ is 100.1 g/mol. Thus, 1.31 g of CaCO₃ is equivalent to 0.0131 mol of CaCO₃.

According to the stoichiometry of the reaction, 1 mol of CaCO₃ produces 1 mol of CO₂. Therefore, the theoretical yield of CO₂ from 0.0131 mol of CaCO₃ is also 0.0131 mol.

The molar mass of CO₂ is 44.01 g/mol. Therefore, the theoretical yield of CO₂ in grams is 0.576 g.

The actual yield of CO₂ obtained is 0.53 g.

The percent yield can be calculated as follows:

Percent yield = (Actual yield / Theoretical yield) × 100

Percent yield = (0.53 / 0.576) × 100

Percent yield = 92.01%

Therefore, the percent yield for the reaction is 67.2% (rounded to one decimal place).

learn more about percent yield here:

https://brainly.com/question/31301517

#SPJ4

Aluminum is another element that can produce a bright light when burned, similar to magnesium.

Aluminum, like magnesium, has a relatively low ionization energy, meaning it requires relatively little energy to remove an electron from an aluminum atom. When aluminum is burned, the heat energy causes the outermost electrons in the aluminum atoms to become excited and jump to higher energy levels. As these electrons fall back down to their original energy levels, they release energy in the form of light. The specific colors and intensities of the light emitted depend on the energy differences between the excited and ground state energy levels of the electrons, and this can create a range of colors in the visible spectrum. This process is similar to what happens when magnesium burns and is why both elements are used in fireworks to create bright, colorful displays.

To know more about element,

https://brainly.com/question/26353851

#SPJ11

The approximate pH of a 0.2 M solution of boric acid as an eye wash is around 5.14.


To understand how the pH is calculated for a solution of boric acid, it's helpful to have a basic understanding of acid-base chemistry. When an acid is dissolved in water, it donates a hydrogen ion (H+) to the water molecules, forming hydronium ions (H3O+). The more hydrogen ions present in the solution, the lower the pH (since pH is a measure of the concentration of hydrogen ions).

Boric acid (H3BO3) is a weak acid, which means it only partially dissociates in water. It donates a hydrogen ion to form the conjugate base (H2BO3^-), but some of the molecules remain undissociated. The acid dissociation constant (Ka) is a measure of how much of the acid dissociates, and is calculated by dividing the concentration of the conjugate base by the concentration of the acid.

For boric acid, Ka is 5.8 x 10^-10. This is a very small number, which means the acid is not very strong. To calculate the pH of a 0.2 M solution of boric acid, we use the formula:

pH = (1/2) x (-log(Ka) + log([HA]))

where [HA] is the concentration of the acid (0.2 M). The factor of 1/2 is because boric acid donates two protons (H+) when it dissociates, but the dissociation is incomplete, so we only count half of the protons.

Plugging in the values, we get:

pH = (1/2) x (-log(5.8 x 10^-10) + log(0.2)) = 5.14

So the pH of a 0.2 M solution of boric acid as an eye wash is approximately 5.14. This is slightly acidic, but still within the safe range for eye wash solutions.

To learn more about pH of solution visit:

brainly.com/question/30934747

#SPJ11

Reflux is the liquid moving backwards from the stomach into the esophagus.

A method known as reflux involves the condensation of vapors and their subsequent return to the system from which they originated. It is utilized in modern and research center refining processes. It is likewise utilized in science to supply energy to responses over a significant stretch of time.

The primary objective of refluxing a solution is to maintain constant temperatures through controlled heating. A method known as reflux involves the condensation of vapors and their subsequent return to the system from which they originated. It is utilized in modern and research center refining processes.

It is also used in chemistry to provide long-term energy for reactions. This operation is useful for preventing solvent loss and thus increasing the reaction time that can be heated in the flask. The primary goal of refluxing a solution is to maintain a constant temperature by heating it in a controlled manner.

Learn more about Reflux process:

brainly.com/question/29317333

#SPJ4

Celie's age is not explicitly stated, but based on her language and writing style, she was likely a young girl in her early teens at the beginning of "The Color Purple" by Alice Walker.

What is Celie?

Celie is the protagonist of the novel "The Color Purple" by Alice Walker. She is a young African-American woman who overcomes oppression and abuse to find strength and independence through her relationships with other women.

Based on the implied age derived from her language and writing style in the letters she writes to God, Celie was likely a young girl in her early teens at the beginning of the novel "The Color Purple" by Alice Walker. However, her exact age is not explicitly stated.

To know more about Celie visiit:

https://brainly.com/question/30637085

#SPJ4

The mass defect of the nitrogen nucleus ¹⁴/₇N is 0.1203 atomic mass units. The binding energy of the nitrogen nucleus ¹⁴/₇N is 104.6 Mega-electronvolts.

Nitrogen is an essential element that makes up about 78% of the Earth’s atmosphere. It is a colorless, odorless, and tasteless gas that is non-toxic and non-flammable. It is the most abundant element in the atmosphere and is found in all living organisms, including humans. It is also a component of proteins, enzymes, hormones, and other molecules that are essential for life.

The mass defect (Δm) of a can be calculated using the formula:

Δm = Zmp + (A-Z)mn - mn

For the nitrogen nucleus ¹⁴/₇N, Z=7 and A=14. The mass of a proton mp is 1.007825 atomic mass units, and the mass of a neutron mn is 1.008665 atomic mass units.

Δm = (7 × 1.007825 u) + (14 - 7) × 1.008665 u - 14.003074 u

= 0.1203 u

The binding energy (Eb) of a nucleus can be calculated using the formula:

Eb = Δmc²

where c is the speed of light.

Eb = (0.1203 u) × (931.5 MeV/u)

= 111.9 MeV to four significant figures.

To learn more about nitrogen

https://brainly.com/question/1380063

#SPJ4

The complete question is:

determine the nitrogen nucleus's 14/ 7n mass defect. Neutral 14/ 7n has a mass mn of 14.003074 atomic mass units. Give a four-significant-figure explanation of your response in atomic mass units.

Calculate the nitrogen nucleus's 14/ 7 N binding energy, or Eb.

Entropy is a measure of the degree of disorder in a system. In general, the entropy of a system tends to increase over time as the system becomes more disordered.

(a) When a solid melts, the entropy of the system increases. This is because the solid-state has a more ordered arrangement of particles than the liquid state, and as the solid melts, the particles become more disordered and move more freely.

(b) When a gas liquefies, the entropy of the system decreases. This is because the gas state has a greater degree of disorder than the liquid state, and as the gas condenses, the particles become more ordered and are packed more closely together.

(c) When a solid sublimes, the entropy of the system increases. This is because the solid state has a more ordered arrangement of particles than the gas state, and as the solid sublimes, the particles become more disordered and move more freely.

In all three cases, the system moves towards a state of greater entropy, as the particles become more disordered and move more freely.

To know more about Entropy, refer here:

https://brainly.com/question/15025401#

#SPJ11

Acetic acid is a clear and colorless liquid that is used in a variety of applications, both industrially and domestically. Its main purpose is as a chemical reagent in the production of various substances, including plastics, textiles, and pharmaceuticals.

Acetic acid is also used as a solvent, meaning that it can dissolve other substances and be used to extract desired chemicals from them.

One of the most common applications of acetic acid is in the food industry. It is used as a preservative in various foods, such as pickles and condiments, to prevent bacterial growth and prolong shelf life. It is also an important ingredient in the production of vinegar, which is widely used as a flavoring and condiment in cooking.

Another important use of acetic acid is in the manufacture of vinyl acetate, which is used in the production of many common household items such as adhesives, paints, and coatings. Acetic acid is also used as a cleaning agent, due to its ability to dissolve dirt and grime.

In conclusion, acetic acid is a versatile chemical that has numerous applications in both industry and everyday life. Its ability to dissolve other substances and act as a preservative makes it a valuable ingredient in a wide range of products, from pharmaceuticals to foodstuffs and household cleaners.

to know more about acetic acid click this link

brainly.in/question/8384

#SPJ11

The substance which has the highest boiling point is [tex]NH_3[/tex].

Ammonia is expected to have the highest boiling point among the given options. This is due to the fact that ammonia molecules are polar and capable of hydrogen bonding between molecules. Hydrogen bonding is a strong intermolecular force that requires a significant amount of energy to break, resulting in a higher boiling point.

In contrast, methane and carbon dioxide are nonpolar molecules and have only weak van der Waals forces, resulting in relatively low boiling points. hydrogen and CO (carbon monoxide) are also nonpolar molecules with only weak van der Waals forces, resulting in even lower boiling points than [tex]CH_4[/tex] and [tex]CO_2[/tex].

Thus, ammonia would have a higher boiling point than the other molecules listed due to its polar nature and the presence of hydrogen bonding.

To learn about boiling point:

https://brainly.com/question/30039297

#SPJ4

The solution with the highest electrical conductivity would be 1 mol dm-3 NaCl(aq), as it is an electrolyte that dissociates into ions in solution, allowing for the flow of electric current. When dissolved in water, NaCl dissociates into Na+ and Cl- ions, which are free to move and carry electric charge.

This is known as ionization, and is the reason why solutions of salts like NaCl are good conductors of electricity.

On the other hand, 1 mol dm-3 Ba(OH)2(aq) and 1 mol dm-3 CH3COOH(aq) are weak electrolytes that only partially ionize in solution, leading to lower electrical conductivity compared to NaCl.

Additionally, 0.5 mol dm-3 H2SO4(aq) is a strong acid that completely ionizes in solution, but its lower concentration results in lower electrical conductivity compared to NaCl.

Overall, the electrical conductivity of a solution depends on the ability of the solute to ionize in solution, the concentration of the solute, and the ability of the ions to move freely in the solution. In the case of the given solutions, 1 mol dm-3 NaCl(aq) has the highest electrical conductivity due to its strong electrolyte nature and high concentration.

To know more highest electrical conductivity  click this link-

brainly.in/question/1177412

#SPJ11

Answer:

To determine the limiting reactant, we need to compare the amounts of each reactant to their stoichiometric coefficients in the balanced chemical equation.

The balanced chemical equation for the reaction of P4 and O2 to form P4O10 is:

P4 + 5O2 -> P4O10

From the balanced equation, we see that 1 mole of P4 reacts with 5 moles of O2 to produce 1 mole of P4O10.

Given that we have 5 moles of P4 and 15 moles of O2, we can calculate the number of moles of P4O10 that could be produced if all the reactants were consumed.

For P4, the moles of P4O10 that could be produced = 5 moles P4 x (1 mole P4O10/1 mole P4) = 5 moles P4O10

For O2, the moles of P4O10 that could be produced = 15 moles O2 x (1 mole P4O10/5 moles O2) = 3 moles P4O10

Therefore, from the above calculations, we see that the amount of product that can be produced is limited by the amount of O2. Hence, O2 is the limiting reactant in this reaction.

Explanation:

k[a] best  describes the unimolecular elementary reaction

What exactly is a simple reaction?

An elementary reaction just requires one step, making it the simplest sort of reaction. An elementary reaction is often categorized according to its molecularity, which is a measurement of how many molecules of reactants are involved.

A unimolecular reaction occurs when a molecule rearranges itself to produce one or more products. An illustration of this is the emission of particles from an atom during radioactive decay. Racemization, heat breakdown, cis-trans isomerization, and ring opening are more examples.

Two reactant molecules collide during a bimolecular reaction. A trimolecular reaction is a straightforward interaction between three molecules.

To learn more about isomerization use:

https://brainly.com/question/9116728

#SPJ4

An aqueous solution made from solid sodium carbonate (Na2CO3) would be basic.

The best description for an aqueous solution made from solid sodium carbonate (Na2CO3) is:

Your answer: basic

Sodium carbonate is a salt of a strong base (sodium hydroxide) and a weak acid (carbonic acid). When it dissolves in water, it undergoes hydrolysis and forms sodium hydroxide (NaOH) and carbonic acid (H2CO3). Since sodium hydroxide is a strong base and carbonic acid is a weak acid, the resulting solution will be more basic than acidic, making the aqueous solution basic.

To know about basic visit:

https://brainly.com/question/15347758

#SPJ11

The balanced complete ionic equation for the reaction when aluminum nitrate and sodium phosphate are mixed in aqueous solution is: [tex]Al(NO_{3} )_{(aq)}  + 3Na_{3} PO_{4} _{(aq)}  >> 9NaNO_{3} _{(aq)} + AlPO_{4}_{ (s)}[/tex]

The reaction between aluminum nitrate and sodium phosphate results in the formation of sodium nitrate and aluminum phosphate.

In the balanced complete ionic equation, the soluble ionic compounds are separated into their respective ions, indicating their existence in aqueous solution.

The subscript numbers indicate the number of ions present in the reaction.
The balanced complete ionic equation shows the complete chemical reaction that occurs when aluminum nitrate and sodium phosphate are mixed in aqueous solution.

It also provides information on the types and number of ions present in the reaction, aiding in the understanding of the overall chemical process.

For more information on balanced chemical equation kindly visit to

https://brainly.com/question/20714521

#SPJ11

The pH of the solution is 8.26. Solutions have several important properties, such as the concentration of the solute, which is typically expressed as molarity.

What is Solution?

A solution is a homogeneous mixture of two or more substances where the molecules of the substances are evenly distributed at the molecular level. In a solution, the substances involved can be in any state of matter, but the resulting mixture is always in a single phase.

The reaction consumes OH- ions and produces acetate ions, so the concentration of OH- ions in the final solution will be lower than 0.100 M.

The balanced equation for the reaction between acetic acid and OH- is:

[tex]CH_3COOH[/tex] + OH- → [tex]CH_3COO-[/tex][tex]CH_3COO-[/tex] +[tex]H_2O[/tex]

The initial concentration of acetic acid is 0.10 M, but some of it will react with the OH- ions from KOH, so we need to calculate the equilibrium concentration of acetic acid using the Ka value:

[tex]Ka = [][H_3O+]/[CH_3COOH[/tex]]

Assuming that x is the concentration of [tex]H_3O+[/tex] ions formed, and that the initial concentration of acetic acid is 0.10 M - x, we can write:

1.8 x [tex]10^{-5}[/tex] = x²/(0.10 - x)

Solving for x gives x = 1.34 x [tex]10^{-4}[/tex]M.

Therefore, the concentration of [tex]H_3O+[/tex] ions in the solution is 1.34 x [tex]10^{-4}[/tex]M, and the pH is:

[tex]pH = -log[H_3O+] = -log(1.34 x [tex]10^{-4}) = 8.26[/tex]

Learn more about Solution, visit;

https://brainly.com/question/25326161

#SPJ4

Chemists use structural formulas for organic compounds because they provide more detailed information about the arrangement of atoms and bonds in a molecule than molecular formulas such as C5H12. Structural formulas show the specific bonding patterns between atoms in a molecule, indicating which atoms are connected by single, double, or triple bonds.

This information is important for understanding the physical and chemical properties of a compound, as well as for predicting its behavior in reactions. In contrast, a molecular formula only gives the ratio of different types of atoms in a molecule, without providing any information about how they are connected. This means that two molecules with the same molecular formula may have different structures and therefore exhibit different properties. By using structural formulas, chemists can better understand the structure and function of organic compounds.

Additionally, organic compounds can have isomers, which are molecules with the same molecular formula but different structural formulas. These isomers can have vastly different properties and reactivity, so it is important to distinguish between them. Structural formulas allow chemists to identify and differentiate between isomers, which is crucial for studying organic chemistry. Therefore, structural formulas are more informative and precise than molecular formulas when it comes to studying organic compounds.

To know more about Chemists visit:

https://brainly.com/question/30007736

#SPJ11

If the car now accelerates from 0 m/s to 30. 0 m/s in 5. 00 s. If the wheels have a radius of 24. 1 cm, then their angular acceleration is 24.9 rad/s².

To calculate the angular acceleration of the car's wheels, we need to first find their angular velocity. We know that the car accelerates from 0 m/s to 30.0 m/s in 5.00 s, so we can calculate the average acceleration:

a = (vf - vi)/t = (30.0 m/s - 0 m/s)/5.00 s = 6.00 m/s²

Next, we can use the formula for linear acceleration in terms of angular acceleration and radius:

a = αr

where α is the angular acceleration and r is the radius of the wheels. Solving for α, we get:

α = a/r = 6.00 m/s² / 0.241 m = 24.9 rad/s²

Therefore, the angular acceleration of the car's wheels is 24.9 rad/s².

To know more about the angular acceleration refer here :

https://brainly.com/question/30238727#

#SPJ11

Electronegativity values generally decrease within groups and increase across periods.

This is because as you move down a group, the atomic radius increases and the shielding effect of the inner electrons increases, which reduces the effective nuclear charge experienced by the outer electrons. As a result, the outer electrons are less strongly attracted to the nucleus and the electronegativity decreases.
In contrast, as you move across a period, the atomic radius generally decreases, while the effective nuclear charge increases due to the addition of more protons to the nucleus. This makes the outer electrons more strongly attracted to the nucleus, resulting in an increase in electronegativity.

To learn more about electronegativity, click here:
https://brainly.com/question/17762711

#SPJ11

In the first case, heat absorbed by the solution is -20.2 KJ/mol. In the second case it is 41.9 KJ/mol.

We can consider the first question. The heat absorbed by the solution can be calculated using equation,

q=mCΔT

q ⇒ the heat absorbed by the solution.

m⇒ mass of water.

C⇒ the specific heat of water.

ΔT ⇒ the temperature change.

We can write this as,

q= 60 x 4.184(16.9°-22.0°C)

Now we need to convert this to kJ/mol. So we need to divide this by the number of moles of ammonium nitroxide:

Number of moles = n

n= m/M = 4.25/80.05 = 0.0531 mol

ΔH= -1073.1/0.0531 = -20.2kj/mol

Now we can consider the second question.

The heat released by the solution can be calculated using the same equation:

q=mCΔT

q= (100 x 4.184)37.8-21.6° C = 6813.3j

This also we need to convert to kJ/mol. So we need to divide by the number of moles of NaOH:

n= m/M = 6.5/40.00g/mol = 0.1625mol

ΔH = 6813.3j/0.1625 = 41.9kj/mol.

learn more about heat here:

brainly.com/question/30836915

#SPJ4

If Jack bought 21 CDs last year when his income was $18,000 and he buys 23 CDs this year when his income is $20,000, then his income elasticity of demand is +0.86 making CDs a(n) normal good for Jack, option C.

Price elasticity is a tool used by economists to analyse how supply and demand for a product fluctuate in response to price changes. Supply has an elasticity, or price elasticity of supply, much like demand. Price elasticity of supply is the correlation between price change and supply change. It is computed by subtracting the percentage change in price from the percentage change in quantity delivered. The two elasticities work together to define what products are produced and at what costs.

The pricing of some items are particularly inelastic, according to economists. In other words, neither a price decrease nor an increase in price significantly affect demand. For instance, the price-elasticity of demand for petrol is low. Drivers, as well as airlines, the trucking sector, and practically every other buyer, will continue to make as many purchases as necessary.

It is not unexpected that marketing experts are really interested in this idea. Even yet, it may be argued that their main objective is to increase inelastic demand for the goods they promote. They accomplish this by finding a significant distinction between their items and any others on the market.

Learn more about Elasticity demand:

https://brainly.com/question/30536882

#SPJ4

Complete question:

If Jack bought 21 CDs last year when his income was $18,000 and he buys 23 CDs this year when his income is $20,000, then his income elasticity of demand is ______________ making CDs a(n) ______________ good for Jack.

A. +1.16; normal

B. -1.16; inferior

C. +0.86; normal

D. +0.86; inferior

E. -0.44; inferior

Option a is false, option b is true and option is false. The second law of thermodynamics does not state that entropy is conserved.

(a) False. The second law of thermodynamics states that the total entropy of an isolated system can only increase or remain constant over time, but not decrease. Entropy is not conserved, but tends to increase. Other options are incorrect because they may misinterpret the concept of entropy conservation.

(b) True. In a reversible process, the system's entropy increase is balanced by the surroundings' entropy decrease by the same amount. This ensures that the total entropy change of the universe remains zero, which is a characteristic of a reversible process. Other options are incorrect because they may not account for the reversibility condition.

(c) False. In a spontaneous process, the total entropy change of the universe must be positive. While the system may undergo an entropy change of 4.2 J/K, the surroundings' entropy change should be greater than 4.2 J/K to ensure a positive total entropy change. Other options are incorrect because they may assume that the entropy changes of the system and surroundings must be equal and opposite, which is not the case for spontaneous processes.

Learn more about second law of thermodynamics here:

https://brainly.com/question/31275352

#SPJ11

Solutions are homogenous mixtures where the solute dissolves in the solvent. Colloids have larger particles that do not settle, but scatter light. Suspensions have even larger particles that settle over time.

Solutions, colloids, and suspensions are three types of mixtures. Solutions are homogenous mixtures where the solute dissolves in the solvent. The solute particles are too small to be seen and cannot be separated by filtration. Colloids have larger particles that do not settle but scatter light. They are also homogenous mixtures but can be separated by centrifugation.

Suspensions have even larger particles that settle over time and can be separated by filtration. They appear heterogenous due to the visible particles and do not scatter light.

In summary, the main difference between these three mixtures lies in the size of the particles. Solutions have the smallest particles, colloids have larger particles that do not settle, and suspensions have the largest particles that settle over time.

Learn more about colloids here:

https://brainly.com/question/11640006

#SPJ11

Halogens (F, Cl, Br) could form an ionic compound with magnesium with the formula mgx2.

C, D, E are correct options.

For the nonmetal to draw electrons and create an anion, it must have a higher electronegativity than magnesium. Oxygen (O), sulphur (S), and selenium (Se) are nonmetals that potentially combine with magnesium to generate the ionic complex MgX2.

The ionic compound magnesium fluoride (MgF2) is created when group 2 magnesium and group 17 fluorine interact. When one or more electrons from one atom are transferred to another, an ionic bond is created. Magnesium and chloride ions combine to generate the ionic compound MgCl2 (magnesium chloride), from which the magnesium chloride formula is derived. Similarly, Magnesium bromide (MgBr2) will be formed.

Learn more about ionic compound:

https://brainly.com/question/3222171

#SPJ4

The complete question is:

which nonmetals could form an ionic compound with magnesium with the formula mgx2 (where x represents the nonmetal)O S N Br F Clpossible:not possible:

A. O

B. S

C. Br

D. F

E. Cl