Calculate AH°rxn from AH°7 values (use table in textbook appendix) a) Cl2 (g) + 2 Na (s) -› 2 NaCl (s) EITHER -411.1kJ/mol b) 2 H2S (g) + 3 02 (g) -> 2 SO2 (g) + 2 H20 (g)

The amount of matter that makes up a physical body is known as its mass. Inertia, or the body's resistance to acceleration when a net force is applied, is also measured by this property. The gravitational pull an object has on other bodies is also determined by its mass. The kilogram serves as the SI's fundamental unit of mass.

The substance's density is defined as its mass per unit of volume. Although the Latin letter D can also be used, the most common symbol for density is.

The amount of three-dimensional space that is occupied is measured by volume. It is frequently expressed quantitatively using SI-derived units or different imperial units. Volume and the notion of length are connected.

The mass of an object divided by its volume is the formula for determining density. Mathematically, this is represented as d = m/v, where d stands for density, m for mass, and v for object volume. The common measurements are kg/m3.

Using, d = m/v

m = d * v

m = 8 * 5 = 40 g/cm³

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The two elements that one would expect to form an ionic bond when combined is Na and F (option D).

Ionic bond is the type of chemical bond where two atoms or molecules are connected to each other by electrostatic attraction.

Ionic bond is formed by a metallic element, which is usually positively charged (+) and a nonmetallic element, which is usually negatively charged (-).

According to this question, sodium (Na) is positively charged while fluorine (F) is negatively charged (-). This means that when Na and F combines chemically, sodium will donate electrons to fluorine atom forming an ionic bond.

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According to the given statement If ml, then l must be either equal to or greater than 2 in this case.

The maximum value of l that can currently be assigned to all known atoms in their ground states is 3. The letters d and f, respectively, stand in for these l values, which are 2 and 3, respectively.

The number of protons an atom has makes it distinct from other atoms. Therefore, a particle devoid of electrons is not an atom. But even a single proton constitutes an atom (of hydrogen). Single atoms of the 2 of the periodic elements like sodium, uranium, oxygen, and chloride are examples of atoms.

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Answer: Red 40 my brother

Explanation:

For a fish to completely decompose if there were no decomposers, it takes few days to more than a week.

Decomposers are living organisms like fungi and bacteria. These decomposers are heterotrophic which means they must take the nutrients and it cannot make its own food. Decomposers play an eminent role in an ecosystem because of their process of nutrition.

They break down the dead plants and the animals. These break down the waste of the organisms. They are very eminent for all the ecosystem. If these were not in the ecosystem, the plants cannot get essential nutrients, dead matter and waste would deposit. So the nutrients in them gets recycled back so that they can be used again.

When fish dies, there is nothing which is ingested and the bladder air starts to release, which causes the fish to sink to the bottom. After few days, the internal organs of the dead fish gets decomposed, after which a gas is formed.

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Answer: It is Neutron

Explanation:

²⁷₁₃Al + ⁴₂α = ³⁰₁₅P + ?

27 + 4 = 30 + M

31 = 30 + M

-30  -30

1 = M

13 + 2 = 15 + Z

15 = 15 + z

-15 = -15

0 = z

¹₀n

Box has more acceleration as compared to the refrigerator because of more weight of a refrigerator.

Acceleration is defined as the process where the velocity of a body changes. Velocity is the combination of speed and direction. For getting acceleration, a change in speed or change in direction or change occurs in both. There are three types of acceleration i.e. uniform acceleration, non-uniform acceleration, and average acceleration. Uniform acceleration is the motion of an object that travels in a straight line with an increase in velocity at equal intervals of time. The main difference between the acceleration of the box and the refrigerator is that the mass of the box is lower than the refrigerator because of more weight of the refrigerator than the box.

So we can conclude that box has less weight as compared to the refrigerator which leads to more acceleration of the box.

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100 mmol of sodium hydroxide are consumed in this reaction.

What is titration ?

A titration is a method for figuring out the concentration of an unknown solution by using a solution with known concentration. Until the reaction is finished, the titrant (the known solution) is typically added from a buret to a known volume of the analyte (the unknown solution). The concentration of the unknown can be determined by knowing the amount of titrant that was added. An indicator is frequently used to indicate the reaction's endpoint or end of the reaction.

Titration, also known as titrimetry, is a common quantitative chemical analysis technique used in labs to determine the unknown amount of an analyte (Medwick and Kirschner, 2010). Due to its reliance on volume measurements, titration is frequently referred to as volumetric analysis. The reagent known as the titrant or titrator is made into a standard solution. A solution of the analyte or titrand reacts with a titrant that has a known concentration and volume to determine concentration. The volume of the titrant that has responded is the titration volume. Titrations can take many different shapes and have different processes and goals. The two most common kinds of qualitative titrations are redox and acid-base titrations.

Convert molarity into number of mols:

HCl + NaOH = H2O + NaCl 100 mmol of NaOH are consumed in the process for every mol of hydrochloric acid ingested (33 mL x 3M = 100 mmol).

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The density of the metal, given that it has a mass of 51.842 grams is 19.2 g/mL

First, we shall determine the volume of the metal. This can be obtained as follow:

Volume of metal = (Volume of water + metal) - volume of water

Volume of metal = 19.8 – 17.1

Volume of metal = 2.7 mL

Finally, we shall determine the density of the metal. This is illustrated below:

Density = mass / volume

Density of metal = 51.842 / 2.7

Density of metal = 19.2 g/mL

From the above calculations, we can conclude that the density of the metal is 19.2 g/mL

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Baking powder solution has an effect on a diluted hydrochloric acid solution by causing the release of carbon dioxide from sodium bicarbonate, a component of baking soda.

One molecule of backing soda + one molecule of hydrochloric acid yields one molecule of sodium chloride (table salt) + one molecule of carbon dioxide + one molecule of water.

HCl + NaHCO₃=NaCl+H₂CO₃

However, carbonic acid is quite unstable:

H₂CO₃ = CO₂ + H₂O

HCl + NaHCO₃ = NaCl + H₂O (Water) + CO₂.

Effervescence, which is a fast bubble formation, is how liquid releases CO2.

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When you are close to tobacco smoke sources, you may unintentionally breathe in secondhand smoke, often known as passive smoking.

For instance, you might interact with smokers at events or gatherings where smoking is permitted. Even though you might not notice any changes, secondhand smoke exposure can be harmful to your health.

It's not simply uncomfortable for your friends and family when they inhale your secondhand smoke; this is what we refer to as passive smoking. It can also be harmful to their health.

Regular secondhand smoke exposure increases the risk of developing heart disease and lung cancer, two diseases that smokers are more prone to develop.

Smoking tobacco products both actively and passively as well as exposure to some hazardous chemicals are the two main causes of lung cancer. Smoking tobacco most certainly causes respiratory issues, mouth and lung cancer, and both.

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The strength of force that you use to move a tennis ball a short distance is option d: weak .

A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.

Therefore, The word "force" has a specific meaning in science. At this level, calling a force a push or a pull is entirely appropriate. A force is not something an object "has in it" or that it "contains."

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See full question below

Q.

What strength of force do you use to move a tennis ball a short distance?

answer choices

large

medium

strong

weak

Answer:

As a metal, it is (was) widely used for its malleability, ductility, and its resistance to corrosion, making popular in older plumbing systems. Strangely, even as a metal, it is not a good conductor of electricity.

1) Write the chemical equation.

2) List the known and unknown quantities.

Sample1: H2O2.

Mass: 8.33 g.

Sample2: N2H4.

Mass: 6.48 g.

Sample3: N2

Mass of N2 produced: unknown

3) Convert mass to moles.

3.1-Convert the mass of H2O2 to moles of H2O2.

The molar mass of H2O2 is 34.01468 g/mol.

We have 0.244894 mol H2O2.

3.2-Convert the mass of N2H4 to moles of H2O2.

The molar mass of N2H4 is 32.04516 g/mol.

We have 0.202215 mol N2H4.

4) Limiting reactant.

4.1-How many moles of N2H4 do we need to use all of the H2O2?

The molar ratio between N2H4 and H2O2 is 1 mol N2H4: 2 mol H2O2.

We need 0.122447 mol N2H4 and we have 0.202215 mol. We have enough N2H4. This is the excess reactant.

4.1-How many moles of H2O2 do we need to use all of the N2H4?

The molar ratio between N2H4 and H2O2 is 1 mol N2H4: 2 mol H2O2.

We need 0.40443 mol H2O2 and we have 0.244894 mol H2O2. We do not have enough H2O2. This is the limiting reactant.

5) Moles of N2 produced from the limiting reactant.

Limiting reactant: We have 0.244894 mol H2O2.

The molar ratio between H2O2 and N2 is 2 mol H2O2: 1 mol N2.

6) Convert moles of N2 to mass of N2.

The molar mass of N2 is 28.01340 g/mol.

The mass of N2 produced in the reaction is 3.43 g N2.

.

Answer:

Explanation:

C looks correct to me!

Quantum numbers in the bonding of chemicals. ... called p orbitals; a d subshell (l = 2) is made up of five orbitals, or d orbitals, and has a length of two. The magnetic quantum number, ml, which can take the 2l + 1 values l, l 1,..., l, is used to identify each individual orbital.

When electrons jump between an atom's lowest p and d orbitals, they produce a series of spectral lines known as the diffuse series. Between 1 and 2, the total orbital angular momentum varies. The primary focus of CFT is the interaction of the five (n 1)d orbitals with ligands arranged around a transition-metal ion in a regular array. We will concentrate on using CFT to visualize octahedral complexes, which are by far the most prevalent and straightforward to visualize.

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Acetinilide is recrystallized using water as a solvent since it has a much higher solubility in hot water than in cold water. the purified solid will not recrystallize later in the experiment if high amount of hot solvent is added in the beginning. So we need to dissolve the sample in minimum amount of boiling water

What is  recrystallizing  ?

A purification method called recrystallization is used to get rid of contaminants from a sample. The impure sample is dissolved in an ethanol- or water-based solvent. The material dissolves in the liquid solvent after some brief heating. The solid precipitates out of the solution when the solvent cools down once more, leaving the impurities in the solvent that are still dissolved behind.

Then activated charcoal is added to remove the coloured impurities. After hot film pareshan insoluble impurities are removed. And then cold filtration separates the solid from solution.

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The volume of a 14.00g of nitrogen at 5.64atm and 315K is 4.59L.

The volume of an ideal gas can be calculated using the following ideal gas equation formula;

PV = nRT

Where;

An ideal gas is a hypothetical gas, whose molecules exhibit no interaction, and undergo elastic collision with each other and with the walls of the container.

The number of moles in 14g of nitrogen can be calculated as follows:

moles = 14g ÷ 14g/mol = 1mol

5.64 × V = 1 × 0.0821 × 315

5.64V = 25.86

V = 25.86 ÷ 5.64

V = 4.59L

Therefore, 4.59L is the volume of the gas

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Balanced net ionic equation for the reaction when AlCl₃ and Na₂S are mixed in aqueous solution is 2AlCl₃ + 3Na₂S → Al₂S₃ + 6NaCl

Net ionic equation is the chemical equation that show only those element compounds and ions that are directly involved in the chemical reaction

First the reaction is

AlCl₃ + Na₂S → Al₂S₃ + Knack

Then this is not the balanced equation so we have to identify the number of products and reactants

Then we have simply obtained

a = 2 (AlCl₃)

b = 3 (Na₂S)

c = 1 (Al₂S₃)

d = 6 (NaCl)

Substitute this vale in the reaction then

2AlCl₃ + 3Na₂S → Al₂S₃ + 6NaCl

Then the equal number of reactant and product are seen so this is the balanced reaction

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MgCl₂ in the reaction forms a precipitate.

The chemical reaction in which two ionic bond combine to form an insoluble salt in a aqueous solution is called precipitation reaction. The formation of a precipitate, an insoluble ionic solid, which is the result of precipitation processes, occurs when cations and anions in an aqueous solution interact. The solubility principles for typical ionic solids can be used to assess if such a reaction happens. MgCl₂ produced as a product in the reaction forms precipitate because it is solid in nature and it is an insoluble salt and not dissolve in solution and forms precipitate on the bottom surface of the solution. Thus, MgCl₂ product in the reaction forms a precipitate.

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Answer:

PbSO4    

Explanation:

just took it

The equation that corresponds to the formation of liquid water is:

H₂ (g)  +  1/2 O₂ (g)  [tex]\longrightarrow[/tex] H₂O (l)

Standard enthalpy of formation can be defined as the enthalpy change when 1 mole of a compound is produced from its elements in their most stable state of aggregation at a temperature of 298.15 K and pressure of 1 atm.

Enthalpy of formation is the standard enthalpy of reaction where two or more reactants combine together to form one mole of the product. The standard enthalpy of formation is measured in units in kilojoule per mole (kJ/mol), joule per mole, or kilocalorie per gram.

All elements in their standard states such as oxygen gas, solid carbon (graphite) have a standard enthalpy of formation of zero.

The water formation reaction has a negative value of the standard enthalpy of formation indicating that the formation of water is an exothermic reaction. One mole of water is formed from the reaction of one mole of hydrogen gas and a half mole of oxygen gas.

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The product of the ionic reaction is H2S + Na2SO4.

A net ionic equation is a chemical equation that describes only the elements compounds, and ions directly involved in a chemical reaction. The net ionic equation describes only the species participating in the reaction while the full ionic equation also includes the spectator ion. To find the formula of an ionic compound first identify the cation and write down its symbol and charge.

Then identify the anion and note its sign and charge. Finally, the two ions combine to form an electrically neutral compound. A bond is ionic if the electronegativity difference between the atoms is so great that one atom can completely pull an electron away from the other atom. This situation is common in compounds that combine the leftmost elements of the periodic table.

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The solution must be stated to the tenths place as follows: 9.3478 + 2.73 = 12.08.

After the decimal, the tenths place is represented by the first digit. After the decimal, the hundredths place is represented by the following digit. The place values are filled in by the remaining digits until there are none left.

As stated below, 2.73 must be added by 9.3478.

9.3478 has five significant figures, compared to 2.73's three.

Addition results in 12.0778.

The output will have decimal places equal to the lowest one of the given numbers, according to the criteria for adding significant figures.

Therefore, there should be two decimal places in this result.

We will now wrap things up. The response will be 12.08 because there is a 7 in third position.

9.3478 + 2.73 = 12.08

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Argon, Neon and Krypton will  react the same.

Nobles gases are generally non reactive gases. in some specific condition krypton react with fluorine and form a solid . xenon react with oxygen and fluorine and form number of compounds. only helium and neon are inert gases. in general noble gases are least reactive. They have high ionization enthalpy and more positive electron gain enthalpy.

Argon is colorless and unreactive gas. Neon is also colorless and unreactive gas. Krypton is also a gas with no color and it does not react with other.

Thus, Argon , Neon and Krypton will react the same.

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Some minerals are only stable under specific pressure and temperature conditions, which leads to metamorphism. Chemical processes transform the minerals in the rock into an assemblage that is stable under the new pressure and temperature circumstances. This happens when pressure and temperature change.

Like heat, pressure increases with depth. The mineral gaps within the Rock may even be forced out by this pressure. Due of this, the mixture is denser.

Metamorphic rocks are created when heat and pressure combine to transform an existing rock into a new one. Contact metamorphism occurs when heated magma makes contact with rock.

Pressure and heat rise with depth. The mineral holes in the rock may really be forced out by this pressure. The upshot of this is that the rocks get denser. Instead of cracking or breaking, the rock flows as a result of the heat and pressure.

Regional metamorphism significantly modifies existing rocks under the intense heat and pressure of tectonic movements.

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Answer:

From lowest to highest, the major layers are the troposphere, stratosphere, mesosphere, thermosphere and exosphere.

Yes, it is fake! The actual density of the ring is lower than that of real gold

To know if the gold ring is fake or not, we shall determine the density of the gold ring. This is shown below:

Density = mass / volume

Density of gold ring = 109 / 6

Density of gold ring = 18.17 g/mL

Comparing the density of the gold ring (i.e 18.17 g/mL) to the density of real gold (i.e 19.3 g/cm³), we can conclude that the gold ring is fake.!

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Taking into account the reaction stoichiometry and ideal gas law, the mass of NaCl that reacted with F₂ at 280 K, 15 L and 1.50 atm is 114.56 grams; and if you have the same volume of fluorine gas at STP, the mass of NaCl reacted is 78.323 grams.

In first place, the balanced reaction is:

F₂ + 2 NaCl  → Cl₂ + 2 NaF

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of gases:

P×V = n×R×T

The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.

You know for F₂:

Replacing in the definition of ideal gas law:

1.50 atm× 15 L = n× 0.082 (atm×L)÷(mol×K)× 280 K

Solving:

(1.50 atm× 15 L)÷ (0.082 (atm×L)÷(mol×K)× 280 K)= n

0.979965 moles= n

Then the following rule of three can be applied: if by stoichiometry of the reaction 1 mole of F₂ reacts with 116.9 grams of NaCl, 0.979965 moles of F₂ reacts with how much mass of NaCl?

mass of NaCl= (0.979965 moles of F₂× 116.9 grams of NaCl)÷ 1 mole of F₂

mass of NaCl= 114.56 grams

Finally, the mass of NaCl reacted is 114.56 grams.

In this case, you have the same volume of fluorine gas at STP:

Replacing in the definition of ideal gas law:

1 atm× 15 L = n× 0.082 (atm×L)÷(mol×K)× 273 K

Solving:

(1 atm× 15 L)÷ (0.082 (atm×L)÷(mol×K)× 273 K)= n

0.67 moles= n

Then the following rule of three can be applied: if by stoichiometry of the reaction 1 mole of F₂ reacts with 116.9 grams of NaCl, 0.67 moles of F₂ reacts with how much mass of NaCl?

mass of NaCl= (0.67 moles of F₂× 116.9 grams of NaCl)÷ 1 mole of F₂

mass of NaCl= 78.323 grams

Finally, the mass of NaCl reacted is 78.323 grams.

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