The most likely formula for the compound between sulfur and aluminum predicted by Lewis theory is Al₂S₃. Option C is correct.
According to Lewis theory, atoms tend to form compounds by sharing electrons to achieve a stable electron configuration. Sulfur has six valence electrons and can form two covalent bonds with aluminum, which has three valence electrons.
Aluminum can donate its three electrons to sulfur, forming three covalent bonds. The resulting compound is Al₂S₃, where two aluminum atoms are bonded with three sulfur atoms through covalent bonds. Therefore, Al₂S₃ is the most likely formula for the compound between sulfur and aluminum predicted by Lewis theory. Option C is correct.
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Balance the equations below (if no coefficient is needed, choose "1" from the options)
1.__K(s) +__ Cl2(g) →__KCI(s)
2. __NH3(g)→__N2(g) +__ H2(g)
3. __Ag(NO3) (aq) +__CaCl2(aq) →__AGCL(s) + __Ca(NO3)2(aq)
4. __CH4(g)+__O₂(g) → __CO2(g)+ __H₂0(g)
Answer:
1. 2K(s) + Cl2(g) → 2KCI(s)
2. 4NH3(g) → 2N2(g) + 6H2(g)
3. 2AgNO3(aq) + CaCl2(aq) → 2AgCl(s) + Ca(NO3)2(aq)
4. CH4(g) + 2O₂(g) → CO2(g) + 2H₂0(g)
If HCl, HNO3, and NaOH solutions were prepared at higher concentrations, will it affect the experimental results? Will the change in concentration make the measurement more accurate or less accurate? Please explain your answers in detail.
If HCl, HNO3, and NaOH solutions were prepared at higher concentrations, the change in concentration will make the measurement more accurate.
Concentration in chemistry is calculated by dividing a constituent's abundance by the mixture's total volume. Mass concentration, concentration in moles, numerical concentration, or volume concentration are four different categories of mathematical description.
Any type of chemical mixture can be referred to by the term "concentration," however solvents and solutes in solutions are most usually mentioned. If HCl, HNO3, and NaOH solutions were prepared at higher concentrations, the change in concentration will make the measurement more accurate.
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PLEASE ANSWER THE MULTIPLE CHOICE QUESTIONS IN THE IMAGE BELOW THIS IS DUE AT 6:00 TODAY
African Americans should take advantage of their power in the labour industry and demand their rights. Therefore, the correct option is option A.
African Americans are a race of Americans who have some or all of their heritage in one of the many black racial groupings of Africa (also known as Black Americans or Americans). The phrase "African American" typically refers to people who were born in the United States but are descended from slaves from Africa.
After White Americans or Hispanic and Latino Americans, African Americans are the third-largest racial and ethnic group in the United States. African Americans should take advantage of their power in the labour industry and demand their rights.
Therefore, the correct option is option A.
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A galvanic cell consists of a Mg electrode in a 1 M Mg(NO3)2 solution and another metal electrode X in a 1 M X(NO3)2 solution.
The galvanic cell has an E°cell value of 1.61 V. Which of the following elements fits the identity of X. (Use table table 18.1)
Select one:
a.
Pb
b.
Zn
c.
Ni
d.
Fe
e.
Mn
Answer:
To determine the identity of metal X, we need to compare the standard reduction potentials of the possible metals with the standard reduction potential of the Mg half-reaction.
From Table 18.1, we can find the standard reduction potentials for each of the metals listed:
Pb: -0.13 V
Zn: -0.76 V
Ni: -0.25 V
Fe: -0.44 V
Mn: -1.18 V
The reduction half-reaction for the Mg electrode is:
Mg2+ + 2e- → Mg E° = -2.37 V
The overall reaction for the galvanic cell is:
Mg(s) + X2+(aq) → Mg2+(aq) + X(s)
The standard cell potential is given by:
E°cell = E°(cathode) - E°(anode)
where the cathode is the reduction half-reaction and the anode is the oxidation half-reaction.
Substituting the given values, we get:
1.61 V = E°(X2+/X) - (-2.37 V)
Simplifying, we get:
E°(X2+/X) = 1.61 V + 2.37 V = 3.98 V
Comparing E°(X2+/X) with the standard reduction potentials in Table 18.1, we see that only zinc (Zn) has a reduction potential that is more negative than 3.98 V. Therefore, the metal X is zinc (Zn).
Therefore, the answer is (b) Zn.
What is the difference in energy levels of the sodium atom if emitted light has a wavelength of 589 nm?
The energy levels of a sodium atom are determined by the wavelength of light emitted by it.
A sodium atom's energy levels may be determined using the equation E = hc/, where h is Planck's constant, c is the speed of light, and is the wavelength.
If the wavelength of the emitted light is 589 nm, the energy levels of the sodium atom are E = hc/589nm = 6.626 x 10-34 x 3 x 108/589 x 10-9 = 4.62 x 10-19 J. This is the energy level of the sodium atom when light with a wavelength of 589 nm is emitted.
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Solar and wind energy are both intermittent resources that cannot be relied upon for a constant stream of energy production. Explain why developing better ways to store energy is an important part of making these energy sources more practical to use.
By removing the need to build additional transmission lines and equipment, energy storage may reduce costs for utilities and their customers.
By removing the need to build additional transmission lines and equipment, energy storage may reduce costs for utilities and their customers. Energy storage's inherent ability to offer backup power in the event of grid failure is a feature that both residential consumers and commercial owners find highly desirable.
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A weather balloon is filled with 14.9 L helium at sea level where the pressure is 1.00 atm at 20.0 °C. The balloon bursts after ascending until the pressure is 26.0 torr at -50.0 °C. Determine the volume (in L) at which the balloon bursts.
The volume at which the balloon bursts is 150.7 L.
To solve this problem, we can use the combined gas law, which relates the pressure, volume, and temperature of a gas.
The combined gas law is expressed as:
(P1 x V1) / (T1) = (P2 x V2) / (T2)
We can convert the initial pressure to torr by multiplying by 760 torr/1 atm, and convert the temperatures to Kelvin by adding 273.15 to the Celsius temperatures.
Substituting the given values into the equation, we get:
(1.00 atm x 14.9 L) / (293.15 K) = [tex](26.0\ torr *V2) / (223.15 K)[/tex]
Solving for V2, we get:
V2 = [tex](1.00\ atm * 14.9 L * 223.15 K) / (293.15 K * 26.0\ torr)[/tex]
= 150.7 L
Therefore, the volume at which the balloon bursts is 150.7 L.
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physical proceses? 2. (a). Calculate the maximum work done when the pressure of 10g of hydrogen is reduced from 20atm to 10atm at a constant temperature of 273°K. If the gas behaves ideally, will there be a change in internal energy? Hence determine the value of q in the process.
An unknown food-dye is analyzed by the method used in this experiment. The absorbance of 5 standard solutions is plotted vs. their concentration (molarity) and a straight line is obtained with the formula:
Abs = 4.600x
An unknown food-dye solution is diluted and it's absorbance is found to be 0.55.
What is the molarity of the diluted unknown, to two significant figures?
The molarity of the diluted unknown food-dye solution is 0.12 M, to two significant figures.
The equation for the standard curve is Abs = 4.600x, where x is the concentration of the food-dye solution in units of Molarity.
To find the concentration of the unknown food-dye solution, we can rearrange the equation as follows:
x = Abs/4.600
Substituting the given absorbance value of 0.55, we get:
x = 0.55/4.600 = 0.12 M
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Draw the valence bond picture for the formation of the molecule 02.
In the formation of O2 molecule, each oxygen atom has six valence electrons. One of these electrons in each oxygen atom is unpaired.
To complete their octets, they share two electrons and form a double bond between them. This can be represented using a Lewis structure, where each oxygen atom shares two electrons with the other oxygen atom.
The valence bond picture for O2 shows two oxygen atoms with unpaired electrons, each forming a sigma bond by overlapping their 2p orbitals in the region between them. The two unpaired electrons of each oxygen atom then overlap to form a pi bond perpendicular to the plane of the sigma bond. The resulting molecule has a triple bond with a bond order of 2, consisting of one sigma bond and two pi bonds.
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What is the solubility (in M) of PbCl2 in a 0.15 M solution of HCl? The Ksp of PbCl2 is 1.6 x 10-5.
7.11 × 10⁻⁴ is the solubility (in M) of PbCl[tex]_2[/tex] in a 0.15 M solution of HCl. The Ksp of PbCl[tex]_2[/tex] is 1.6 x 10⁻⁵.
The capability of a material, the solute, to combine with another material, the solvent, is known as solubility in chemistry. Insolubility, or the solute's inability to create such a solution, is the opposite attribute.
The amount of each of the solute within a saturated solution—a solution whereby no more solute is able to be dissolved—is typically used to gauge the degree of a substance's solubility in a particular solvent.
PbCl[tex]_2[/tex] ⇌ Pb[tex]_2[/tex]⁺(x) + 2Cl⁻ (2x)
HCl ⇌H⁺ (0.15M) + Cl⁻ (0.15M)
Ksp = {Pb[tex]_2[/tex]⁺} {Cl⁻}²
Ksp = {x} {2x+ 0.15}²
2x<0.15
Ksp = {x} {0.15}²
x = 7.11 × 10⁻⁴
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A sample of gas at 2815 torr is cooled from 150.0 C to 100.0 C. Assuming the volume is constant what is the pressure in atm of the gas at 100.0 C
A sample of gas at 2815 torr is cooled from 150.0 C to 100.0 C. Assuming the volume is constant, 2482.2torr is the pressure in atm of the gas at 100.0 C.
The force delivered perpendicularly to an object's surface per unit area across how that force is dispersed is known as pressure (symbol: p / P). The pressure in relation to the surrounding air pressure is known as gauge pressure, also spelt gauge pressure.
Pressure is expressed using a variety of units. Some of these are calculated by dividing a unit of force by a unit of area; for instance, the metric system's unit of pressure, a pascal (Pa), is equal to one newton / square metre (N/m2).
P₁/T₁=P₂/T₂
2815 ×373/423=2482.2torr
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A 52gram sample of water that has an initial temperature of 10C absorbs 4130 joules. If the specific heat of water is 4.184 j what is the final temperature of the water?
A 52gram sample of water that has an initial temperature of 10C absorbs 4130 joules. If the specific heat of water is 4.184 j. 25°C is the final temperature of the water.
The physical concept of temperature indicates in numerical form how hot or cold something is. A thermometer is used to determine temperature. Thermometers are calibrated using several temperature scales, which traditionally drew on different reference locations.
The most popular scales include the Celsius scale, sometimes known as centigrade, with the unit symbol °C, the scale of Fahrenheit (°F), or the Kelvin scale (K), with the latter being mostly used for scientific purposes.
q = m×c×ΔT
4130 = 52×4.184×(T2- 10C)
T2= 25°C
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For the equilibrium: CO(g) + H2O(g) ⇌ CO2(g) + H2(g) KC = 10.0
If 1.6 mol of CO and 1.6 mol of water are initially added to a 2.0 liter flask and the flask is then heated
until the system comes to equilibrium, the concentration of hydrogen will then be _______ M
5. Helium gas, 3.0 x 10-4g, is dissolved in 200 g of solution. Express this concentration in
parts per million.
The concentration of Helium gas in the solution is 1.5 parts per million (ppm).
Solving Concentration in Part Per MillionFirst, we need to convert the mass of helium gas to grams:
3.0 x 10⁻⁴g = 0.0003g
Next, we need to find the total mass of the solution:
Total mass of solution = mass of solvent + mass of solute
Since Helium gas is dissolved in the solvent, we can assume that its mass is negligible compared to the mass of the solvent. Therefore, we can use the mass of the solvent (200 g) as the total mass of the solution.
Now we can calculate the concentration of helium gas in ppm:
Concentration (in ppm) = (mass of solute / total mass of solution) x 10^6
Concentration = (0.0003 g / 200 g) x 10^6
Concentration = 1.5 ppm
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The calculated ΔH reaction will be (too high/ too low/ unaffected), because ΔH reaction is (directly proportional to/ inversely proportional to/ independent of) the value of the heat capacity of the solution.
The calculated ΔH reaction will be unaffected because ΔH reaction is independent of the value of the heat capacity of the solution.
Understanding heat of reactionHeat of reaction is also known as enthalpy of reaction and is defined as the amount of heat energy released or absorbed during a chemical reaction that occurs at constant pressure.
It is the difference between the total enthalpy of the products and the total enthalpy of the reactants, and is usually expressed in units of joules (J) or kilojoules (kJ).
The heat capacity of the solution refers to the amount of heat required to raise the temperature of the solution by a certain amount, whereas ΔH reaction refers to the heat of the chemical reaction itself and is independent of the heat capacity of the solution.
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The enthalpy of vaporization of Substance A is smaller than that of Substance ℬ . Which has a higher boiling point?
At 82 C , Substance C has a vapor pressure of 141 torr and Substance D has a vapor pressure of 131 torr. Which has a higher boiling point?
At 1 atm, substance e boils at 20 C and subtance f boils at 37 C. which has a higher vapor pressure?
Higher boiling points, higher vapor pressures, and higher vapor pressures are shared by substances B, C, and E.
The substance with a higher boiling point will likewise vaporize with a higher enthalpy. Due to a higher vapor pressure, substance D has a higher boiling point than substance C at the same temperature.
Due to its closer resemblance to the average boiling point of a liquid at 1 atm, which is 100°C, substance F has a higher boiling point. The vapor pressure and the boiling point of the liquid has an inverse relation this is why substance E and C are having the higher vapor pressures.
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Calculate the energy in joules and the wavelength in nanometer of the spectra lines produced in the hydrogen spectrum when an electron falls from 4th orbital to the first. Which region of this electromagneric spectrum is in this line?
The concept Rydberg formula is used here to determine the wavelength in nanometer of the spectra lines produced in the hydrogen spectrum when an electron falls from 4th orbital to the first. Here wavelength is -9.72 × 10⁻⁸ m and energy is 12.756 J.
The Rydberg formula is:
1 / λ = RH [ 1 / n₁² - 1 / n₂²]
1 / λ = 1.097 × 10⁷ [ 1 / 4² - 1 / 1² ] = -0.9375
1 / λ = - 10,284,375
λ = -9.72 × 10⁻⁸ m
The energy of hydrogen spectrum is:
Eₙ = -13.606 eV / n²
E₄ = -13.606 / 4² = -0.85
E₁ = -13.606 / 1 = -13.606
E = Eupper - E lower
E = -0.85 - (-13.606) = 12.756 J
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Predict the products for the following reactions (there are TWO products)
Al(s) + FeCl₂ (aq) →
AICI3
FeCl₂
FeCl3
Fe.
AICI₂
AICI
Al
2AlCl[tex]_3[/tex] (aq) and 3Fe (s) are the product for the given reaction 2Al (s) + 3FeCl[tex]_2[/tex] (aq) → 2AlCl[tex]_3[/tex] (aq) + 3Fe (s).
Chemical reaction, the transformation of one or more chemicals (the reactants) into one or more distinct compounds (the products). Chemical elements or chemical compounds make up substances. In a chemical reaction, the atoms that make up the reactants are rearranged to produce various products. 2AlCl[tex]_3[/tex] (aq) and 3Fe (s) are the product for the given reaction 2Al (s) + 3FeCl[tex]_2[/tex] (aq) → 2AlCl[tex]_3[/tex] (aq) + 3Fe (s).
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share the imporatant lesson that you have learned in organic chem
We study the reactions that chemists utilise to create bizarre carbon-based structures in organic chemistry.
The study of the makeup, properties, and responses of organic compounds including organic materials, or matter in any of its many forms that contains carbon atoms, is the subject of the branch of science known as organic chemistry. Their structural formula is determined by study of structure.
We will study the reactions that chemists utilise to create bizarre carbon-based structures in organic chemistry, in addition to the analytical techniques used to characterise them. We'll also consider the molecular reaction mechanisms that are driving those reactions.
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An unknown metal at 100.0∘C with specific heat 1.14 Jg∘C is placed in 750. g of water at 25.0∘C. The final temperature of the water is 28.6∘C. What was the mass of the metal?
Round your answer to the nearest integer.
Use 4.184Jg∘C for the specific heat of water.
Answer:
The heat lost by the metal is equal to the heat gained by the water:
m_metal * C_metal * ΔT = m_water * C_water * ΔT
where m_metal is the mass of the metal, C_metal is its specific heat, m_water is the mass of the water, C_water is its specific heat, and ΔT is the change in temperature.
We need to solve for the mass of the metal, so rearranging the above equation:
m_metal = (m_water * C_water * ΔT) / (C_metal * ΔT)
Substituting the given values:
m_metal = (750. g * 4.184 J/(g⋅∘C) * (28.6∘C - 25.0∘C)) / (1.14 J/(g⋅∘C) * (100.0∘C - 28.6∘C))
m_metal ≈ 663 g
Therefore, the mass of the metal is approximately 663 g.
Explanation:
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Question 14
point)
Helium gas is contained in a tank with a pressure of 14.4 MPa. If the temperature
inside the tank is 24.6 °C and the volume of the tank is 19.4 L, determine the mass,
in grams, of the helium in the tank.
The compound that is not an organic alcohol is:
C 3H 7OH
CH 3CH(OH)CH 3
C 6H 5COOH
(CH 3) 2CHCH(OH)CH 2CH 3
Answer:
The compound that is not an organic alcohol is C6H5COOH.
C3H7OH is propyl alcohol, CH3CH(OH)CH3 is 2-propanol, and (CH3)2CHCH(OH)CH2CH3 is 3-pentanol, all of which are organic alcohols.
On the other hand, C6H5COOH is benzoic acid, which is not an alcohol but an organic acid. It contains a carboxylic acid (-COOH) functional group and not the -OH functional group of alcohols.
Suppose you heat a metal object with a mass of 34.5 g to 95.5 °C and transfer it to a calorimeter containing 100.0 g of water at 17.5 °C. The water and metal reach a final temperature of 24.9 °C.
Metal in a covered cup with a thermometer and heat indicated as leaving the metal.
What is the specific heat of the metal in J/g⋅∘C
Which aqueous solution below is the most acidic?
A.) 11.5 B.) 9.2 C.) 6.7 D.) 2.5
HI is the aqueous solution which is the most acidic. Any aqueous solution in chemistry can be divided into one of three groups, including neutral, basic, or acidic solutions.
Any aqueous solution in chemistry can be divided into one of three groups, including neutral, basic, or acidic solutions. Any aqueous solution with a pH 7.0 ([H+] > 1.0 x 10-7 M) is considered an acidic solution.
Water serves as the solvent in an aqueous solution. Solutions that are acidic are sour, whereas alkaline solutions are soapy, thus it's rarely a good idea to try an unfamiliar solution. HI is the aqueous solution which is the most acidic.
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Which of the following is the correct balanced equation for the neutralized of barium hydroxide with sulfuric acid?
A.) Ba(OH)₂ + H₂SO₄ → BASO₄ + 2 H₂O
B.) BaOH + H₂SO₄ → BaSO₄ + 2 H₂O
C.) BaHO₂ + H₂SO₄ → BaSO₄ + H₂O
D.) Ba(OH)₂ + 2 H₂SO₄ → Ba(SO₄)₂ + 2 H₂O
Ba(OH)₂ + H₂SO₄ → BASO₄ + 2 H₂O is the correct balanced equation for the neutralized of barium hydroxide with sulfuric acid. Therefore, the correct option is option A.
A neutralisation reaction is a chemical process whereby an acid or a base combine to produce water and salt as the end products. H+ ions and OH- ions combine to generate water during a neutralisation reaction. Acid-base neutralisation is the most common type of neutralisation reaction. Ba(OH)₂ + H₂SO₄ → BASO₄ + 2 H₂O is the correct balanced equation for the neutralized of barium hydroxide with sulfuric acid.
Therefore, the correct option is option A.
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Describes the chemical reaction (s) that produce AMD. Equations
are balanced and formatted to show subscripts.
Pls help I’m so confused
There are ____ unpaired up electrons in [Ni(NH3)6]3+
There are 7 unpaired electrons in [Ni(NH[tex]_3[/tex])[tex]_6[/tex]][tex]_3[/tex]⁺. The elementary electric charge of the electron is a negative one, making it a subatomic particle.
The elementary electric charge of the electron is a negative one, making it a subatomic particle. Due to their lack of components or substructure, electrons, which are part for the lepton particle family's first generation, are typically regarded to be elementary particles.
The mass of an electron is roughly 1/1836 that of a proton. The electron has a half-integer inherent angular momentum (spin) that is described in terms of the shortened Planck constant,, among its quantum mechanical features. There are 7 unpaired electrons in [Ni(NH[tex]_3[/tex])[tex]_6[/tex]][tex]_3[/tex]⁺.
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3) Sodium azide is an inorganic compound
that decomposes according the following
reaction.
NaN3(s) Na(s) + N2(g)
a) How many grams of N₂ are produced
when 24.0 g sodium azide decomposes with
75.3% yield?
b) Assume that produced N₂ is collected in a
container, and its pressure is suddenly
released from 4.50 atm to 2.60 atm at
25.0°C. How much work, in joules, is done
during this process?
a) 18.2 g of N2 are created when 24.0 g of sodium azide disintegrate with 75.3% yield. The yield of 18.2 g of N2 is obtained by multiplying 24.0 g of sodium azide by 0.753.
b) The formula W = PV may be used to determine how much work was done throughout this operation. Here, the temperature (T) is 25.0°C, the volume change (V) is -1.90 m3, and the pressure (P) is 4.50 atm.
These numbers when entered into the equation result in a work of -7.48 x 105 J. This represents the labour involved in reducing the pressure from 4.50 atm to 2.60 atm.
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Methane gas, CH4, can be produced by the direct combination of the elements at very high temperatures and pressures. If 5.00 L of hydrogen gas at 600°C and 95.0 ATM of pressure is reacted with excess carbon, calculate how many liters of methane at STP would be produced.
Liters of methane at STP would be produced is 13.2L.
To solve this problem, we need to use the combined gas law to convert the initial conditions of hydrogen gas to STP:
Gas laws are a set of physical laws that describe the behavior of gases under various conditions. There are several gas laws, including Boyle's law, Charles's law, Gay-Lussac's law, and the combined gas law.
Boyle's law states that at a constant temperature, the volume of a gas is inversely proportional to its pressure. In other words, as the pressure of a gas increases, its volume decreases, and vice versa.
5.0 atm x 5.00 L x 273 K)/(1 atm x 873 K) = 123.1 L
So we now know that 5.00 L of hydrogen gas at 600°C and 95.0 atm is equivalent to 123.1 L at STP.
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