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Chemistry

07/22/23

An overall 1st order reaction has a rate constant of 1.8 x 10^-3 1/s. How long will it take for the reaction to be 30% complete?

Answer choices: 240 s198 s 1730 s 129 s None of the above

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Chemistry

07/22/23

In the reaction of C5H12 + O2 = CO2 + H2O, the rate of formation of CO2 is 0.18 M/s. What is the rate of formation for C5H12 in M/s?

Answer choices: (Δ[O2])/Δt = 0.18(Δ[O2])/Δt = -0.036 (Δ[O2])/Δt = -0.216 None of the above (Δ[O2])/Δt = -0.288

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Chemistry

07/22/23

Given the rate constant to be 2.3E-4 s^-1 AT 40 degrees C and activation energy to be 62 kj/mol, at what temperature will the rate constant be 3.8E-2?

Answer choices: 831 KNone of the above398 KNone of the above125 K

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Chemistry

07/22/23

At a certain temperature, Kc is 7.98 x 10 -2 for the equilibrium: 2 A (g)--> B (g) + C (g). What are the concentrations of B(g) and C (g) in equilibrium with 0.0566 moles/liter of A(g) ?

1.60 x 10 ^-2 M3.20 x 10^-3 M1.28 x 10^-4 MNone of the above2.56 x 10^-4 M

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Chemistry

07/21/23

Percentage yield of carbon dioxide

When 19.4g of acetylene c2h2 is allowed to react with excess oxygen, 7.12g of CO2 are formed. What is the percentage yield of carbon dioxide?

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Chemistry

07/21/23

A zeroth order reaction A = B has [A]0 = 0.52 M. After 3.0 min, [A]t = .0015M. What is the rate constant in units of Ms-1?

k = 2.88 E-3 M/s None of the above k = -2.88 E-3 M/s k = 9.60 E-4 M/s k = - 9.60 E-4 M/s

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Chemistry

07/21/23

A zeroth order reaction A = B has [A]0 = 0.012 M. After 5.0 min, [A] = .008M. What is the rate constant in units of Ms-1?

Answer choices: None of the abovek = -1.3 E-5 M/s k = - 8.0 E-4 M/s k = 1.3 E-5 M/s k = 8.0 E-4 M/s

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Chemistry

07/21/23

The density of 95% by mass of sulphuric acid, H2S04 is 1.84 g ml-1. Calculate the morality of H2SO4.

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Chemistry

07/21/23

Select the statement that is false for an average reaction rate plot.

None of the aboveThe average rate of change is fastest at the beginning of the experimentThe average rate of change is constant after enough time has elapsedThe average rate of change is constant... more

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Chemistry

07/21/23

The reaction 2A + 2B → 2C + D is first order in A and zeroth order in B. When [A]=0.03M and [B]=0.05M, the initial rate of the reaction is 7E-5 M/s. What is the value of the rate constant (k)?

Answer choices:1.4E-3 s-14.6E-2 s-1 2.3E-3 s-1 7.5E-5 s-1 None of the above

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Chemistry

07/21/23

If the rate of formation of C is 0.526 M/s, what is the rate of disappearance of B for the following reaction A + 3B → 2C?

0.088 M/s None of the above 0.274 M/s 0.589 M/s 0.789 M/s

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Chemistry

07/21/23

What is the order of B in the reaction A + B -----> C

Second orderFirst orderZero orderMore information is neededNone of the above

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Chemistry

07/21/23

In the reaction of C5H12 + O2 = CO2 + H2O, the rate of formation of CO2 is 0.18 M/s. What is the rate of formation for C5H12 in M/s?

Answer choices: (Δ[O2])/Δt = -0.216(Δ[O2])/Δt = 0.18 (Δ[O2])/Δt = -0.288 None of the above (Δ[O2])/Δt = -0.036

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Chemistry

07/21/23

What is the order of the following expression, 2A+ 2B------> C .

All of the aboveNone of the above Zero order First order None of the above

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Chemistry

07/21/23

What steps are needed to calculate the number of atoms of H in 5.00 g of CH4

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Chemistry

07/20/23

Chemistry Calculating mass in equilibrium reaction

Bromine monochloride is synthesized using the reactionBr2(g)+Cl2(g)↽−−⇀2BrCl(g) 𝐾p=1.1×10−4 at 150 A 204.0 L204.0 L flask initially... more

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Chemistry

07/20/23

Preparation KNO3 solutions

I need to make 1 mg-N/L, 2 mg-N/L, 4 mg-N/L, 8mg-N/L. 16mg-N/L, 32mg-N/L, 64 mg-N/L of KNO3 solutions? what would be the easiest way to prepare it?

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Chemistry Biology Biochemistry

07/20/23

Please Help! Chemistry

Atomic nuclei can undergo two types of nuclear changes: fusion and fission. In one paragraph, compare and contrast these two changes and provide a real-world example of each type. e12.q21

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Chemistry

07/19/23

The reaction 3A + 2B → 2C + 6D is found to be third order overall and third order with respect to A. What is the most likely rate law?

rate = k[A]^3 None of the above rate = k[A]^3[C] rate = k[A]^3[B]^2 rate = k[B]^3

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Chemistry

07/19/23

Select the statement that is false for an average reaction rate plot.

The average rate of change is constant after enough time has elapsed None of the above The steeper the slope, the faster the rate of reaction over a specific time interval The average... more

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Chemistry

07/19/23

Given the rate law rate=k[H2][NO]^2 and the value of k at 1000K is 38 M^-1 s^-1, find the rate when [H2]=0.006M and [NO]=0.004M

Answer choices: 8.10E-5 M/s5.21E-4 M/s1.88E-8 M/s3.65E-6 M/s None of the above

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Chemistry

07/18/23

The effect of pH on solubility

The 𝐾sp of PbBr2 is 6.60×10−6. What is the molar solubility of PbBr2 in pure water? molar solubility: ? M What is the molar solubility of PbBr2 in 0.500 M KBr solution? molar solubility: ? M What... more

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Chemistry

07/18/23

Solubility product constant

The 𝐾sp of zinc hydroxide, Zn(OH)2, is 3.00×10−17. Calculate the solubility of this compound in grams per liter.solubility: ? g/L

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Chemistry

07/17/23

Titrations of Weak Acids

Calculate the pH for each case in the titration of 50.0 mL of 0.220 M HClO(aq) with 0.220 M KOH(aq). Use the ionization constant for HClO. What is the pH before addition of any KOH? pH=?What... more

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Chemistry

07/17/23

Titrations of Weak Acids

Calculate the pH at the equivalence point for the titration of 0.210 M0.210 M methylamine (CH3NH2)(CH3NH2) with 0.210 M HCl.0.210 M HCl. The 𝐾b of methylamine is 5.0×10−4.5.0×10−4.pH=?

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An overall 1st order reaction has a rate constant of 1.8 x 10^-3 1/s. How long will it take for the reaction to be 30% complete?

In the reaction of C5H12 + O2 = CO2 + H2O, the rate of formation of CO2 is 0.18 M/s. What is the rate of formation for C5H12 in M/s?

Given the rate constant to be 2.3E-4 s^-1 AT 40 degrees C and activation energy to be 62 kj/mol, at what temperature will the rate constant be 3.8E-2?

At a certain temperature, Kc is 7.98 x 10 -2 for the equilibrium: 2 A (g)--> B (g) + C (g). What are the concentrations of B(g) and C (g) in equilibrium with 0.0566 moles/liter of A(g) ?

Percentage yield of carbon dioxide

A zeroth order reaction A = B has [A]0 = 0.52 M. After 3.0 min, [A]t = .0015M. What is the rate constant in units of Ms-1?

A zeroth order reaction A = B has [A]0 = 0.012 M. After 5.0 min, [A] = .008M. What is the rate constant in units of Ms-1?

The density of 95% by mass of sulphuric acid, H2S04 is 1.84 g ml-1. Calculate the morality of H2SO4.

Select the statement that is false for an average reaction rate plot.

The reaction 2A + 2B → 2C + D is first order in A and zeroth order in B. When [A]=0.03M and [B]=0.05M, the initial rate of the reaction is 7E-5 M/s. What is the value of the rate constant (k)?

If the rate of formation of C is 0.526 M/s, what is the rate of disappearance of B for the following reaction A + 3B → 2C?

What is the order of B in the reaction A + B -----> C

In the reaction of C5H12 + O2 = CO2 + H2O, the rate of formation of CO2 is 0.18 M/s. What is the rate of formation for C5H12 in M/s?

What is the order of the following expression, 2A+ 2B------> C .

What steps are needed to calculate the number of atoms of H in 5.00 g of CH4

Chemistry Calculating mass in equilibrium reaction

Preparation KNO3 solutions

Please Help! Chemistry

The reaction 3A + 2B → 2C + 6D is found to be third order overall and third order with respect to A. What is the most likely rate law?

Select the statement that is false for an average reaction rate plot.

Given the rate law rate=k[H2][NO]^2 and the value of k at 1000K is 38 M^-1 s^-1, find the rate when [H2]=0.006M and [NO]=0.004M

The effect of pH on solubility

Solubility product constant

Titrations of Weak Acids

Titrations of Weak Acids

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