Chemistry Answers

_______ is a variable in Arrhenius equation. *

a. reactant concentration

b. order of reaction

c. reaction rate

d. temperature

___________ provides a linear equation that allows for the calculation of the concentration of a reactant at a specific time in the reaction. *

a. Chemical kinetics

b. Arrhenius equation

c. Integrated rate law

d. catalysts

Reaction rates can be explained using the concepts of collision theory and __________. 

a. Arrhenius equation

b. Chemical kinetics

c. activation energy

d. progress of reaction

A reaction mechanism may occur in two or more elementary steps. The slowest among these steps is the _____________. 

a. reaction intermediate step

b. overall reaction

c. rate - determining step

d. reaction rate

Reaction rates are affected by reactant concentration and _________. 

a. time

b. temperature

c. collision

d. activation

Initially, a mixture of 0.200 M NO, 0.100 M H_{2} , 0.200 M H_{2}*O was permitted to reach equilibrium (initially there was no*N_{2} ). At equilibrium, the concentration of NO was discovered to be 0.062 M. Determine the value of the equilibrium constant, Ke, for the reaction:

2NO(g) + 2H_{2}(g) N_{2}(g) + 2H_{2}*O(g)

The reaction of bromine gas with chlorine gas has a Kc value of 7.20 at 200°C. If a closed 2.50 L vessel were charged with the two reactants, with the former weighing 9.65 g while the latter is 5.70 g, what would be the equilibrium concentration of the two reactants and BrCl(g)? Determine whether the forward or the reverse reaction will be favored. Explain your answer.

Which substance in each pair has the higher entropy, JUSTIFY YOUR ANSWER 

A. 2 mol of He(g) at 100 K and 1 atm or 2 mol of He(g) at 150 °C and 0.2 atm

B. a mixture of 4 mol of H2 (g) and 1.5 mol of N2(g) at 25 °C and 1 atm or, sample of 3 mol of NH3 (g) at 25°C and 1 atm

Which of the following is TRUE about the law of conservation of energy? *

a. ∆E_sys = ∆E_surr

b. ∆E_sys = -∆E_surr

c. ∆E_sys - ∆E_surr = 0

d. none of the above

What is the ∆E for a gas that releases 43 J of heat and has 120 J of work done on it. *

a. 55 J

b. 77 J

c. 99 J

d. 110 J

Colligative property depends on the amount of ___________. *

a. Solvent

b. Solute

c. Ions