For the following reaction: C O + N O 2 → C O 2 + N O CO+\ NO_2\ \rightarrow\ CO_2+NO C O + N O 2 → C O 2 + N O will this collision result in an effective collision?

Yes, the molecules are in the correct orientation

No, the molecules are not in the correct orientation

Which of the following increase the reaction rate?

increasing pressure of gaseous reactants

Grinding a seltzer tablet into powder increases the rate of reaction due to...

increased concentration of reactants

better orientation of reactants

The catalyst alters the rate of a chemical reaction by,

providing an alternative pathway with a lower Ea

changing the products formed in the direction of the reaction

providing a surface on which the molecules react

increasing the frequencies of collisions between molecules

The energy diagram shows two different reaction pathways for the same overall reaction at the same temperature. Which pathway is slower and why?

Red, because the activation energy is larger

Blue, because the activation energy is lower

Neither, both reactions progress at the same rate

Which of the following is NOT true at equilibrium?

The concentration of the reactants is equal to the concentration of the products.

The forward and reverse reactions proceed at the same rate.

The concentrations of reactants and products do not change.

The forward and reverse reactions continue to occur.

During equilibrium, the rates of the forward and the reverse reaction are ________

unequal for exothermic reactions

unequal for endothermic reactions

For the following reaction at equilibrium: 2 C r O 4 − 2 + 2 H + ↔ C r 2 O 7 − 2 + H 2 O 2\ CrO_4^{-2}+2\ H^+\ \leftrightarrow\ Cr_2O_7^{-2}+H_2O 2 C r O 4 − 2 + 2 H + ↔ C r 2 O 7 − 2 + H 2 O What happen when H + H^+ H + ion are added to the system?

Equilibrium will shift to right to decrease the added H + H^+ H + ion

Position of equilibrium will shift to left

Color of system will turn from orange to yellow

For the reaction at equilibrium shown above: What happen when CI- ions are added?

Equilibrium shift to left to reduce the added CI - ions

Position of equilibrium will shift to right

Color of system will turn from blue to pink

Concentration of reactants and products remain unchanged

What is the proper K eq for the following reaction? 2 NO (g) + O 2(g) ⇌2 NO 2(g)

K eq = [NO 2 ] 2 / [NO] 2 [O 2 ]

K eq = [NO] 2 [O 2 ] / [NO 2 ] 2

For the reaction... N 2 (g) + 3 H 2 (g) <=> 2 NH 3 (g) If the pressure in the system is increased , which substance(s) will increase in concentration?

NH 3 (as 4 mol gas → 2 mol gas)

N 2 (as 2 mol gas → 4 mol gas)

H 2 (as 2 mol gas → 4 mol gas)

N 2 and H 2 (as 2 mol gas → 4 mol gas)

An equilibrium constant with a large value, e.g. K c = 1000, indicates…

Mostly reactants at equilibrium

What is the equilibrium expression for: Fe 3 O 4 ( s ) + 4H 2 (g) <=> 3Fe( s ) + 4H 2 O(g) K c =

[Fe] 3 [H 2 O] 4 / [Fe 3 O 4 ] [H 2 ] 4

[Fe 3 O 4 ] [H 2 ] 4 / [Fe] 3 [H 2 O] 4

[Fe] [H 2 O] / [Fe 3 O 4 ] [H 2 ]

For the reaction... H 2 (g) + Cl 2 (g) <=> 2HCl (g) + heat If the pressure in the system is increased , the equilibrium position will _______.

not shift position at all as 2 mol gas <=> 2 mol gas

What is the effect of increasing the pressure on the following equilibrium: 2NO(g) + O 2 (g) ⇌2NO 2 (g)?

The concentration of O 2 increases.

PCl 3 (g) + Cl 2 (g) ↔ PCl 5 (g) + energy Which of the following causes an increase in the moles of PCl 5 present at equilibrium shown?

decreasing the volume of the container

adding a mole of He gas at constant volume

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Kinetics and Equilibrium

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Heather Yaros-Ramos

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59 questions

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MULTIPLE CHOICE QUESTION

increase

decrease

stay the same

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NGSS.HS-PS1-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

If the reactant particles collide with less than the activation energy, the particles will be rebound, and no reaction will occur.

True

False

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Kinetics and Equilibrium

59 questions

Under the collision theory, the particles must collide with and for a reaction to occur.

More collisions correspond to a:

Reaction rate means...

To slow down a chemical reaction you will do one of the following:

Why does a higher temperature increase the rate of a reaction?

If the concentration of a reactant is increased, the reaction rate will ___________.

If the reactant particles collide with less than the activation energy, the particles will be rebound, and no reaction will occur.

The collisions which bring about a chemical reaction are called:

Increasing the concentration increases the speed of reaction by

The minimum amount of energy needed for colliding particles to react is called

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Kinetics and Equilibrium

59 questions

Under the collision theory, the particles must collide with ____ and ____ for a reaction to occur.

More collisions correspond to a:

Reaction rate means...

To slow down a chemical reaction you will do one of the following:

Why does a higher temperature increase the rate of a reaction?

If the concentration of a reactant is increased, the reaction rate will ___________.

If the reactant particles collide with less than the activation energy, the particles will be rebound, and no reaction will occur.

The collisions which bring about a chemical reaction are called:

Increasing the concentration increases the speed of reaction by

The minimum amount of energy needed for colliding particles to react is called

Access all questions and much more by creating a free account

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Under the collision theory, the particles must collide with and for a reaction to occur.