Question 1

What is the rate of a reaction?

Accepted Answer

how quickly reactants are used up or products are produced

Answer

how much product is formed from 1 mol of a certain reactant

Answer

how quickly a reactant gets heated to give off a gas

Answer

how long it takes for a by-product to be formed

Question 2

What is the equation for calculating the mean rate of reaction?

Accepted Answer

$	ext{mean rate}=\frac{	ext {change in quantity of product or reactant}}{	ext {time taken}}$

Answer

$	ext{mean rate}=\frac{	ext {total mass - change in mass}}{	ext {time taken}}$

Answer

$	ext{mean rate}=\frac{	ext {time taken}}{	ext {change in quantity of product or reactant}}$

Answer

$	ext{mean rate}={	ext {change in quantity of product or reactant}}  	imes{	ext {time taken}}$

Question 3

What is the unit for rate of reaction in a reaction involving a change in mass?

Accepted Answer

$	ext{g/s}$

Answer

$	ext{m/s}$

Answer

$	ext{m/g}$

Answer

$	ext{mol/s}$

Question 4

What is the unit for rate of reaction in a reaction involving a change in volume?

Accepted Answer

$	ext{cm}^3/	ext s$

Answer

$	ext{m}^3/	ext s$

Answer

$	ext{cm}^3/	ext{hr}$

Answer

$	ext{mm}^3/	ext{hr}$

Question 5

What is the term used to describe the minimum amount of energy required before a collision will result in a reaction?

Accepted Answer

activation energy

Answer

input energy

Answer

reaction energy

Answer

bond energy

Question 6

What effect does increasing concentration have on the rate of reaction?

Accepted Answer

increases the rate of reaction

Answer

decreases the rate of reaction

Answer

no effect on the rate of reaction

Question 7

Why does increasing concentration have this effect?

Accepted Answer

more reactant particles in the same volume lead to more frequent collisions

Answer

reactant particles have more energy which leads to more frequent collisions

Answer

increasing concentration helps to orientate all the particles leading to more successful collisions

Answer

less space between particles means more frequent collisions

Question 8

What effect does increasing pressure have on the rate of reaction?

Accepted Answer

increases the rate of reaction

Answer

no effect on the rate of reaction

Answer

decreases the rate of reaction

Question 9

Why does increasing pressure have this effect?

Accepted Answer

less space between particles means more frequent collisions

Answer

reactant particles have more energy which leads to more frequent collisions

Answer

more reactant particles in the same volume lead to more frequent collisions

Answer

less spaces means particles collide with the surface of the container more often

Question 10

What effect does increasing surface area have on the rate of reaction?

Accepted Answer

increases the rate of reaction

Answer

no effect on the rate of reaction

Answer

decreases the rate of reaction

Question 11

Why does increasing surface area have this effect?

Accepted Answer

more reactant particles are exposed and able to collide, leading to more frequent collisions

Answer

large surface area means greater absorption of reactants leading to a faster rate of reaction

Answer

more surface means less space in the container leading to more containers

Answer

more reactant particles are exposed providing them with more energy, leading to more successful collisions

Question 12

What effect does increasing temperature have on the rate of reaction?

Accepted Answer

increases the rate of reaction

Answer

stops the reaction as reactants begin to melt/boil

Answer

no effect on the rate of reaction

Answer

decreases the rate of reaction

Question 13

Increasing temperature leads to more successful collisions. Which of these points do NOT explain why this happens?

Accepted Answer

particles expand increasing surface area so leading to more frequent collisions

Answer

particles move faster

Answer

particles have more kinetic energy

Answer

particles have energy greater than the activation energy for the reaction

Question 14

What name is given to a substance that increases the rate of a reaction but is not used up in the reaction?

Accepted Answer

catalyst

Question 15

How do catalysts increase the rate of a reaction?

Accepted Answer

lower the activation energy of the reaction, so more collisions result in a reaction

Answer

transfer energy to the reactants causing them to move faster leading to more collisions

Answer

increases the surface area of reactants by breaking them apart

Answer

reduces the space in the container reducing the space between reacting particles leading to more frequent collisions

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