WorksheetsAQA Trilogy Chemistry P2 Rate & extent of chem change basics
Total questions: 23
Worksheet time: 23mins
Name
Class
Date
1.
What is the rate of a chemical reaction in terms of reactants?
a)
Get bigger
b)
Reactants disappear
c)
How quickly products are formed
d)
How quickly reactants are used up
e)
How quickly products are used up
2.
What is the rate of a chemical reaction in terms of products?
a)
Get bigger
b)
Products disappear
c)
How quickly reactants are formed
d)
How quickly reactants are used up
e)
How quickly products are formed
3.
What is the formula for a mean rate of reaction in terms of reactants?
a)
Time per unit value of reactivity
b)
Time taken for reaction to finish
c)
quantity of reactant used/time taken
d)
quantity of product used/time taken
4.
What is the formula for a mean rate of reaction in terms of products?
a)
Time per unit value of reactivity
b)
Quantity of product formed/time taken
c)
Time taken for product to form
d)
quantity of product used/time taken
5.
How can you measure the quantity of a reactant or product?
a)
Weighing it or collecting gas
b)
Guessing
c)
Observing
d)
Temperature change
6.
What are the two possible units for rate of reaction?
a)
g/min and min/cm3
b)
g/hour and g/cm3
c)
g/hour and min/cm3
d)
cm3/min and min/hour
e)
g/s and cm³/s
7.
How could you measure the rate of a reaction from a graph?
a)
Darw a tangent
b)
Calculate the gradient
c)
Draw a tangent to the curve and calculate the gradient.
d)
Take a mean value
8.
What is "collision theory"?
a)
Stuff banging into each other
b)
Reactionsonly happen when they collide
c)
Most particles bounce off each other
d)
Reactions only occur when particles collide with sufficient energy
9.
What factors can affect the rate of a reaction?
a)
Temp, surface area, concentration, gas pressure, catalyst
b)
Colour, surface area, temp, gas pressure
c)
Concentration, surface area, time, colour
d)
Temp, gas pressure, surface area, luck
e)
Catalyst, temp
10.
State the effect of increasing the surface area on the rate of a reaction
a)
Increases the volume
b)
Increases the time
c)
Decreases the rate
d)
Increases the rate
11.
Explain why increasing surface area increases the rate of a reaction
a)
Bigger the lump, the larger the surface area.
b)
More particles to react
c)
More particles to collide with. Increased frequency of collisions.
d)
Fewer particles. Reduced frequency of collisions
12.
State the effect of increasing concentration on the rate of reaction
a)
Decreases
b)
Increases
c)
No change
d)
Constant
13.
Explain why increasing the concentration increases the rate of reaction
a)
Decreases
b)
More particles to react
c)
More particles available to collide. Increased frequency of collisions.
d)
Fewer particles. Reduced frequency of collisions
14.
State the effect on increasing the pressure of a gas on the rate of reaction
a)
Stays the same
b)
Constant
c)
Decreases
d)
Increases
15.
Explain why increasing pressure of a gas increases the rate.
a)
More particles in a given space, fewer collisions
b)
More particles in a given space. Increased frequency of collisions
c)
Fewer particles. Lower frequency of collisions.
d)
More particles in a given space. Higher concentration.
16.
State the effect of increasing the temperature on the rate of reaction
a)
Increases
b)
Decreases
c)
Stays the same
d)
Constant.
17.
What is the activation energy?
a)
Energy required to reactivate.
b)
Minimum amount of energy required to react.
c)
Minimum temperature required to react.
d)
Maximum energy in a collision.
18.
Explain why increasing the temperature increases the rate of reaction
a)
Increases particle speed. More frequent collisions. More particles with energy greater than Ea.
b)
Increases particle energy. Reduced frequent collisions. Fewer particles with energy lower than Ea.
c)
Increases particle speed. Reduced frequent collisions. Fewer particles with energy greater than Ea.
d)
Increases particle temperature. More frequent collisions. More particles with energy lower than Ea.
19.
What is a catalyst?
a)
Chemical powder
b)
Substance that increases rate but is not used up.
c)
Substance that increases activation energy
d)
Substance that increases the rate and is used up
20.
How do catalysts speed up reactions?
a)
Provide alternative reaction route of lower activation energy.
b)
Provide alternative reaction route of higher activation energy.
c)
Provide reaction route of higher temperature.
d)
Provide alternative reaction route of higher transparency.
21.
What is a reversible reaction?
a)
A reaction which can go from reactants to products but also from products to reactants
b)
A reaction which just goes backwards
22.
What chemical symbol represents a reversible reaction?
a)
⇌
b)
>
c)
<
d)
= ,
e)
O2
23.
If a reaction is exothermic in the forward direction what will it be in the reverse direction?
a)
Exothermic
b)
Cold
c)
Hypothermic
d)
Hot
e)
Endothermic
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