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WorksheetsRate of Reaction (O-Level Chemistry 5070)
Total questions: 35
Worksheet time: 35mins
What is the meaning of the rate of reaction?
Decrease in amount of product
Decrease in amount of product against time
Increase in amount of products against time
Increase in amount of reactants against time
The following equation shows the reaction between calcium carbonate, CaCO3 and hydrochloric acid, HCl:
CaCO3 (aq) + 2HCl (aq) → CaCl2 (aq) + CO2 (g) + H2O (l)
Which of the following is the suitable method to determine the rate of reaction?
Change in the temperature of the solution with time
Change in the volume of carbon dioxide gas with time
Change in the mass of water with time
Change in the concentration of hydrochloric acid with time
Which of the following is the meaning of activation energy?
The maximum energy that the particles need to produce effective collision
The amount of energy used by the particles during a collision
The minimum amount of energy that particles must have in order to react
The amount of kinetic energy of molecules during a collision
Which factor(s) increase the rate of a reaction?
increasing temperature
increasing concentration
increasing total surface area
All of these
Diagram 4 shows the graph of volume of carbon dioxide gas against time when 5 g of marble chips is added to 50 cm3 of 0.2 mol dm-3 hydrochloric acid. At what time the rate of reaction the highest?
t1
t2
t3
t4
Why does a higher temperature increase the rate of a reaction?
It increases both the frequency collision and energy of reactant particles
It only increases the frequency of collision
It only increases the energy of reactant particles
It reduces the activation energy of the reaction
Diagram 7 shows a graph of the volume of gas produced against time for the reaction between zinc granules and hydrochloric acid. The gradient of the graph decreases with time because
catalyst is not used
volume of mixture decreases
temperature of reaction decreases
concentration of hydrochloric acid decreases
Which of the following explains the meaning of effective collision?
The collision where its energy is less than the activation energy
The collision that has a low energy
The collision which takes place before a reaction
The collision that causes a reaction
The equation represents the reaction between sodium carbonate and hydrochloric acid.
Na2CO3 + 2 HCl → 2 NaCl + H2O + CO2
The mass of the beaker and its contents is plotted against time.
Which graph represents what happens when sodium carbonate reacts with an excess of dilute hydrochloric acid?
Magnesium reacts with acid to produce hydrogen gas, H2.Which solution would give the highest initial rate of reaction?
100 cm3 of 1.0 mol dm-3 of nitric acid, HNO3
100 cm3 of 1.0 mol dm-3 of hydrochloric acid, HCl
100 cm3 of 1.0 mol dm-3 of sulphuric acid, H2SO4
100 cm3 of 1.0 mol dm-3 of ethanoic acid, CH3COOH
Catalyst helps to
increase the amount of product obtained
to lower the activation energy
provide an alternative reaction route
decrease the frequency of collision
Diagram 12 shows an energy profile diagram. Ea is the activation energy for the decomposition of hydrogen peroxide.
P
Which of the following is the activation energy for the dissociation of hydrogen peroxide when manganese(IV) oxide is added?
P
Q
R
S
Which manufacturing of the following is not a characteristic of catalyst?
A catalyst is specific in its reaction.
A catalyst influences the quantity of product of a reaction.
The chemical property of a catalyst remains unchanged at the end of the reaction.
Only a little amount of a catalyst is needed to influence the rate of reaction.
Why does breaking up a solid reactant increase the rate of reaction?
it creates more solid
it creates more energy
it increases the total surface area
it increases the concentration
Why does a higher concentration increase the rate of reaction?
it increases the amount of reactants
it lowers the activation energy
it increases the energy of reactant particles
it increases the frequency of collision
Increasing pressure causes the reacting particles
to bond together
to repel from each other
gain more kinetic energy
to move closer together
What does not happen when the temperature is increased?
Particles collide more often
Particles collide with more energy
Particles move faster
More particles collide in the correct orientation
The reaction with the lowest activation energy is
The minimum amount of energy needed for colliding particles to react is called
Chemical Energy
Kinetic Energy
Activation Energy
Potential Energy
Which unit is correct for the rate of reaction?
g mol-1
g min-1
mol dm-3
kJ mol-1
The reaction between zinc, Zn and hydrochloric acid, HCl is represented by the following equation.
Zn + 2HCl → ZnCl2 + H2
A student wants to determine the rate of reaction in a school laboratory. Which of the following methods is the most suitable?
Determine the change in temperature of the solution with time
Determine the change in the concentration of zinc chloride with time
Determine the volume of hydrogen gas given off with time
Determine the change in the concentration of hydrochloric acid with time
The rate of reaction for the decomposition of hydrogen peroxide decreases with time because
product of reaction decreases
temperature of hydrogen peroxide decreases
volume of hydrogen peroxide decreases
concentration of hydrogen peroxide decreases
In which of the chemical reactions can the rate be determined by measuring the change in the gas volume?
Acidified potassium manganate (VII) solution with iron (II) sulphate solution
Sodium hydroxide solution with dilute hydrochloric acid
Silver nitrate solution with sodium chloride solution
Calcium carbonate with dilute hydrochloric acid
Which two diagrams show suitable methods for investigating the speed of the reaction?
The following equation represents the reaction between calcium carbonate, CaCO3 and hydrochloric acid, HCl.
CaCO3 + 2HCl → CaCl2 + CO2 + H2O
Which changes can be used to determine the rate of reaction?
I : mass of calcium carbonate per unit time
II : Volume of carbon dioxide released per unit time
III : Colour of solution per unit time
IV : Mass of precipitate produced per unit time
I and II
I and III
II and IV
III and IV
Which graph shows the correct results?
To increase the rate of a chemical reaction you could...
add more reactant
take away the products
cool down the environment
use a larger container
CaCO3(s) + 2HCl(aq) → CaCl2(aq) + H2O(l) + CO2(g)
A plot of V(CO2) vs time for the reaction is shown. The graph is consistent with the observation that
Which graph shows the effect of increasing temperature on the rate of reaction of calcium carbonate with dilute hydrochloric acid?
