Year 12 Chemistry Assignment

Which of the following factors will affect the rate of the reaction represented by the following equation? 2HCl(aq) + CaCO3(s) CaCl2(aq) + H2O(l) + CO2(g)

• I and II only

• II, III and IV only

• I, II and III only

• I, II, III and IV

"The rate of a reaction is proportional to the number of effective collisions occurring per second between the reactants". This statement is associated with the

• kinetic theory

• rate law

• atomic theory

• collision theory

• gas laws

Which of the following factors that affect the rate of chemical reactions can be explained in terms of the collision theory?

• I. Concentration II. Pressure

• I. II and III only

• I and III only

• I, III and IV only

The collision theory purposes that

• reactants collide more frequently to bring about reduction in the reaction rate.

• all collisions of reactants are effective

• reactant must collide with a certain minimum amount of energy to form products.

• the fewer collisions the faster the reaction rate.

Consider the reaction represented by the following equation: H2(g) + I2(g) 2HI(g) The number of effective collisions of molecules of the reactants decreases as

• the temperature is raised

• the pressure is increased

• the volume of the system is increased

• a catalyst is introduced into the system

The following diagram illustrates the rate curve that was obtained when Mg reacted with excess dilute HCl. The diagram become horizontal at x because

• The reaction was slowed down

• All the dilute HCl has reacted

• All the Mg has reacted

• Hydrogen gas is produced at a steady rate

Which of the following factors will affect the rate of the reaction represented by the following equation? 2HCl(aq) + CaCO3(s) CaCl2(aq) + H2O(l) + CO2(g)

• I and II only

• II, III and IV only

• I, II and III only

• I, II, III and IV

Which of the following factors does not affect the rate of reaction of CaCO3 with HCl?

• Temperature of the reaction

• Solubility of the CaCO3

• Concentration of the HCl

• Surface area of the CaCO3

Which of the following factors will affect the rate of the reaction represented by the equation? 2HCl(aq) + CaCO3(s) CaCl2(aq) + H2O(l) + CO2(g)

• I. Pressure

• II. Concentration

• III. Nature of reactants

• IV. Temperature

Which of the following does not affect the rate of a chemical reaction?

• Concentration of the reactants

• Addition or presence of a catalyst

• Size of the reacting particles

• The enthalpy change for the reaction

• Temperature at which the reaction is carried out.