Rates of Reaction Graphs

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

• Catalysts

• Surface Area

• Temperature

• Concentration

• Colour of the Reactants

The ______the surface area exposed to a chemical reaction, the ______ the rate of the reaction.

• larger, slower

• larger, faster

• smaller, faster

Which of the following is not an ideal way to measure the rate of a chemical reaction?

• Change in the volume of liquid

• The time taken for a color change to occur

• Change in mass

• Change in concentration

• The volume of gas produced

A student wants to measure the effect of surface area on the reaction of calcium carbonate with dilute hydrochloric acid. The student performs the experiment several times, using the same mass of iron but changing its surface area. How does the surface area affect the total amount of CO2 gas produced?

• The total amount of CO2 gas produced increases with increasing the surface area.

• The total amount of CO2 gas produced increases with decreasing the surface area.

• The total amount of CO2 gas produced decreases with decreasing the surface area.

• The total amount of CO2 gas produced decreases with increasing the surface area.

• It has no effect; the total amount of CO2 gas produced is always the same.

The chemical timeline below gives examples of different chemical reactions that take place over a range of timescales. Which of the following reactions is likely to occur at point X?

• The reaction of alkali metals with water

• Cooking food

• The chemical weathering of rocks

• Striking a match

How does the concentration of reactants and products generally change over time during a chemical reaction?

• It stays the same for both reactants and products.

• It decreases for reactants and increases for products.

• It increases for reactants and decreases for products.

Which of the following statements best defines the rate of a chemical reaction?

• The measure of change in the concentration of reactants or products per unit of time

• The difference in mass between the reactants and the products

• The final concentration of the products following a chemical reaction

• The speed at which particles need to move in order to successfully collide

The graph below shows how the concentration of a reactant in four different reactions changes over time. Which reaction is the slowest?

• A, blue

• B, red

• C, green

• D, purple

The graph below shows how the concentrations of reactants and products change during a chemical reaction. Which of the chemical species is likely to be the reactant?

• A, blue

• B, red

• C, green

In an experiment, a student added a sample of a solid into a solution, resulting in a chemical reaction. The student repeated the experiment 5 times but changed the surface area of the solid. The graph showing how the concentration of one of the products changes over time for each experiment is shown. In which experiment was the surface area of the solid the greatest?

• A, blue

• B, red

• C, green

• D, purple

• E, orange