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Lesson Worksheet: Rates of Reactions Science

In this worksheet, we will practice describing the rate of a chemical reaction and explaining the effect the type of reagent and the surface area have on it.

Q1:

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

  • ACatalysts
  • BSurface area
  • CTemperature
  • DConcentration
  • EColor of the reactants

Q2:

Fill in the blanks: The the surface area exposed to a chemical reaction, the the rate of the reaction.

  • Alarger, faster
  • Blarger, slower
  • Csmaller, faster

Q3:

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

  • AThe time taken for a color change to occur
  • BThe volume of gas produced
  • CChange in mass
  • DChange in concentration
  • EChange in the volume of liquid

Q4:

A student wants to measure the effect of surface area on the reaction of iron 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 H2 gas produced?

  • AThe total amount of H2 gas produced decreases with increasing the surface area.
  • BThe total amount of H2 gas produced increases with decreasing the surface area.
  • CThe total amount of H2 gas produced decreases with decreasing the surface area.
  • DThe total amount of H2 gas produced increases with increasing the surface area.
  • EIt has no effect; the total amount of H2 gas produced is always the same.

Q5:

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?

  • ACooking food
  • BThe reaction of iron and hydrochloric acid
  • CStriking a match
  • DThe reaction of alkali metals with water
  • EThe chemical weathering of rocks

Q6:

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

  • AIt decreases for reactants and increases for products.
  • BIt stays the same for both reactants and products.
  • CIt increases for reactants and decreases for products.
  • DIt decreases for reactants and products.
  • EIt increases for reactants and products.

Q7:

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

  • AThe measure of change in the concentration of reactants or products per unit of time
  • BThe difference in mass between the reactants and the products
  • CThe final concentration of the products following a chemical reaction
  • DThe speed at which particles need to move in order to successfully collide
  • EThe time at which the concentrations of products and reactants are equal

Q8:

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

  • AA
  • BB
  • CD
  • DC

Q9:

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?

  • AB
  • BC
  • CA

Q10:

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?

  • AC
  • BE
  • CB
  • DA
  • ED

This lesson includes 15 additional questions and 8 additional question variations for subscribers.

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