# Worksheet: Rate Graphs

In this worksheet, we will practice interpreting graphs from rate of reaction experiments.

Q1:

The graph shows how temperature affects the rate of reaction. If the reaction is run at , how much is produced after 90 seconds? • A30 cm3
• B300 cm3
• C60 cm3
• D15 cm3
• E1,800 cm3

Q2:

In experiment A, a piece of magnesium foil was allowed to dissolve completely in 20 cm3 of sulfuric acid. The hydrogen gas was collected and the volume was recorded at set time intervals. In experiment B, a second piece of magnesium foil with the same mass and surface area was added to 40 cm3 of the same solution of sulfuric acid and the results were once again recorded. Which graph shows the results of experiments A and B?

• A • B • C • D • E Q3:

Use the information on the graph to calculate the rate of reaction. Give your answer to 1 decimal place. • A7.1 g/min
• B14.2 g/min
• C0.2 g/min
• D40.8 g/min
• E0.1 g/min

Q4:

Considering the results on the graph, when is the rate of reaction greatest? • A0–30 seconds
• B360–390 seconds
• C60–90 seconds
• D150–180 seconds
• E240–270 seconds

Q5:

A single lump of magnesium carbonate reacts with hydrochloric acid to produce magnesium chloride, carbon dioxide, and water. The amount of collected in this experiment is shown on the graph. Which statement does not explain why the curve levels out? • ANo more gas is being produced.
• BThe surface area of magnesium carbonate has increased.
• CThe reaction has finished.
• DThe hydrochloric acid has been used up.
• EThe magnesium carbonate has been used up.

Q6:

The reaction between aqueous hydrochloric acid and marble chips (calcium carbonate) results in a loss of mass in the reaction vessel. The graph shows the results of two versions of this experiment, A and B. Which of the following statements explains the difference between the two sets of results? • AExperiment A uses a catalyst.
• BThe temperature is higher in experiment A.
• CThe reaction vessel in experiment A was gently shaken.
• DLarger marble chips are used in experiment B.
• EThe hydrochloric acid in experiment B is more concentrated.

Q7:

Student A reacts excess hydrochloric acid with 5 large marble chips weighing 15 g in total. Student B performs the same experiment but crushes his 15 g of marble chips into smaller pieces. Which of the following sketch graphs shows the results of the two experiments, correctly labeled for student A and student B?

• A • B • C • D • E Q8:

Calculate the average rate of consumption of compound during the first 30 seconds. • A2.0 g/s
• B3.3 g/s
• C1.5 g/s
• D0.7 g/s
• E2.7 g/s

Q9:

The following chemical reaction is an example of autocatalysis. The produced acts as a catalyst for the reaction shown.

Which of the following graphs best represents the rate of reaction versus time for this kind of reaction?

• A • B • C • D • E Q10:

Calculate the average rate of production after the first 5 minutes. Give your answer to 2 decimal places. Q11:

The results from an experiment examining the decomposition of hydrogen peroxide were plotted onto the sketch graph shown. Which statement best describes how the rate of reaction may change over time?

• AThe rate of reaction decreases to zero.
• BThe rate of reaction increases then levels out at a steady value.
• CThe rate of reaction increases then decreases to zero.
• DThe rate of reaction does not change over time.
• EThe rate of reaction steadily increases.

Q12:

What is the rate of reaction at point B? Give your answer to one decimal place. • A0.8 cm3/s
• B1.2 cm3/s
• C2.5 cm3/s
• D0.4 cm3/s
• E0.6 cm3/s