Chemistry Practical: Investigating the Effect of Concentration on Reaction Rate

The video tutorial explains an experiment to investigate how increasing the concentration of a reactant affects the rate of reaction, using the reaction between calcium carbonate and hydrochloric acid. It covers the hypothesis based on collision theory, identifies independent, dependent, and control variables, and outlines the experimental procedure. The video also discusses data analysis, including plotting a graph and drawing conclusions about the proportional relationship between reactant concentration and reaction rate.

What is the main hypothesis of the experiment discussed in the video?

• Increasing temperature increases reaction rate.

• Increasing concentration decreases reaction rate.

• Increasing concentration increases reaction rate.

• Decreasing pressure increases reaction rate.

Which variable is changed in the experiment to test the hypothesis?

• Concentration of hydrochloric acid

• Volume of water

• Temperature of the reaction

• Mass of calcium carbonate

Why is it important to keep the mass of calcium carbonate constant in the experiment?

• To ensure the reaction produces more gas

• To prevent changes in the rate of reaction

• To increase the surface area of the reactants

• To decrease the reaction time

What is the purpose of plotting a graph of reaction rates against acid concentration?

• To find the exact amount of gas produced

• To determine the temperature at which the reaction occurs

• To visualize the relationship between concentration and reaction rate

• To measure the mass of reactants used

What conclusion can be drawn from the graph regarding the relationship between concentration and reaction rate?

• The rate of reaction is inversely proportional to concentration.

• The rate of reaction is not affected by concentration.

• The rate of reaction is proportional to the concentration of the acid.

• The rate of reaction decreases with increasing concentration.