Chemical Reactions and Graphs Quiz

What happens to the reactants and products during a chemical reaction over time?

• Both reactants and products decrease

• Reactants increase, products decrease

• Both reactants and products increase

• Reactants decrease, products increase

How is the rate of reaction related to the graph of a chemical reaction?

• It is the inverse of the graph's gradient

• It is equal to the graph's gradient

• It is unrelated to the graph

• It is twice the graph's gradient

In the reaction between hydrochloric acid and marble, why does the graph of mass against time not touch the horizontal axis?

• Because the reaction is incomplete

• Because the graph is incorrect

• Because marble is in excess

• Because the reaction is too fast

What does a straight line on a graph of mass against time indicate about the reaction rate?

• The reaction rate is increasing

• The reaction rate is constant

• The reaction rate is decreasing

• The reaction has stopped

Why is the graph of carbon dioxide volume against time not a straight line?

• Because the graph is incorrectly drawn

• Because the reaction rate changes over time

• Because carbon dioxide is not a product

• Because the reaction rate is constant

What does a decreasing gradient on a graph indicate about the reaction rate?

• The reaction has stopped

• The reaction rate is decreasing

• The reaction rate is constant

• The reaction rate is increasing

When plotting the concentration of hydrochloric acid against time, what does it mean if the graph touches the horizontal axis?

• The reactant is in excess

• The reactant has been completely used up

• The reaction is incomplete

• The graph is incorrect

How does the concentration of calcium chloride change over time in a reaction?

• It increases over time

• It fluctuates randomly

• It remains constant

• It decreases over time

What is the significance of the gradient in a graph of reactants or products over time?

• It indicates the rate of reaction

• It is unrelated to the reaction

• It shows the total amount of reactants

• It represents the final product amount

What should you consider when sketching a graph of reactants against time?

• Whether the reactant is in excess

• The color of the reactant

• The temperature of the reaction

• The type of container used