Chemical Reactions Quiz

What type of chemical reaction involves two or more substances combining to form a new compound?

• Decomposition

• Synthesis

• Single displacement

• Double displacement

In a chemical reaction, if the concentration of reactants is increased, what generally happens to the reaction rate?

• It decreases

• It remains the same

• It increases

• It first increases, then decreases

According to the law of conservation of mass, in a chemical reaction, the mass of the reactants compared to the mass of the products is:

• Greater

• Less

• Equal

• Unpredictable without more information

• 18 u

• 17 u

• 9 u

• 34 u

• Synthesis

• Decomposition

• Single displacement

• Double displacement

The rate of a chemical reaction can be increased by all of the following EXCEPT:

• Increasing the temperature

• Decreasing the concentration of reactants

• Adding a catalyst

• Increasing the surface area of solid reactants

What is the purpose of balancing a chemical equation?

• To ensure that the reaction is physically possible

• To satisfy the law of conservation of mass

• To increase the reaction rate

• To identify the reactants and products

If a molecule has a molecular mass of 44 u and is composed of carbon and oxygen, with carbon having an atomic mass of 12 u, how many oxygen atoms does the molecule contain?

• 1

• 2

• 3

• 4

What type a reaction is taking place in this picture?

• Synthesis
• Decomposition
• Single Replacement
• Double Replacement