Quiz 3: Chemical Reactions

What forms rust on a ship?

• Oxygen and carbon

• Iron and oxygen

• Iron and nitrogen

What does a chemical equation describe?

• Only the products of a reaction

• The identities of the molecules involved

• The temperature of the reaction

• The color change during the reaction

What are reactants in a chemical equation?

• Only gases involved

• Substances that undergo a change

• The same as products

• Substances formed as a result

What is the formula for water?

• H2O

• HO

• O2H

• H2O2

What do coefficients in a chemical equation indicate?

• The temperature of the reaction

• The number of particles involved

• The color of the reactants

• The speed of the reaction

What does the Law of Conservation of Mass state?

• Only gases are conserved

• Matter is neither created nor destroyed

• Matter can be created during a reaction

• Mass can change during a reaction

What type of reaction is photosynthesis?

• Replacement

• Decomposition

• Synthesis

• Combustion

What happens in a decomposition reaction?

• Compounds combine to form new substances

• Compounds break down into simpler products

• Energy is released

• Elements trade places

What is a synthesis reaction?

• A reaction that produces gas

• A reaction that combines elements or compounds

• A reaction that breaks down compounds

• A reaction that replaces one element with another

In a replacement reaction, what occurs?

• Two compounds combine

• A compound decomposes

• Energy is absorbed

• One element replaces another in a compound