Chemical Reactions and Equations short answer Quiz

What are the four observations that help determine whether a chemical reaction has taken place?

• Change in state

• Change in color

• Evolution of gas

• Change in temperature

Define exothermic reaction and provide an example.

Write the word equation for the reaction between magnesium and oxygen.

What substance is formed when calcium oxide reacts with water?

Define a combination reaction and provide an example.

What is the common feature of exothermic reactions?

Define decomposition reaction. Give an example of a decomposition reaction.

In thermal decomposition, what causes the breakdown of reactants?

What is the product of the thermal decomposition of lead nitrate (Pb(NO3)2)?

What is double displacement? Provide an example of a double displacement reaction.