Investigating Chemical Reactions: Types of Chemical Reactions

What is the primary characteristic of a synthesis reaction?

• Energy is released in the form of heat.

• A substance changes its state from solid to liquid.

• Two or more substances combine to form a complex substance.

• A single substance breaks down into simpler substances.

Which of the following is an example of a synthesis reaction?

• Carbon dioxide reacting with water to form carbonic acid.

• Leaves decomposing in a forest.

• Water decomposing into hydrogen and oxygen.

• Magnesium oxide breaking down into magnesium and oxygen.

What happens during a decomposition reaction?

• A gas is always produced.

• Two substances combine to form a new compound.

• A complex substance breaks down into simpler substances.

• Energy is absorbed from the surroundings.

Which reaction is the reverse of a synthesis reaction?

• Combustion reaction

• Decomposition reaction

• Displacement reaction

• Neutralization reaction

What are the products when hydrogen peroxide decomposes?

• Water and oxygen gas

• Carbon dioxide and water

• Hydrogen and carbon dioxide

• Magnesium and oxygen