Chemical Reactions Vocabulary

What is the term for substances that undergo a chemical change in a reaction?

• Products

• Reactants

A substance that speeds up a chemical reaction without being used up in the process is called a:

• Reactant

• Catalyst

Which type of reaction occurs when a complex substance breaks down into simpler substances?

• Decomposition reaction

• Endothermic reaction

What term describes a chemical equation where the number of atoms is equal on both sides?

• Balanced equation

• Synthesis equation

In a chemical equation, what does the number placed in front of a chemical formula indicate?

• The temperature needed

• The coefficient

Which type of reaction releases energy in the form of heat and light when a substance combines with oxygen?

• Combustion

• Synthesis

What are the new substances formed as a result of a chemical reaction called?

• Products

• Coefficients

Which type of reaction describes two or more simple substances combining to form a more complex product?

• Decomposition reaction

• Synthesis reaction

In which type of reaction is energy absorbed from the surroundings?

• Endothermic reaction

• Synthesis reaction

Which type of reaction releases energy to the surroundings, usually in the form of heat?

• Exothermic reaction

• Synthesis reaction