Revision Chemisrty Chapter 5

Which of the following results in a chemical change in matter?

• burning wood

• boiling water

• bending a straw

A solid that forms from liquids in a chemical reaction is called a precicpitate

• True

• False

How can you balance a chemical equation?

• change the coefficients

• change the subscript

• change the products

• change the reactants

In a closed system, atter can enter from or escape to the surroundings

• True

• False

In general, what happens when you increase the temperature of a reaction?

• The heat destroys the reactants

• the rate of the reaction increases

• the rate of the reaction decreases

All reactions need the following to get started

• activation energy

• catalyst

• inhibitor

At the end of exothermic reaction, the products have less energy than the reactants.

• True

• False

the biological catalysts in your body

• enzymes

• inhibitor

• indicator

Substances that undergo the chemical reaction are called:

• reactants

• products

• catalysts

A way to show a chemical reaction, using symbols instead of words.

• chemical equation

• chemical formula

• chemical symbol