Counting Atoms, Heat transfer, and Ph/CH changes Review

Front

What is a chemical change?

Back

A process where one or more new substances are created, altering the identity of the original substance.

Front

What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical identity.

Front

What is the main difference between a chemical change and a physical change?

Back

Chemical changes alter the substance's identity; physical changes do not.

Front

How many aluminum atoms are in Al₂O₃?

Back

2

Front

What happens to ice cubes when they melt in a glass of water?

Back

Heat is transferred from the warmer water to the ice cubes.

Front

What is heat transfer?

Back

The movement of thermal energy from one object or substance to another.

Front

What is an example of a physical change?

Back

Melting ice, boiling water, or dissolving sugar in water.

Front

What is an example of a chemical change?

Back

Rusting iron, burning wood, or baking a cake.

Front

What is the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed; it is conserved.

Front

What is an atom?

Back

The smallest unit of an element that retains the properties of that element.