Chemical Changes

What is chemistry?

• The study of living organisms.

• The science of different kinds of matter and how that matter can change.

• The study of the Earth's physical structure and substance.

• The branch of science concerned with the properties and phenomena of light.

What is a mixture?

• A single, pure substance.

• Anything made by combining two or more different things.

• A substance that cannot be separated into simpler substances.

• A substance that changes its state of matter.

What defines a chemical change?

• A change where substances are mixed but can be easily separated.

• A change that occurs when the particles that make up two or more substances are rearranged to form a new substance.

• A change in the physical state of a substance, like melting ice.

• A change that only alters the appearance of a substance.

Which of the following is NOT typically an evidence of a chemical change?

• A change in color.

• The release of light or gases.

• A change in the shape of an object.

• Giving off or taking in heat.

Why is baking a cake considered a chemical change?

• Because the ingredients are simply mixed together.

• Because the cake can be easily separated back into flour, sugar, and eggs.

• Because new substances are formed that cannot be easily undone, and there are changes in color, smell, and gas release.

• Because it only involves a change in temperature.