Chemical Changes and Reactions

What is chemistry?

• The study of living organisms.

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

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

• The science of numbers and their operations.

What defines a chemical change?

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

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

• A change in the physical state of matter, like ice melting into water.

• A change that only affects the appearance of a substance, not its composition.

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

• Change in color.

• Release of light.

• Change in shape.

• Release or absorption of heat.

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What happens to the cake batter when it is baked in the oven?

• It becomes a mixture that can be easily separated back into its original ingredients.

• It undergoes a physical change, but its chemical composition remains the same.

• It releases carbon dioxide gas, causing the cake to become fluffy.

• It gives off light and becomes colder.