Chemical vs. Physical Changes

Front

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

Back

A chemical change results in the formation of new substances with different properties, while a physical change does not alter the chemical composition of a substance.

Front

What is an example of a physical change?

Back

Mixing air into egg whites is an example of a physical change.

Front

What is an example of a chemical change?

Back

Burning wood is an example of a chemical change.

Front

How can you identify a chemical change?

Back

Indicators of a chemical change include color change, gas production, temperature change, and the formation of a precipitate.

Front

What happens to the gas produced in a chemical reaction?

Back

The gas may escape into the atmosphere or be captured for further analysis.

Front

What is the significance of the flame test in identifying gases?

Back

The flame test is used to identify the presence of specific gases, such as hydrogen, by observing the characteristics of the flame.

Front

Why does a candle go out when carbon dioxide is produced?

Back

A candle goes out when carbon dioxide accumulates because it displaces oxygen, which is necessary for combustion.

Front

What is the role of oxygen in combustion?

Back

Oxygen is a reactant in combustion reactions, allowing substances to burn and produce heat and light.

Front

What is the law of conservation of mass in relation to chemical changes?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

Front

What are some common indicators of a physical change?

Back

Common indicators of a physical change include changes in state (solid, liquid, gas), shape, and size without altering the substance's chemical composition.