Physical vs. Chemical Changes

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include melting, freezing, and dissolving.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of one or more new substances with different properties. Examples include rusting, burning, and cooking.

Front

What is the difference between qualitative and quantitative observations?

Back

Qualitative observations describe characteristics or qualities (e.g., color, texture), while quantitative observations involve measurements and numbers (e.g., height, weight).

Front

Is melting ice a physical or chemical change?

Back

Melting ice is a physical change because it changes from solid to liquid without changing its chemical composition.

Front

Is burning wood a physical or chemical change?

Back

Burning wood is a chemical change because it produces new substances, such as ash and smoke.

Front

What happens during a chemical change?

Back

During a chemical change, the bonds between atoms are broken and new bonds are formed, resulting in new substances.

Front

What is an example of a physical change?

Back

An example of a physical change is chopping wood, where the wood's physical form changes but its chemical composition remains the same.

Front

What is an example of a chemical change?

Back

An example of a chemical change is baking a cake, where ingredients react to form a new substance.

Front

How can you tell if a chemical change has occurred?

Back

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

Front

What is dissolving salt in water an example of?

Back

Dissolving salt in water is an example of a physical change because the salt can be recovered by evaporating the water.