Physical and 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 new chemical substances. It involves a chemical reaction and changes the molecular structure of the substance.

Front

What are some indicators of a chemical change?

Back

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

Front

Is melting ice a physical or chemical change?

Back

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

Front

Is rusting of iron a physical or chemical change?

Back

Rusting of iron is a chemical change because it involves a reaction with oxygen to form iron oxide.

Front

What happens during a chemical change?

Back

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

Front

What type of change occurs when a candle burns?

Back

A candle burning is a chemical change because it produces heat, light, and new substances such as carbon dioxide and water.

Front

What type of change occurs when an egg is fried?

Back

Frying an egg is a chemical change because it alters the proteins in the egg, resulting in a new substance.

Front

What type of change is an exploding firework?

Back

An exploding firework is a chemical change because it involves a rapid reaction that produces heat, light, and new chemical compounds.

Front

Is baking cookies a physical or chemical change?

Back

Baking cookies is a chemical change because it involves a reaction between ingredients that produces new substances.