Chapter 12 Matter: Properties and 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 property of all solids?

Back

In solids, particles are closely packed together and vibrate in place, maintaining a fixed shape and volume.

Front

How can you separate a sand-and-water mixture?

Back

You can separate a sand-and-water mixture by pouring it through a filter that allows only the water to pass through, leaving the sand behind.

Front

What causes a chemical reaction when cooking eggs?

Back

Heating the eggs in a pan causes a chemical reaction that changes the structure of the proteins in the eggs, resulting in scrambled eggs.

Front

What is density?

Back

Density is a physical property defined as mass per unit volume of a substance, often used to identify materials.

Front

What happens to the particles in a solid when it melts?

Back

When a solid melts, its particles gain energy, move more freely, and transition into a liquid state.

Front

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

Back

A physical change alters the form or appearance of a substance without changing its chemical composition, while a chemical change results in the formation of new substances.

Front

What is an example of a chemical change?

Back

An example of a chemical change is rusting iron, where iron reacts with oxygen to form iron oxide.

Front

What is the boiling point of water?

Back

The boiling point of water is 100 degrees Celsius (212 degrees Fahrenheit) at standard atmospheric pressure.

Front

What is an example of a mixture?

Back

An example of a mixture is sand and salt, where both substances retain their individual properties.