STAAR Matter Spiral Review - Check for Understanding

Front

What are physical properties of matter?

Back

Physical properties are characteristics of matter that can be observed or measured without changing the substance's identity, such as color, density, and state (solid, liquid, gas).

Front

What is a conductor?

Back

A conductor is a material that allows heat and electricity to move easily through it, such as metals like copper and aluminum.

Front

What is an insulator?

Back

An insulator is a material that does not allow heat and electricity to pass through easily, such as rubber, wood, and plastic.

Front

Why do metals conduct thermal energy and electricity?

Back

Metals have free electrons that can move easily, allowing them to transfer energy efficiently.

Front

What happens to the temperature of a substance when it changes state?

Back

The temperature of a substance changes when it changes state; for example, ice melts to water at 0°C.

Front

What is density?

Back

Density is the mass of an object divided by its volume, often expressed in grams per cubic centimeter (g/cm³).

Front

What is the significance of a material's density in determining if it will float or sink in water?

Back

If a material's density is less than that of water (1 g/cm³), it will float; if it is greater, it will sink.

Front

What is the boiling point of water?

Back

The boiling point of water is 100°C (212°F) at sea level.

Front

What is the freezing point of water?

Back

The freezing point of water is 0°C (32°F) at sea level.

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, such as melting or freezing.