PHET: Phase Change LAB

Front

What is the definition of temperature in the context of phase changes?

Back

Temperature is a measure of the average kinetic energy of the particles in a substance, influencing the state of matter (solid, liquid, gas).

Front

What are the units commonly used to measure temperature?

Back

Common units for measuring temperature include degrees Celsius (°C), Kelvin (K), and degrees Fahrenheit (°F).

Front

What is the boiling point of water in degrees Celsius?

Back

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

Front

What is the freezing point of water in degrees Celsius?

Back

The freezing point of water is 0 degrees Celsius (°C) at standard atmospheric pressure.

Front

What happens to the molecules of a substance as it heats up?

Back

As a substance heats up, its molecules gain kinetic energy, move faster, and may change from solid to liquid or liquid to gas.

Front

What is the difference between atoms and molecules?

Back

Atoms are the basic building blocks of matter, while molecules are formed when two or more atoms bond together.

Front

Identify the following as atoms or molecules: H2O, O, CO2.

Back

H2O and CO2 are molecules; O is an atom.

Front

What is the significance of the Kelvin scale in scientific measurements?

Back

The Kelvin scale is significant because it starts at absolute zero, the point at which all molecular motion stops, making it useful for scientific calculations.

Front

What phase change occurs when a solid turns into a liquid?

Back

The phase change that occurs when a solid turns into a liquid is called melting.

Front

What phase change occurs when a liquid turns into a gas?

Back

The phase change that occurs when a liquid turns into a gas is called evaporation or boiling.