7th Grade MEGA Review - Units 1-3

Front

What is conduction?

Back

Conduction is the transfer of heat through direct contact between materials. It occurs when faster-moving molecules collide with slower-moving ones, transferring energy.

Front

What is convection?

Back

Convection is the transfer of heat through the movement of fluids (liquids or gases). It occurs when warmer, less dense areas of a fluid rise and cooler, denser areas sink.

Front

What is radiation?

Back

Radiation is the transfer of heat in the form of electromagnetic waves. It does not require a medium to travel through, allowing heat to be transferred through empty space.

Front

What state of matter has the highest kinetic energy?

Back

Gas has the highest kinetic energy because its molecules are moving rapidly and are far apart compared to solids and liquids.

Front

What is precipitation?

Back

Precipitation is any form of water that falls from the atmosphere to the ground, including rain, snow, sleet, and hail.

Front

What is the relationship between temperature and kinetic energy?

Back

As temperature increases, the kinetic energy of molecules also increases, causing them to move faster.

Front

What is the difference between solids, liquids, and gases in terms of molecular arrangement?

Back

In solids, molecules are tightly packed in a fixed arrangement. In liquids, molecules are close but can move past each other. In gases, molecules are far apart and move freely.

Front

What happens to the molecules in a substance when it is heated?

Back

When a substance is heated, its molecules gain energy, move faster, and may change state (e.g., from solid to liquid or liquid to gas).

Front

What is the process of evaporation?

Back

Evaporation is the process by which molecules at the surface of a liquid gain enough energy to enter the gas phase.

Front

What is condensation?

Back

Condensation is the process by which gas molecules lose energy and transition into the liquid state, often forming droplets.