7th Grade MEGA Review - Units 1-3

Front

What is the principle of heat transfer?

Back

Heat always transfers from the hotter object to the cooler object in a system.

Front

What does it mean if a substance is soluble in water?

Back

It dissolves completely.

Front

What does it mean for a chemical equation to be balanced?

Back

A balanced equation has the same number of each type of atom on both sides.

Front

How can you determine the number of sulfur atoms in a molecule?

Back

Count the number of sulfur (S) symbols in the chemical formula.

Front

What happens to the particles of ice cream as it melts?

Back

The particles gain energy, move faster, and move farther apart.

Front

What is the definition of a solute?

Back

A solute is a substance that is dissolved in a solvent.

Front

What is the definition of a solvent?

Back

A solvent is a substance that dissolves a solute.

Front

What is thermal energy?

Back

Thermal energy is the total kinetic energy of particles in a substance.

Front

What is the law of conservation of energy?

Back

Energy cannot be created or destroyed, only transformed from one form to another.

Front

What is an endothermic reaction?

Back

An endothermic reaction absorbs heat from its surroundings.