Chemistry Review

Front

What is a chemical reaction?

Back

A process where substances (reactants) change into different substances (products), often involving energy changes.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What evidence indicates a chemical reaction has occurred?

Back

Bubbles forming, color change, temperature change, or a new odor.

Tags

NGSS.MS-PS1-2

Front

What happens when a solid dissolves in a liquid?

Back

The solid breaks down into smaller particles and becomes part of the liquid, forming a solution.

Tags

NGSS.MS-PS1-2

Front

What is a saturated solution?

Back

A solution that cannot dissolve any more solute at a given temperature.

Front

How does heating a solution affect solubility?

Back

Heating usually increases the solubility of solids in liquids, allowing more solute to dissolve.

Tags

NGSS.MS-PS1-4

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

How do you calculate the mass of a solution?

Back

Add the mass of the solute to the mass of the solvent.

Front

What is the mass of 50 mL of water?

Back

50 g (since the density of water is 1 g/mL).

Front

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

Back

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

Tags

NGSS.MS-PS1-5

Front

What is a solute?

Back

A solute is a substance that is dissolved in a solvent to form a solution.