7th Grade Honors Science 1st Semester Review

Front

What does a graph showing constant speed look like?

Back

A straight line on a distance-time graph indicates constant speed.

Front

What is evidence of a chemical reaction?

Back

Change in color and production of gas bubbles are evidence of a chemical reaction.

Front

What should you do to dissolve more sugar in water?

Back

You should stir the water.

Front

How can you make a solution more concentrated?

Back

By adding more solute.

Front

What do we call substances that are not mixtures?

Back

Pure substances.

Front

What is a solute?

Back

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

Front

What is a solvent?

Back

A solvent is a substance that dissolves a solute, forming a solution.

Front

What is the difference between a compound and an element?

Back

A compound is made of two or more elements chemically combined, while an element is a pure substance that cannot be broken down.

Front

What is an endothermic reaction?

Back

An endothermic reaction is a chemical reaction that absorbs heat from its surroundings.

Front

What does it mean for a substance to be pure?

Back

A pure substance has a uniform and definite composition.