8th Grade Science STAAR Review

Front

What is the balanced chemical equation for the reaction of hydrogen and oxygen to form water?

Back

@@2H_2 + O_2 ightarrow 2H_2O@@

Front

What biome is characterized by low temperatures and low precipitation, primarily in the form of snow?

Back

Tundra

Front

What is a biotic factor in an ecosystem?

Back

Plants

Front

What is the basic unit of life in all living organisms?

Back

Cell

Front

How does increasing the concentration of reactants affect the rate of a chemical reaction?

Back

It increases the rate of reaction.

Front

What is the process by which plants make their own food using sunlight?

Back

Photosynthesis

Front

What is the term for a substance that speeds up a chemical reaction without being consumed?

Back

Catalyst

Front

What is the difference between an ecosystem and a biome?

Back

An ecosystem is a community of living organisms and their environment, while a biome is a large area characterized by specific climate and vegetation.

Front

What is the role of decomposers in an ecosystem?

Back

Decomposers break down dead organic matter, recycling nutrients back into the ecosystem.

Front

What is the formula for calculating density?

Back

Density = Mass/Volume