STAAR Questions 8.11A, 8.11B

Front

What is the purpose of STAAR Questions 8.11A and 8.11B?

Back

To assess students' understanding of scientific concepts related to physical and chemical changes.

Front

Define physical change.

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

Give an example of a physical change.

Back

Melting ice into water.

Front

Define chemical change.

Back

A change that results in the formation of new chemical substances.

Front

Give an example of a chemical change.

Back

Burning wood to produce ash and smoke.

Front

What is the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed; it is conserved.

Front

How does temperature affect the rate of a chemical reaction?

Back

Increasing temperature generally increases the rate of a chemical reaction.

Front

What is an endothermic reaction?

Back

A reaction that absorbs energy from its surroundings, usually in the form of heat.

Front

What is an exothermic reaction?

Back

A reaction that releases energy to its surroundings, usually in the form of heat.

Front

What is a catalyst?

Back

A substance that increases the rate of a chemical reaction without being consumed in the process.