2024 7th Grade Science Midterm

Front

What is a dependent variable in an experiment?

Back

The dependent variable is the factor that is measured or observed in an experiment, which changes in response to the independent variable.

Tags

NGSS.MS-PS2-2

Front

What is a chemical change?

Back

A chemical change occurs when substances combine or break apart to form new substances, often accompanied by energy changes, color changes, or gas production.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

How can you identify a chemical reaction?

Back

You can identify a chemical reaction by observing the formation of new substances, which can be indicated by light emission, color change, gas bubbles, or the production of a precipitate.

Tags

NGSS.MS-PS1-2

Front

What are products in a chemical equation?

Back

Products are the substances that are formed as a result of a chemical reaction, found on the right side of a chemical equation.

Tags

NGSS.MS-PS1-5

Front

What happens to atoms during a chemical reaction?

Back

During a chemical reaction, atoms break apart and rearrange to form new substances.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is an independent variable in an experiment?

Back

The independent variable is the factor that is changed or controlled in an experiment to test its effects on the dependent variable.

Tags

NGSS.MS-PS2-2

Front

What is a physical change?

Back

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

Front

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

Back

A chemical change results in the formation of new substances, while a physical change does not change the chemical identity of a substance.

Tags

NGSS.MS-PS1-2

Front

What is an example of a chemical change?

Back

Cooking a cake is an example of a chemical change because it involves a chemical reaction that produces new substances.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is the role of energy in chemical reactions?

Back

Energy is often required to break bonds in reactants and is released when new bonds form in products, influencing the rate and direction of the reaction.

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-5