midterm exam staar released

Front

What is an indication that a chemical reaction has occurred?

Back

A solid forms when two clear solutions are mixed.

Tags

NGSS.MS-PS1-2

Front

What is the role of oxygen in chemical reactions?

Back

Oxygen and oxygen-containing compounds are involved in many different reactions.

Front

How does speed differ from velocity?

Back

Speed is a scalar quantity that refers to how fast an object is moving, while velocity is a vector quantity that includes both speed and direction.

Front

What factors affect ocean tides?

Back

The relative positions of the Sun, the Moon, and Earth affect ocean tides.

Tags

NGSS.MS-ESS1-1

Front

Why does the sun appear brighter than other stars?

Back

The sun is closer to Earth than any other star.

Front

What is a balanced chemical equation?

Back

A balanced chemical equation has the same number of each type of atom on both sides of the equation.

Tags

NGSS.MS-PS1-5

Front

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

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

Tags

NGSS.MS-PS1-4

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.

Tags

NGSS.MS-PS1-5

Front

What is an example of a chemical reaction?

Back

Rust forming on iron is an example of a chemical reaction.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is the significance of the atomic number?

Back

The atomic number indicates the number of protons in an atom and determines the element's identity.