Unit 3 Lesson 1

A change in appearance or form but does NOT create a new substance

• physical change

• reactant

• product

• chemical change

A change in the chemical identity of a substance, meaning a new substance is made

• physical change

• reactant

• product

• chemical change

Tags

NGSS.MS-PS1-2

The starting materials in a chemical reaction

• physical change

• reactant

• product

• chemical change

Tags

NGSS.MS-PS1-2

The substance or substances that are made in a chemical reaction

• physical change

• reactant

• product

• chemical change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The number of atoms at the start of a chemical reaction​ ​ (a)   at the end of the reaction.

• stays the same

• changes

Tags

NGSS.MS-PS1-5

Click the area that has the outputs of the "reaction."

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is NOT a usual sign of a chemical change.

• Change in color

• Bubbles/fizzing/gas being made

• Change in temperature

• Change in odor

• A substance changing state of matter

Tags

NGSS.MS-PS1-2

Click the area that has the inputs of the "reaction."

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The diagram shows the four layers of the atmosphere. Which layer is responsible for shielding Earth from ultraviolet radiation?

• Layer 1

• Layer 2

• Layer 3

• Layer 4

An astronomer studying planets outside our solar system has analyzed the atmospheres of four planets. Which of these planets' atmospheres would be most able to support a colony of humans?

• Planet A: 76% Nitrogen, 23% oxygen, 1% other gases

• Planet B: 82% Nitrogen, 11% Oxygen, 7% other gases

• Planet C: 78% Nitrogen, 1% Oxygen, 21% other gases

• Planet D: 27% Nitrogen, 3% Oxygen, 70% other gases

Tags

NGSS.MS-LS2-1