Chemistry, Day 7 - Grade 8

A physical change is:

• a change that does not alter the chemical composition of a substance

• a change that creates a new substance

• a change that always involves heat and light

• a change that cannot be reversed

Tags

NGSS.MS-PS1-2

A chemical change is:

• a process where a substance changes into a new substance with different properties

• a change in the state of matter without forming a new substance

• a process where only the shape or size of a substance changes

• a reversible change that does not alter the chemical composition

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

One physical change that occurs during digestion is:

• chewing food into smaller pieces

• breaking down proteins into amino acids

• absorbing nutrients into the bloodstream

• producing digestive enzymes

One chemical change that occurs during digestion is:

• the breakdown of starch into sugars

• the absorption of water into the bloodstream

• the movement of food through the esophagus

• the chewing of food into smaller pieces

Tags

NGSS.MS-PS1-2

NGSS.MS-LS1-7

Which actions represent chemical reactions?

• Decomposing matter

• Baking a cake

• Chewing food

• Forming steam from water

• Forming a precipitate

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Identify the type of change represented above AND explain what happens to the atoms during this change.

• The change is a chemical change; atoms are rearranged to form new substances.

• The change is a physical change; atoms remain in the same arrangement.

• The change is a nuclear change; atoms are split into smaller parts.

• The change is a phase change; atoms gain or lose energy but do not rearrange.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which statement accurately describes Substance A?

• Substance A is represented by the chemical formula CO2.

• Substance A is made of cobalt and oxygen.

• Substance A is represented by the chemical formula CO3.

• Substance A is made of one type of element.

Tags

NGSS.MS-PS1-1

Which statement accurately describes Substance B?

• Substance B is represented by the chemical formula CH.

• Substance B is made up of carbon and hydrogen.

• Substance B is represented by the chemical formula CH4.

• Substance B is made of one type of element.

Tags

NGSS.MS-PS1-1