Chemical Reactions (2024)

Which of the following is QUANTITATIVE data?

• It looks white

• soft

• 37 deg C

• soluble in water

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-1

Which substance is composed of only one type of atom?

• Water

• Silver

• Salt

• Carbon Dioxide

When two oxygen atoms combine to form O₂, they form a

• atom

• compound

• molecule

• liquid

Tags

NGSS.MS-PS1-1

Which of the following is a QUALITATIVE observation

• The apple turned brown

• It is 20 deg C outside

• I need 5 ml of HCl

• There were 3 red m&ms

What has to happen to be sure that a chemical reaction occurred?

• The object changed shape

• The substance changed phases (states of matter)

• The substance became a new substance

• The substance became smaller

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Water condensing from a gas to a liquid is an example of what type of change?

• Physical

• Chemical

Tags

NGSS.MS-PS1-4

Check all of the factors that increased the rate of the Alka Seltzer reaction.

• Decrease temperature of the water

• Increase surface area (crush the tablet)

• Increase the temperature of the water

• Leave the tablet whole

Tags

NGSS.MS-PS3-4

When you put aluminum foil into the blue copper chloride, what was a sign that a chemical reaction occurred?

• The temperature increased?

• A color change

• A gas formed

Tags

NGSS.MS-PS1-2

When a piece of bread is toasted, a chemical reaction occurred.

• True

• False

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What type of change are phase changes (changes in state of matter)?

• Chemical

• Physical

• Neither of these

Tags

NGSS.MS-PS3-4

NGSS.MS-PS1-4