Chemical Reactions Unit Review

Finish the sentence with the statement that is always true: in a chemical reaction...

• an explosion occurs

• a new substance is formed

• the state of matter changes

• gases are produced

Tags

NGSS.MS-PS1-2

The Law of Conservation of Mass says that mass can neither be __________ or __________.

• created; destroyed

• recycled; renewed

• subtracted; added

• joined; separated

Tags

NGSS.MS-PS1-5

Is there ever a time where conservation of mass is NOT observed?

• Yes

• No

Tags

NGSS.MS-PS1-5

A solid weighing 25 g is mixed with 60 g of a solution. A chemical reaction takes place and a gas is produced. The final mass of the mixture is 75 g. What is the mass of the gas released?

• 15g

• 10g

• There is no way to measure this.

• 75g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

• 2

• 3

• 5

• 6

Tags

NGSS.MS-PS1-5

Balance this equation:
MgCl₂ --> Mg₄+ Cl₂

• It's already balanced.
• 4MgCl₂ --> Mg₄+ 4Cl₂
• 4MgCl₂ --> Mg₄+ 5Cl₂

Tags

NGSS.MS-PS1-5

Is the following reaction balanced?

(AQ 1, 2)

• Yes

• N0

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Wood burning: physical or chemical?

• Physical

• Chemical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Sharpening a pencil: physical or chemical?

• Physical

• Chemical

Erosion (river carving a canyon): physical or chemical?

• Physical

• Chemical