Unit 8 Review

Balance this equation-
__P₄ + __O₂ --> __P₂O₃

• it is already balanced
• 2, 1, 3
• 1, 2, 3
• 1, 3, 2

Tags

NGSS.HS-PS1-7

What does the Law of Conservation of Mass state?

• Matter cannot be gained or lost in a chemical reaction.
• Matter can only be lost in a chemical reaction.
• Matter can only be gained in a chemical reaction.
• Matter can be gained and lost in a chemical reaction. 

Tags

NGSS.HS-PS1-7

What is the little number after an element in a chemical equation called.
Example: H₂

• Coefficient 
• Subscript
• Atom
• Equation

When balancing equations a ____ can be placed to the left of a formula of a substance to make the equations balanced

• charge
• subscript
• random number
• coefficient

How many atoms of aluminum are on each side of the following equation: 4Al + 3O₂ --> 2Al₂ O₃

• 2
• 6
• 1
• 4

Tags

NGSS.HS-PS1-7

How many IRON atoms are in this chemical formula?

• 4 iron atoms

• 2 iron atoms

• 8 iron atoms

• 3 iron atoms

Tags

NGSS.MS-PS1-1

Does this follow the law of conservation of mass:

Yes No

• Yes

• No

Tags

NGSS.HS-PS1-7

Does this follow the law of conservation of mass:

Yes No

• Yes

• No

Tags

NGSS.HS-PS1-7

The compound with a pink square is known as a ___.

• Reactant

• Product

Tags

NGSS.HS-PS1-7

Which type of reaction is shown?

• Combustion

• single displacement

• double displacement

• decomposition