Counting Atoms and Balancing Equations and Conservation of Mass

How many Hydrogen are in 4H₂O + 2CH₄?

Tags

NGSS.MS-PS1-1

How many Magnesium are in 10MgCl₂?

• 10
• 5
• 20

Tags

NGSS.MS-PS1-1

How many O's are in Al₂(SO₄)₃

• 4
• 12
• 7
• 24

Number of N in (NH₄)₂CrO₄

• 1
• 2
• 8
• 16

Tags

NGSS.MS-PS1-1

What is a coefficient?

• The small number on the right of the chemical symbol.
• The large number to the left of a formula.

Tags

NGSS.MS-PS1-5

The subscripts usually represents what?

• How many of that specific element is included in the equation

• How many elements of that whole equation is included

• How many protons total

• how many electrons total

Tags

NGSS.MS-PS1-1

Is this equation balanced?

• yes
• no
• Not enough information

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Is the following equation balanced or unbalanced?
Fe + S --> FeS

• balanced
• unbalanced

Tags

NGSS.MS-PS1-5

How many different elements are present in H₂COCH₂

• 5

• 4

• 3

• 2

Tags

NGSS.MS-PS1-1

How many atoms in total: NaOH

Tags

NGSS.MS-PS1-1