Law of Conservation of Mass (week 1)

If a reaction starts with a total 54g of reactants it should produce 

• a total of 40g of products
• a total of 54g of products

• a total of 180 g of products
• None of the above

Tags

NGSS.MS-PS1-5

O + H₂ → H₂O

32 g of Oxygen completely reacts with 8 g of Hydrogen to produce _____ g of water.

• 8

• 12

• 24

• 40

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Mg + F → MgF

24 g of magnesium reacts with 38 g of fluorine to produce _____ g magnesium fluoride.

• 62 
• 38
• 24
• 14

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

How many elements does PbNO₇ have?

Hint: Every capital letter😉

• 2
• 3
• 4
• 5

Tags

NGSS.MS-PS1-1

How many nitrogen atoms does NH₃ have?

• 1
• 2
• 3
• 4

Tags

NGSS.MS-PS1-1

Substances present at the start of a chemical reaction are called ____.

• subscripts
• coefficients
• reactants
• products

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Substances that form as the result, or at the end, of a chemical reaction are called ____.

• products
• reactants
• coefficients
• subscripts

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

How many iron (Fe) atoms are in 
Fe(NO₃)₂

• 1
• 2
• 3
• 6

Tags

NGSS.MS-PS1-1

How many nitrogen (N) atoms are in 
Fe(NO₃)₂

• 1
• 2
• 3
• 6

Tags

NGSS.MS-PS1-1

How many oxygen (O) atoms are in 
Fe(NO₃)₂

• 1
• 2
• 3
• 6

Tags

NGSS.MS-PS1-1