9/34 Conservation of Mass Practice

How many Nitrogen (N) atoms are in 4NH₃?

• 4

• 1

• 3

• 12

Tags

NGSS.MS-PS1-1

In the equation shown, what are the reactant(s)?

• N₂ + H₂

• NH₃

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The Coefficient (3) in the Chemical Formula, 3H₂O, tells you how many _____________ there are.

• Atoms of Hydrogen

• Atoms of Oxygen

• Atoms of Water

• Molecules of Water

How many oxygen atoms are in this chemical formula?

• 6 oxygen atoms

• 2 oxygen atoms

• 3 oxygen atoms

• 4 oxygen atoms

Tags

NGSS.MS-PS1-1

If a reaction starts with a total 75g of reactants it should produce 

• a total of 40g of products
• a total of 75g of products
• a total of 180 g of products
• None of the above

Tags

NGSS.MS-PS1-5

How many different elements does PbNO₃ have?

• 2
• 3
• 4
• 5

Tags

NGSS.MS-PS1-1

For the equation:
2H₂ +  O₂ --> 2H₂O
How much H₂O will be produced if we react 4g of H₂ and 32g of O₂?

• 4g
• 32g
• 36g
• 28g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What happens to the total mass of the substances after a chemical reaction?

• It decreases.

• It increases.

•  It remains the same.

• It increases then decreases.

Tags

NGSS.MS-PS1-5

How many atoms do you have in the compound 2MgCl₂?

• 2 atoms

• 4 atoms

• 6 atoms

• 8 atoms

Tags

NGSS.MS-PS1-1

How many oxygen atoms in TOTAL make up the chemical equation below?

6 CO₂ + 6 H₂O → C₆H₁₂O₆ + 6 O₂

• 18 atoms total

• 6 atoms total

• 36 atoms total

• 2 atoms total

Tags

NGSS.MS-PS1-1