Balanced Eqns & Cons of Mass

The Law of Conservation of Mass tells us that the mass of all the REACTANTS must ______ the mass of all PRODUCTS in a chemical reaction.

• equal

• be greater than

• be less than

Tags

NGSS.MS-PS1-5

If reaction starts with 20g of reactants it should produce 

• a total of 40g of products
• a total of 10g of products
• a total of 80 g of products
• a total of 20g of products

Tags

NGSS.MS-PS1-5

In the reaction N₂ + 3H₂ → 2NH₃, how many hydrogen (H) atoms are there on the product side?

• 2

• 3

• 4

• 6

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-1

In the reaction 2Na + Cl₂ → 2NaCl, how many sodium (Na) atoms are there on the reactant side?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-5

Which of the following best describes a balanced chemical equation?

• The number of atoms of each element is the same on both sides of the equation.

• The number of atoms increases on the product side

• The number of atoms decreases as the reaction occurs

Tags

NGSS.MS-PS1-5

Which of the models of a chemical reaction best represents the Law of Conservation of Mass?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-5

Is the chemical equation following the Law of Conservation of Mass?

3 H₂ + N₂ → 2 NH₃

• Yes, it is following the Law

• No, it is not following the Law

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Which of the following equations does not demonstrate the law of conservation of mass?

• 2Na + Cl₂ ➡️ 2NaCl

• NaOH + HCl ➡️ NaCl + H₂0

• P₄ + 5O₂ ➡️ 2P₄O₁₀

Tags

NGSS.MS-PS1-5

Is the chemical equation following the Law of Conservation of Mass?

Na₂O + 2 CO₂ → 2 Na₂CO₃

• Yes, it is following the Law

• No, it is not following the Law

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Is this reaction balanced?

4Fe +3O₂ → 2Fe₂O₃

• yes

• no

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2