Balance Chemical Reactions Review

In a chemical equation, is it true that

• the reactant side and product side can have different numbers of atoms for each element

• there can be different elements on the reactant side and the product side

• the coefficients indicate the number of compounds of each reactant used and the number of compounds of each product made

Tags

NGSS.HS-PS1-7

The reactants are on the left side of the chemical equation.

• True

• False

How many atoms TOTAL are in a molecule of serotonin?

C₁₀H₁₂N₂O

• 22

• 24

• 25

• 4

In the reaction,

2Mg + O₂ → 2MgO, which are the reactants?

• Mg and O₂

• MgO

• Mg and MgO

• O₂ and MgO

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

Balance this equation:

H₂ + N₂ → NH₃

• H₂ + 4N₂ → NH₃

• H₂ + 3N₂ → 2NH₃

• 3H₂ + N₂ → 2NH₃

• 2H₂ + 2N₂ → 2NH₃

Balance this reaction:

___ HCN + ___ CuSO₄ → ___ H₂SO₄ + ___ Cu(CN)₂

• 2:1:1:2

• 2:1:1:1

• 1:2:2:1

• 1:2:1:1

Tags

NGSS.HS-PS1-7

Balance this reaction:

___ RbNO₃ + ___ BeF₂ → ___ Be(NO₃)₂ + ___ RbF

• 1:1:1:1

• 1:2:1:1

• 2:1:1:2

• 2:1:2:1

Tags

NGSS.HS-PS1-7

Balance the following reaction:

__Na + __Cl₂ → __NaCl

• 1:1:2

• 2:1:2

• 2:1:1

• 1:1:1

Tags

NGSS.HS-PS1-7

The products are on the left side of the chemical equation.

• True

• False

In the reaction,

2Mg + O₂ → 2MgO, which are the products?

• Mg and O₂

• MgO

• Mg and MgO

• O₂ and MgO