Balancing Equations Review

Balance the equation: Al + S --> Al₂S₃

• Al + 2S --> 2Al₂S₃

• 2Al + 3S --> Al₂S₃

What are reactants?

• The substances that begin the reaction (raw materials)

• What comes from the reaction

Is this equation balanced?

CS₂ + 2O₂ --> CO₂ +2SO₂

• Yes

• No

Tags

NGSS.MS-PS1-5

What is a coefficient?

• The small number on the right of the chemical symbol

• The large number to the left of a formula

What is a product?

• The raw materials

• A newly formed substance

Tags

NGSS.HS-PS1-6

Mg + ___ HCl → MgCl₂ + H₂

• 1

• 2

• 3

• 4

PCl₅  +  ___ H₂O  →  ___ HCl  +   H₃PO₄

• 4, 5
• 1, 6
• 3, 8
• 2,2

Is this equation balanced?

• Yes

• No

• Not enough information

Tags

NGSS.HS-PS1-7

Is this equation balanced?

• Yes

• No

• Not enough information

Tags

NGSS.HS-PS1-7

In the equation 2Mg + O₂ ---> 2MgO, which are the reactants?

• Mg and O

• MgO

• Mg and MgO

• O and MgO

Tags

NGSS.MS-PS1-2