Lessons on Balanced and Unbalanced Equations

Solve the problem: Al + S --> Al2S3

• Al + 2S --> 2Al2S3
• 2Al + 3S --> Al2S3

Tags

NGSS.HS-PS1-7

What is a reactant?

• The chemical substances that begin the reaction.
• What comes from the reaction.

Tags

NGSS.HS-PS1-7

Is this equation balanced?:                                                     CS₂ + 20₂ --> CO₂ +2SO₂

• Yes
• No

Tags

NGSS.HS-PS1-7

What is a coefficient?

• The small number on the right of the chemical symbol.
• The large number to the left of a formula.

Tags

NGSS.HS-PS1-7

What is a product?

• What's left of the chemical reaction.
• The beginning formulas.

Tags

NGSS.HS-PS1-6

 Mg  +  ___ HCl  →   MgCl₂  +   H₂

• 1
• 2
• 3
• 4

Tags

NGSS.HS-PS1-7

PCl₅  +  ___ H₂O  →  ___ HCl  +   H₃PO₄

• 4, 5
• 1, 6
• 3, 8
• 2,2

Tags

NGSS.HS-PS1-7

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

PCl₅  +  ___ H₂O  →  ___ HCl  +   H₃PO₄

• 4, 5
• 1, 6
• 3, 8
• 2,2

Tags

NGSS.HS-PS1-7