Year 8-9: Balancing Equations

Balance this equation:

MgCl₂ --> Mg+ Cl₂

• It's already balanced.

• 4MgCl₂ --> Mg₄+ 4Cl₂

• 4MgCl₂ --> Mg₄+ 5Cl₂

Tags

NGSS.MS-PS1-5

Balance this equation:
 2Li + Cl₂ -> LiCl

• 2Li + Cl₂ -> 4LiCl2
• 2Li + Cl₂ -> LiCl₂
• 2Li + Cl₂ -> 2LiCl

Tags

NGSS.MS-PS1-5

The substances listed on the left side of a chemical equation are the

• Products
• Coefficients
• Precipitates
• Reactants

In chemical reactions, what does the principle of conservation of mass mean?

• Atoms are not created or destroyed, just rearranged.

• The total mass of the reactants is greater than the total mass of the products.

• The total mass of the reactants is less than the total mass of the products.

• Products are the same as the reactants.

Tags

NGSS.MS-PS1-5

How many Hydrogen (H) atoms are in NH₃O₅

• 3

• 4

• 5

• 1

Tags

NGSS.MS-PS1-1

Name the part in red:

H₂ + O₂ -> H₂O

• Coefficient
• Product
• Reactant
• Subscript

Tags

NGSS.MS-PS1-1

Name the part in red:

H₂ + O₂ -> H₂O

• Coefficient

• Products

• Reactants

• Subscript

How many phosphorus atoms are in PO₄?

• 1
• 2
• 3
• 4

Tags

NGSS.MS-PS1-1

Which number should go in the blank?
_ H₂ + O₂ -> 2 H₂O

• 1
• 2
• 3
• 0

Tags

NGSS.MS-PS1-5

Is the following equation balanced or unbalanced ? 
Al + O₂ --> Al₂O₃

• Balanced
• Unbalanced

Tags

NGSS.MS-PS1-5