8.07: How to Balance Chemical Reactions

Multiple Choice

A substance produced during a chemical reaction

• Product

• Reactant

• Properties

Multiple Choice

A substance that takes part in and undergoes change during a reaction

• Product

• Molecule

• Reactant

Multiple Choice

A chemical reaction or process that releases heat.

• Endothermic

• Exothermic

Multiple Choice

What is the Law of Conservation of Mass?

• It states that matter cannot be created or destroyed.

• It states that energy cannot be created or destroyed.

• It states that matter can be created or destroyed.

• It states that sound can be created or destroyed.

Multiple Choice

What is the number before a chemical formula called?

Example: 2H₂ + O₂ ---> 2H₂O

• Coefficient

• Atom

• Subscript

• Equation

​2 (aq)

Multiple Choice

Is the following equation balanced?

Al + O₂ ---> 2Al₂O₃

• YES

• NO

Multiple Choice

Balance this equation:

H₂ + Cl₂ ---> HCl

• It is balanced.

• H₂ + Cl₂ ---> 2HCl

• 3H₂ + Cl₂ ---> 6HCl

• H₂ + 3Cl₂ ---> 6HCl

Multiple Choice

How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl₂ + H₂

• 1
• 2
• 3
• 4

Multiple Choice

Which number should go in the blank?
2 Na+ _ Cl₂ -> 2 NaCl

• 1
• 2
• 3
• 0

​Make sure to complete the Quizizz from yesterday! It is graded - the link is found under yesterday's announcements!