Chemical Equations & Balancing

Multiple Choice

A change in which NEW substances are formed.

• Chemical change

• Physical change

• Casual change

• Formal change

Multiple Choice

Which observations prove a chemical change occurred ?

• Dissolving and expected color change

• Mixing and dissolving

• State of matter change and boiling water bubbles

• Unexpected color change and temperature change

Multiple Choice

When writing a chemical equation, reactants are on the _____________ while products are on the _________________.

• top, bottom

• right, left

• left, right

• bottom, top

Multiple Choice

Indicate below which elements exist as diatomic molecules

• phosphorus

• potassium

• fluorine

• fluorine, phosphorus, and potassium

Multiple Choice

What are the smaller numbers that you CANNOT change in a chemical equation? 

• Coefficient

• Products

• Reactants

• Subscript

Multiple Choice

What are the larger numbers that you CAN CHANGE in a chemical equation? 

• Coefficient 

• Products

• Reactants

• Subscripts

Multiple Choice

What is the Law of Conservation of Mass?

• It states that no matter can be created or destroyed.

• It states that no energy can be created or destroyed.

• It states that matter can be created or destroyed.

• It states that no sound can be created or destroyed.

Multiple Choice

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

• 1

• 2

• 3

• 4

Multiple Choice

Is this balanced?
Al + O₂ → 2Al₂O₃

• Yes

• No