Balancing Chemical Equations

What does the Law of Conservation of Mass say? It says,

"During a chemical reaction, mass is neither _______ or destroyed."

• burned

• created

• melted

Tags

NGSS.MS-PS1-5

The substances that go into a reaction are called the _______.

• products

• reactants

Tags

NGSS.MS-PS1-5

So, the Law of Conservation of Mass would tell us that the mass of all the REACTANTS must __________ the mass of all PRODUCTS in a chemical reaction.

• equal

• be greater than

• be less than

Tags

NGSS.MS-PS1-5

What coefficient should be used to make the following equation balanced?

N₂+O₂--> __?__NO

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-5

According to the Law of Conservation of Mass (Matter), Matter cannot be ​ (a)   or ​ (b)   , it can only be ​ (c)   . This means however many atoms of an element we have before a reaction must be ​ (d)   to the number after a reaction.

• created
• destroyed
• changed
• equal

Tags

NGSS.MS-PS1-5

What is the little number after an element in a chemical equation called.
Example: H₂

• Coefficient 

• Subscript

• Atom

• Equation

Which of the following equations are correctly balanced?

• 12CO₂ +H₂O --> C₆H₁₂O₆ + O₂

• CO₂ + 9H₂O --> C₆H₁₂O₆ + O₂

• CO₂ + H₂O --> 3C₆H₁₂O₆ + O₂

• 6CO₂ + 6H₂O --> C₆H₁₂O₆ + 6O₂

Tags

NGSS.MS-PS1-5

Is the following equation balanced?
4Fe + 3O₂ --> 2Fe₂O₃

• yes
• no

Tags

NGSS.MS-PS1-5

What is the right part of a chemical equation called...
2H_{2 +} O₂ --> 2H₂O

• Reactants
• Products 
• Yields 
• Chemical Equation 

Tags

NGSS.MS-PS1-5

How many elements are in C₆H₁₂O₆?

• 1
• 2
• 3
• 4

Tags

NGSS.MS-PS1-1