Balancing Chemical Equations

What is the little number after an element in a chemical equation called?

Example: H₂

• Coefficient

• Atom

• Subscript

• Equation

What is the number before a chemical formula called?

Example: 2H₂ + O₂ ---> 2H₂O

• Coefficient

• Atom

• Subscript

• Equation

In the equation, 2Mg + O₂ ---> 2MgO, which are the REACTANTS?

• Mg and O

• Mg and MgO

• MgO

• O and MgO

Tags

NGSS.MS-PS1-2

Is this equation balanced?

N₂ + O₂ --> N₂O₂

• No

• Yes

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Is this equation balanced?

• Yes

• No

Tags

NGSS.MS-PS1-5

What is the left part of a chemical equation called?

2H₂ + O₂ ---> 2H₂O

• Reactants

• Yields

• Products

• Chemical equation

Tags

NGSS.MS-PS1-5

What is the right part of a chemical equation called?

2H₂ + O₂ ---> 2H₂O

• Reactants

• Yields

• Products

• Chemical Equation

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

• yes

• no

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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

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