Intro to Balancing Chemical Equations

Which problem is balanced?
(Check ALL answers)

• PbO₂ + 2H₂

• SO₂ + H₂0 --> H₂SO₄

• 2Na + 2H₂O --> 2NaOH + H₂

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Is this balanced?
Al + O₂ → 2Al₂O₃

• Yes

• No

Tags

NGSS.MS-PS1-5

What is the part of the chemical equation in green called? 
Fe + S --> FeS

• products

• reactants

• yield

• chemical formula

Is this equation balanced?

• yes

• no

• Not enough information

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Balance this equation

_Al +_HCl --> _H₂ +_AlCl₃

• 2,6,3,2

• it's already balanced

• 4,12,3,4

• 2,1,4,5

Tags

NGSS.MS-PS1-5

The coefficient in 3H₂O is

• 6

• 5

• 2

• 3

Chemical Equation

• A representation of a chemical reaction

• the starting materials in a chemical reaction

• the new substances that are formed in a chemical reaction

• tells how many atoms, molecules, or formula units take part in a reaction

Tags

NGSS.MS-PS1-1

Is this equation balanced?

SO₃ + H₂O --> H₂SO₄

• yes

• no

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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