Balancing and Classifying Reactions

To balance a chemical equation, it may be necessary to adjust the _____________.

• coefficient

• subscripts

• superscripts

• formulas of the compounds

Balance

Fe3O4 +H2 ---> Fe + H2O

• 2,4,3,2

• 1,4,3,4

• 2,2,2,2

• 1,2,3,4

Tags

NGSS.HS-PS1-7

The numbers that go before symbols and formulas in a chemical equation are _________.

• Superscripts

• Subscripts

• Catalysts

• Coefficients

A(n) _____________chemical equation has the same number of atoms of each element on each side of the equation.

• unbalanced

• balanced

• simple

• complex

Tags

NGSS.HS-PS1-7

Which set of coefficients will correctly balance the following chemical reactions?

• 1,2,1,2

• 2,1,2,1

• 1,2,1,1

• 2,1,1,1

Tags

NGSS.HS-PS1-7

How many HCl molecules do you need to balance this equation?

2Mg + ​ (a)   HCl ---> 2MgCl₅ + 5H₂

• 10

• 1

• 2

• 5

Tags

NGSS.HS-PS1-7

Is this equation balanced?

H₃PO₄ + KOH --> K₃PO₄ + H₂O

• yes

• no

Tags

NGSS.HS-PS1-7

Balance this reaction: ____ AlBr₃ + ____ K₂SO₄ ---> ____ KBr + ____ Al₂(SO₄)₃

• 1,1,1,1

• 2,3,6,1

• 2,6,1,1

• 3,1,2,2

Tags

NGSS.HS-PS1-7

Some students decomposed potassium chlorate powder into potassium chloride and oxygen gas. Which equation for this reaction is correctly balanced?

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

What is the right ratio of chemicals for the balanced chemical equation?

• 3,1 --> 2,3

• 3,2 --> 1,1

• 3,2 --> 2,4

• 3,2 --> 2,1

Tags

NGSS.HS-PS1-7