Chemical Reactions Balancing

Which equation is balanced?

• PbO₂ + 2H₂--> H₂SO₄

• SO₂ + H₂0 --> H₂SO₄

• 2Na + 2H₂O --> 2NaOH + H₂

• 2Na + 2H₂O --> 2NaOH + H

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Balance this equation:
P₄+O₂  -->  P₂O₃

• 3 P₄+ O₂ --> 2 P₂O₃

•  P₄+ O₂ --> 2 P₂O₃

•  P₄+ 3 O₂ --> 2 P₂O₃

•  P₄+ 2 O₂ --> 3 P₂O₃

Tags

NGSS.MS-PS1-5

What is a coefficient?

• The small number on the right of the chemical symbol.

• The large number to the left of a formula.

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NGSS.HS-PS1-7

Which side of a chemical equation is the product side?

• Left (before the arrow)

• Right (after the arrow)

Which side of a chemical equation is the reactant side?

• Left (before the arrow)

• Right (after the arrow)

What does the Law of Conservation of Mass state?

• Matter cannot be gained or lost in a chemical reaction.

• Matter can only be lost in a chemical reaction.

• Matter can only be gained in a chemical reaction.

• Matter can be gained and lost in a chemical reaction. 

Tags

NGSS.MS-PS1-5

Is this balanced?...
Fe + S --> FeS

• YES!

• NO!

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Fill in the blanks with coefficient:

PCl₅+_ H₂O→_ HCl+H₃PO₄

• 4, 5

• 1, 6

• 3, 8

• 2,2

Tags

NGSS.MS-PS1-5

4 grams of hydrogen and 32 grams of oxygen will combine to form water. What is the mass of the water formed?

• 36 grams

• 28 grams

• 32 grams

• 128 grams

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In a chemical reaction, 4 grams of sodium must combine with how many grams of chlorine to produce 10 grams of table salt?

• 4 grams

• 6 grams

• 8 grams

• 10 grams

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5