Date: Name: Class: chapter 4 Balancing Chemical Equations BLM 4

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DATE:

CHAPTER 4

NAME:

Balancing Chemical Equations

Goal •

To balance chemical equations.

CLASS:

BLM 4-15

Tips For Balancing Equations

• HOFBrINCl the clown reminds us which elements exist as diatomic molecules.

• Balance compounds first and single elements last.

• Balance hydrogen and oxygen last. They often appear in more than one reactant or more than one product, so they are easier to balance after the other elements are balanced.

• If a polyatomic ion appears in both a reactant and a product, think of it as a single unit to balance the equation faster.

• Once you think the equation is balanced, do a final check by counting the atoms of each element one more time.

Balance the equations

1. a. ____ H

2

+ ____ Cl

2

→ ____ HCl b. ____ K + ____ MgCl

2

→ ____ Mg + ____ KCl c. ____ HCl + ____ Ca(OH)

2

→ ____ CaCl

2

+ ____ H

2

0 d. ____ Na

3

PO

4

+ ____ FeCl

3

→ ____ NaCl + ____ FePO

4 e. ____ K

3

PO

4

+ ____ HCl → ____ KCl + ____ H

3

PO

4 f. ____ CaF

2

+ ____ NaCl → ____ CaCl

2

+ ____ NaF

2. Change the following word equations into skeleton equations, then balance them. a. Hydrogen + oxygen → water

_______________________________________________________________________________ b. Lithium fluoride + chlorine → lithium chloride + fluorine

_______________________________________________________________________________ c. Lead(IV) iodide + hydrochloric acid → hydroiodic acid + lead(IV) chloride

_______________________________________________________________________________ d. Lithium carbonate + copper(II) nitrate → lithium nitrate + copper(II) carbonate

_______________________________________________________________________________ e. Hydrofluoric acid + potassium hydroxide → potassium fluoride + water

_______________________________________________________________________________ f. Ammonium carbonate and magnesium sulfate → ammonium sulfate + magnesium carbonate

_______________________________________________________________________________

ON Science 10 Blackline Masters

BLM 4-15 Balancing Chemical Equations

Copyright © 2010 McGraw-Hill Ryerson Limited

978-0-07-031859-5

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