DATE:
CHAPTER 4
NAME:
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