1. UNIT 6 Chemical Equations
Grade:
10-12
Subject:
Chemistry
Date:
Winter ???

2. Balancing Chemical Equations
UNIT 6
Balancing Chemical Equations
ABClark-Grubb

3. All chemical reactions
have two parts
Reactants - the substances you begin with
Products - the substances produced from the reactants
Reactants → Products

4. Which of the following substances in the reaction below are reactants?1
Which of the following substances in the reaction below are reactants?
PbCl2 + AgNO3 Pb(NO3)2 + AgCl A
PbCl2 B
AgNO3 C
Pb(NO3)2 D
AgCl

5. 2
Which of the following substances in the reaction below are products?
H2CO3 CO2 + H2O A
H2CO3 B
CO2 C
H2O

6. A chemical reaction a. Atoms are joined in new ways
b. Atoms are not created or destroyed.
Can be described in three common ways  
1. As a sentence
  2. As a word equation
  3. As a formula equation
Copper reacts with chlorine to form copper (II) chloride.
Pull
copper + chlorine copper (II) chloride
Pull
Pull
Cu + Cl CuCl2

7. Symbols used in Equations
Refer to Table 11-1 p.323
the arrow separates the reactants from the products. It reads: “yields”or "produces"
plus sign - “and” “combines with” “ reacts with”
(s ) after the formula –solid
(g ) –gas
( l ) –liquid
(aq) - dissolved in water, aqueous solution.

8. 3
What does the (g) symbol mean after a formula?

9. 4
What does the (aq) mean after a formula?

10. MORE Symbols used in Equations
indicates a reversible reaction 
(More later)
shows that heat is 
supplied to the reaction
is used to indicate the use of a 
catalyst, in this case, platinum.

11. What is a catalyst?
A substance that speeds up a reaction without being changed by the reaction.

12. Skeleton Equation (unbalanced)
Uses formulas and symbols to describe a 
 reaction
Doesn’t indicate how many of each reactant 
 and product.

13. ANY QUESTIONS?