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5
Chemical Reactions and Equations
(CHEMACTIVITY: Synthesis and Decomposition Reactions)
How do chemists describe, classify, and predict the products of chemical reactions?
2 – You Got It!
1 – Needs Some More Work!
0 - Incomplete
1. On your own…Read the short section on synthesis reactions on p. 267 and study the following
information:
REACTION
DESCRIPTION:
In these reactions, two different molecules or atoms combine to form a single
substance.
REACTION
FORMAT:
REACTION
GUIDELINES:
A + B → AB
1.
2.
3.
4.
Direct combination of two elements will produce a binary compound.
Metal oxides and carbon dioxide react to produce a metal carbonate (-CO3).
Metal oxides and water react to produce a metal hydroxide (-OH).
Nonmetal oxides and water react to produce an acid
2. In terms of reactants and products, describe how you would recognize a reaction as being a
synthesis reaction:
3. Predict the products of the following synthesis reactions, then balance each equation: (HINT: You
MUST write the correct formula for the product first!)
Ag + O2 →
BeO + CO2 →
P2O5 + H2O →
Al2O3 + H2O →
K2O + H2O →
SO3 + H2O →
BaO + CO2 →
Al + Cl2 →
4. On your own…Read the short section on decomposition reactions on p. 267 and study the
following information:
REACTION
DESCRIPTION:
During decomposition, one compound splits apart into two or more substances.
These substances can be elements or simpler compounds.
REACTION
FORMAT:
REACTION
GUIDELINES:
AB → A + B
1.
2.
3.
4.
Binary compounds break down into their component elements
Metal carbonates (-CO3) break down into a metal oxide and carbon dioxide.
Metal hydroxides (-OH) break down into a metal oxide and water
Acids break down into a nonmetal oxide and water
5. In terms of reactants and products, describe how you would recognize a reaction as being a
decomposition reaction:
6. Predict the products of the following decomposition reactions, then balance each equation: (HINT: You
MUST write the correct formulas for the two products first!)
Ag2O →
Cs2CO3 →
CuCO3 →
Al(OH)3 →
Fe(OH)3 →
H2SO4 →
ZnCO3 →
RaCl2 →
7. How would you describe the comparison between synthesis and decomposition:
Essential Content and Skills:
How do you correctly identify, balance and predict the product(s) of synthesis reactions?
How do you correctly identify, balance and predict the product(s) of decomposition reactions?