Download Types of Reactions and Balancing Chemical Equations Review Sheet

Types of Reactions and Balancing Chemical Equations Review Sheet
1. Definitions:
a. Reactant – the substances that exist before the reaction takes place; found on the
left side of the equation
b. Product – the substances that exist after the reaction takes place; found on the right
side of the equation
c. Yield sign – the arrow that separates the reactants from the products
d. Coefficient – numbers written in front of a compound to balance an equation
e. Subscript – numbers written in chemical formulas that indicate the number of atoms
2. Balance the following:
_2_H2 + _1_O2  _2_H2O
_2_Fe + _3_CuSO4  _1_Fe2(SO4)3 + _3_Cu
_1_C5H12 + _8_O2  _5_CO2 + _6_H2O
_1_AgNO3 + _1_KCl  _1_AgCl + _1_KNO3
_2_HgO  _2_Hg + _1_O2
3. What type of reaction is the following: H2 + O2  H2O _____synthesis______
4. What type of reaction is the following: Fe + CuSO4  Fe2(SO4)3 + Cu: single replacement
5. What type of reaction is the following: C5H12 + O2  CO2 + H2O ______combustion______
6. What type of reaction is the following: AgNO3 + KCl  AgCl +KNO3 double replacement
7. What type of reaction is the following: HgO  Hg + O2 ____decomposition______
8. What are the 3 main products in a combustion reaction?
_____water_____, _____carbon dioxide_____ & _______heat_____
9. Which of the following is a chemical formula for the compound formed between calcium
and chlorine?
a. CaCl
c. Calcium Chloride
b. Calcium Dichloride
d. CaCl2
10. What do coefficients tell you about a chemical formula? the number of formula units of
the compound
11. What do subscripts tell you in a chemical formula? The number of atoms in the formula
12. Label the following reaction with these words: reactants, products, coefficient, subscript,
yield sign, and catalyst.
13. What is the law of conservation of mass? Matter can’t be created or destroyed
14. For the equation 2H2 + O2  2H2O, according to the law of conservation of mass, is it
possible for the water to have a greater mass than the combined mass of the two gases?
_NO_. Why? Mass always has to be conserved
15. Balance the following and identify the type of reactions:
4 P + 5 O2  1 P4O10
synthesis
1 Zn + 2 HCl  1 ZnCl2 + 1 H2
single replacement
2 Mg + 1 O2  2 MgO
synthesis
4 FeS + 7 O2  2 Fe2O3 + 4 SO2
OMIT
1 C3H8 + 5 O2  3 CO2 + 4 H2O
combustion
4 KClO3 3 KClO4 + 1 KCl
decomposition
2 Al(OH)3 + 3 H2SO4  1 Al2(SO4)3 + 6 H2O
double replacement
2 Al + 3 FeO 1 Al2O3 + 3 Fe
single replacement
2 C2H3Cl + 5 O2  4 CO2 + 2 H2O + 2 HCl
OMIT
4 Si + 1 S8  2 Si2S4
synthesis