Name:_____________________________________________Period______Date_________________
Quiz: Unit 6A—Chemical Reactions
MnO2
1. Label the parts of this equation (4pts):
A.
Catalyst
B. Coefficient
2H2O2 2H2O + O2
C. Superscript
D. Subscript
E. Yields or Produces
2. Which greenhouse gas is produced from the combustion of fossil fuels (hint: also the gas
released when hydrocarbons are burned) (1pt):___________________________________
Label which side of the equation is the “product(s)” and the “reactant(s)” in the following:
3. __________________Ca
+2HCl ---> CaCl2 + H2________________(1pt)
4. __________________2KClO3
----> 2KCl + 3O2________________(1pt)
5. Which of the above reactions , #4 or #5, is endothermic?_____________(1pt)
The five reaction types are: synthesis, decomposition, single and double replacement, combustion
6. Which of the five types of reactions is the equation in #3__________________________(1pt)
7. Which of the five types of reactions is the equation in #4__________________________(1pt)
8. When a firecracker ignites and explodes, it give-off light and heat. Is that endothermic or
exothermic?________________________________(1pt)
9. Circle all of the observations below that signify that a chemical reaction has taken place:
Freezing
Cut in half
Release of a gas
Sublimation
Melting
Absorb heat
Formation of a precipitate
Release light
Change in color
Evaporation
10. Circle which of these changes in rock is a physical change? (1pt)
An ice wedge falling from a cliff and shattering a piece of sandstone
Iron in rock combining with oxygen to produce the red rust color in a hematite rock
Carbonic acid dissolving limestone in Austin to form caves
Acid rain falling in New York and eroding statues made of marble rock
11. Circle which of the following are chemical changes
Salt dissolving in water
Water boiling
Chocolate melting
fireworks exploding
the flame of a candle
biting an apple
decaying wood
digesting an apple
The five reaction types are: synthesis, decomposition, single and double displacement, combustion.
Identify the correct reaction occurring below.
12.
CaO + H2O  Ca(OH)2
13.
Cu(ClO3)2
14.
C2H6 + 3O2  2CO2 + 3H2O
15.
CaCO3 + 2HCl  CaCl2 + H2CO3
16.
Br2 + 2CuI  2CuBr + I2
HEAT
> 3O2 + CuCl2
TYPE OF RXN:_____________________________(1pt)
TYPE OF RXN:_____________________________(1pt)
TYPE OF RXN :_____________________________(1pt)
TYPE OF RXN:____________________________(1pt)
TYPE OF RXN:____________________________(1pt)
Mg + HCl  MgCl2 + H2
17. When the above equation is balanced, circle the correct coefficient for magnesium chloride
A. 1
B. 4
C. 0
D. 2
(1pt)
18. What is the coefficient for H2O when the above equation is balanced? K + H2O  KOH + H2
A. 3
B. 2
C. 4
D. 1
(1pt)
19. Chemical equations must be balanced to satisfy the…
(1pt)
a. Law of Definite Proportions
b. Law of Conservation of Mass
c. Law of Multiple Proportions
d. Principle of Mendeleev
W20. Which chemical equation supports the law of conservation of mass? (1pt)
a. 2H2O(l) + H2(g) O2(g)
b. Zn(s) + HCl(aq) ZnCl2(aq)+ H2(g)
c. Al4C3(s) + H2O(l) CH4(aq)+ Al(OH)3(s)
d. CH4(g) + 2O2(g) CO2(g)+ 2H2O(g)
**30 points total. Count all point awarded and write as a fraction over 30 at top of first page.