name________
Chapter 7 TEST
CHEMICAL REACTIONS
PART 1:
PS ____
MULTIPLE CHOICE.
# ____
_____ 1. Which of these is not a sign of a chemical reaction?
a. A gas is given off.
c. Heat is released.
b. The material dissolves.
d. A color change occurs.
date:________
_____ 2. The substance that is formed in a chemical reaction is called the
a. polymer.
c. radical.
b. reactant.
d. product.
_____ 3. Which of the following stores chemical energy?
a. the temperature of a substance
c. the bonds of a molecule
b. the density of a substance
d. the nucleus of an atom
_____ 4. A type of reaction that produces an increase in temperature is
a. endothermic.
c. covalent.
b. exothermic.
d. nonpolar.
_____ 5. An example of an endothermic reaction is
a. bioluminescence by a firefly.
c. burning gasoline.
b. an exploding firecracker.
d. photosynthesis by a plant.
_____ 6. In a balanced chemical equation, the mass of the reactants is equal to the
a.atoms in a molecule.
c. volume of the reactants.
b.atomic mass of the elements.
d. mass of the products.
_____ 7. The decomposition of water can be brought about by
a. combustion.
c. synthesis reactions.
b. electrolysis.
d. oxidation.
______8. Catalysts that slow reactions are called
a. inhibitors.
c. balanced.
b. substrates.
d. endothermic.
______9. All of these are likely to speed up the rate of a reaction except
a. decreasing the surface area.
c. increasing the temperature.
b. increasing the pressure.
d. adding a catalyst.
In the space provided, write the letter of the term or phrase that best matches each description.
______10. CH4 + 2O2  CO2 + 2H2O
______11. 2NH3  N2 + 3H2
______12. 2NaCl + H2SO4  Na2SO4 + 2HCl
______13. Fe + S FeS
______14. 2Li + 2H2O 2LiOH
a.
b.
c.
d.
synthesis reaction
decomposition reaction
combustion reaction
single-displacement
reaction
e. double-displacement
reaction
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PART 2 : MATCHING.
A.
Product
D.
Chemical Energy
G.
Trial and Error
B.
E.
H.
Reactant
Chemical Reaction
Chemical Equation
C.
F.
Exothermic Reaction
Endothermic Reaction
____1.
A change in which one or more substances are converted into new substances.
____2.
A way to describe a chemical reaction using chemical formulas and other symbols;
Has a left side (reactants) and a right side (products) separated by an arrow.
____3.
The substances on the left side of the chemical equation.
What you start with (ingredients for making a cake)
____4.
Energy that is stored in the form of chemical bonds
____5.
The substances on the right side of the chemical equation.
What you end with (the cake itself)
____6.
A chemical reaction in which energy is released as heat.
Products have less energy than the reactants.
Energy of the reactants = ENERGY OF THE PRODUCTS + ENERGY RELEASED
____7.
A chemical reaction that requires energy input
Reactants have more energy than the products.
ENERGY OF THE REACTANTS + ENERGY ABSORBED = Energy of Products
____8.
Technique used to balance equations
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PART 3. TRUE OR FALSE. (.5 points each)
_______1.
When balancing equations you can change the subscripts of the products or
reactants.
_______2.
A firecracker exploding is an example of an endothermic reaction.
_______3.
Freezing water is an example of a chemical reaction.
_______4.
Energy is released when bonds are formed.
_______5.
Burning a loaf of bread is an example of a chemical reaction.
_______6.
Photosynthesis is an example of an endothermic reaction.
_______7.
In a chemical reaction, the mass of the reactants is less than the mass of the
products.
_______8.
A balanced chemical equation has the same number of atoms of each element
on both sides of the equation
_______9.
Combustion type reactions are exothermic.
_______10.
Energy is absorbed when bonds are broken.
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PART 4. MISCELLANEOUS
Label the following chemical equation using the words:
A.
D.
PRODUCT
COEFFICIENT
B.
E.
REACTANTS
YIELDS
C.
SUBSCRIPT
2.
1.
3.
4.
6.
5.
According to the law of conservation of mass, if the total mass of the product in this
chemical reaction is 19 g, what must the combined masses of the reactants be?
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PART 5.
Classify each of the following as being combustion (C),
synthesis (S), decomposition (D), single replacement (SR),
or double replacement (DR)
______1.
______2.
2Al2O3
4Al +3O2
______3.
CH4 + 2O2
CO2 + 2H2O
2KBr + Cl2
2KCl + Br2
______4.
______5.
______6.
______7.
______8.
Fe + S
FeS
______9.
Na2SO4 + BaCl2
2NaCl + BaSO4
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PART 6.
1.
Cl2 +
2.
P4 +
3.
Na +
4.
H2O2
Balance each of the following chemical equations correctly.
SHOW YOUR WORK ON THE ANSWER SHEET.
NaBr
O2
NaCl +
Br2
P4O10
O2
Na2O
H2O +
O2
EXTRA CREDIT
5.
Fe +
H2O
Fe3O4 +
H2
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
PART 7.
LISTS. Match each list with its proper title/description.
A.
Metal rusting, stomach growling, candle burning
B.
Bonds break, atoms rearrange, new bonds form
C.
Formation of a solid, formation of a gas, release of light energy, release of sound energy
D.
Carbon dioxide (CO2) and water (H2O)
E.
Temperature, surface area, concentration, pressure, size of molecules
F.
Pyrotechnician, photographer, chef, firefighter
G.
Synthesis, decomposition, combustion, single displacement, double replacement
______1.
Occupations involving chemical reactions
______2.
Clues that may tell you a chemical reaction is happening
______3.
Three examples of chemical reactions
______4.
Major types of chemical reactions
______5.
How new substances form in a chemical reaction
______6.
The products of a combustion reaction.
______7.
Factors affecting reaction rates
Chapter 7 TEST: CHEMICAL REACTIONS
ANSWER SHEET
PART 1:
MULTIPLE CHOICE.
PART 3: TRUE /FALSE
(.5 points each)
______1.
______8.
_______1. _______6.
______2.
______9.
_______2. _______7.
name________
PS ____
# ____
date:________
______3.
______10.
_______3. _______8.
PART 5: CLASSIFY
_______1. ________6.
______4.
______ 11.
_______4. _______9.
_______2. ________7.
______5.
______ 12.
_______5. _______10.
_______3. ________8.
______6.
______ 13.
_______4. ________9.
______7.
______ 14.
_______5.
PART 4: MISCELLANEOUS
_________________1.
PART 7: LISTS
____________________2.
_______1. _______5.
_________________3.
_______2. _______6.
_________________4.
_______3. _______7.
PART 2: MATCHING
_________________5.
_______4.
_______1. _______5.
_________________6.
PART 8: OGT
_______2. _______6.
_______1. _______5.
_______3. _______7.
_______2. _______6.
_______4. _______8.
_______3. _______7.
_______4. _______8.
PART 6.
1.
Cl2 +
2.
P4 +
3.
Na +
4.
H202
Balance each of the following chemical equations correctly.
SHOW YOUR WORK BELOW ON #1 ONLY.
NaBr
O2
NaCl +
Br2
P4O10
O2
Na2O
H2O +
O2
EXTRA CREDIT (3 points)
5.
Fe +
O2
Fe2O3
Part 10. SHORT ANSWER
Answer each of the following below. Use complete sentences when appropriate.
1.
Write down in the form of a chemical equation the process of making a roast beef
sandwich from two slices of bread, three slices of cheese, and 5 slices of roast beef. (2 points)
2.
List five signs that a chemical reaction is taking place. (5 points)
PART 8. OGT Questions