2nd Nine Weeks Test Review
Matching
Match the terms below with their correct definitions.
a. / decomposition reaction / f. / synthesis reactionb. / chemical equation / g. / single-replacement reaction
c. / chemical reaction / h. / double-replacement reaction
d. / coefficient / i. / product
e. / combustion reaction / j. / reactant
____1.A reaction in which a single compound breaks produces two or more simpler substances
____2.A number written in front of a chemical formula
____3.A statement that uses chemical formulas to show the identities and relative amounts of the substances involved in a chemical reaction
____4.A reaction in which oxygen combines with a substance and releases heat and light energy
____5.A reaction in which the atoms of one element replace the atoms of another element in a compound
____6.A reaction involving the exchange of positive ions between two compounds dissolved in water
____7.The process by which the atoms of one or more substances are rearranged to form different substances
____8.A starting substance in a chemical reaction
____9.A substance formed during a chemical reaction
____10.A reaction in which two or more substances combine to form one new compound
Assume that Q, T, X, and Z are symbols for elements. Match each equation with the reaction type.
a. / decomposition / c. / single-replacementb. / double-replacement / d. / synthesis
____11.Q + XZ X + QZ
____12.Q + Z QZ
____13.QT Q + T
____14.QT + XZ QZ + XT
Add the appropriate coefficient to balance the following chemical equations.
15.
16.
17.
18.
19.
20.
21.In a laboratory, 178.8 g of water is separated into hydrogen gas and oxygen gas. The hydrogen gas has a mass of 20.0 g. What is the mass of the oxygen gas produced? Write an equation showing conservation of mass of reactants and products.
22. According to the law of conservation of mass, how much zinc was present in the zinc carbonate? ______
23. When 50 mL of isopropyl alcohol (39.5 g) is added to 50 mL of water (50 g), the mixture will have a volume of 98 mL. What is the mass in grams of this mixture? Record your answer to the nearest tenth on the answer document.
Identify the type of reaction for the following chemical equations:
24. ______P4 + O2 → P2O5
25. ______Fe + H2SO4 → Fe2(SO4)3 + H2
26. ______Pb(NO3)2 → PbO + NO2 + O2
27. ______Fe2(SO4)3 + KOH → K2SO4 + Fe(OH)3
28. ______C2H5OH + O2 → CO + H2O
29. Define the Law of Conservation of Mass:
30.If all the reactants in a chemical reaction arecompletely used, which of the following statements accurately describes therelationship between the reactants and theproducts?
AThe products must have a differentphysical state than the reactants.
B The total mass of the reactants mustequal the total mass of the products.
CThe reactants must contain more complexmolecules than the products do.
DThe density of the reactants must equalthe density of the products.
2nd Weeks Test Review
Answer Section
MATCHING
1.ANS:A
2.ANS:D
3.ANS:B
4.ANS:E
5.ANS:G
6.ANS:H
7.ANS:C
8.ANS:J
9.ANS:I
10.ANS:F
11.ANS:C
12.ANS:D
13.ANS:A
14.ANS:B
PROBLEM
15.ANS:
16.ANS:
17.ANS:
18.ANS:
19.ANS:
20.ANS:
21.ANS:
Masswater = Masshydrogen + Massoxygen; 178.8 g water = 20.0 g hydrogen
+ Massoxygen; Massoxygen = 178.8 g – 20.0 g; Massoxygen = 158.8 g
22.ANS:
8.4 g carbon/20.0 g sucrose 100% = 42.00% carbon
23.ANS:
51.30% oxygen = Massoxygen/20.0 g sucrose 100%;
51.30% oxygen 20.0 g sucrose/100% = Massoxygen = 10.3 g