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Final Exam 1
Test Description: Final
Instructions: Answer all questions to get your test result.
1) You should pour water into acid.
A
True
B
False
2) A change of 1 pH unit represents a one hundred fold change in the acidity of the solution
A
True
B
False
3) pH is the measure of how acidic or basic a solution is
A
False
B
True
4) A pH above 7 is basic and a pH below 7 is acidic.
A
False
B
True
5) Endothermic reactions will always drop in temperature
A
False
B
True
6) In an exothermic reaction the system gains energy in the form of heat.
A
True
B
False
7) Endothermic reactions absorb energy from the surroundings
A
True
B
False
8) In the following equation, which of these is a reactant that is dissolved in water? Cu(s) + AgNO3(aq) → Ag(s) + Cu(NO3)2(aq)
A
Cu
B
Ag
C
AgNO3
D
Cu(NO3)2
9) We balance equations because:
A
all of the above
B
it follows the law of conservation of mass
C
mass cannot be created or destroyed
D
atoms can be rearranged but can not appear or disappear
10) In the reaction 2H2 + O2 → 2H2O, what is the mole ratio of oxygen to water?
A
2 mole O2/ 5 mol H2O
B
1 mole O2/ 2 mol H2O
C
2 mole O2/ 2 mol H2O
D
2 mole O2/ 1 mol H2O
11) For the reaction C + 2H2 → CH4, how many moles of hydrogen are required to produce 10 mol of methane, CH4?
A
4 mol
B
10 mol
C
2 mol
D
20 mol
12) For the reaction 2Na + 2H2O → 2NaOH + H2, how many grams of NaOH are produced from 3.0 mol of water?
A
40. g
B
120 g
C
80. g
D
240 g
13) For the reaction Pb(NO3)2 + 2KI → PbI2 + 2KNO3, how many moles of PbI2 are produced from 300. g of potassium iodide?
A
1.81 mol
B
0.903 mol
C
11.0 mol
D
3.61 mol
14) For the reaction 2Na + Cl2 → 2NaCl, how many grams of NaCl can be produced from 500. g of chlorine?
A
112 g
B
319 g
C
409 g
D
825 g
15) Which reactant controls the amount of product formed in a chemical reaction?
A
mole ratio
B
mass ratio
C
excess reactant
D
limiting reactant
16) What is the ratio of the actual yield to the theoretical yield, multiplied by 100%?
A
percent yield
B
Avogadro yield
C
mole ratio
D
excess yield
17) What is the study of the mass relationships among reactants and products in a chemical reaction?
A
stoichiometry
B
periodic law
C
percent yeild
D
limiting reactants
18) In the following problem, what element is the “known”? For the reaction Pb(NO3)2 + 2KI → PbI2 + 2KNO3, how many moles of PbI2 are produced from 300. g of KI?
A
Pb(NO3)2
B
KNO3
C
PbI2
D
KI
19) According to the kinetic-molecular theory, gases condense into liquids because of
A
elastic collisions.
B
forces between molecules.
C
atmospheric pressure.
D
gravity.
20) According to the kinetic-molecular theory, which substances are made of particles?
A
all matter except solids
B
ideal gases only
C
all matter
D
all gases
*select an answer for all questions
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