Download Practice Test 1 - Bakersfield College

Chemistry 2a
Practice Exam 1)
1) Which of the following is a pure, elemental substance?
A) Pb(s)
B) SO2(g)
C) H2O2(l)
D) CO(g)
2) Which of the following represents a chemical change?
A) breaking a piece of glass
B) molding melted silver
C) frying an egg
D) sublimation of dry ice
3) A dilute sugar solution is an example of a ________.
A) compound
B) heterogeneous mixture
C) homogeneous mixture
D) element
4) What is another name for a homogeneous mixture?
A) element
B) solution
C) pure substance
D) compound
5) Name the following elements:
A) K
B) Mn
C) Bi
D) N
_______________
_______________
_______________
_______________
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6.) What are the symbols for the following elements?
A) manganese
____________
B) cadmium ____________
C) argon ___________
D) beryllium
____________
7) Classify each of the following as an element or a compound.
A) CO gas _________________
B) ice
_________________
C) helium gas
_________________
D) sugar
_________________
8.) The density of a certain type of plastic is 0.85 g/cm3. If a sheet of this plastic is 10.0 m
long, 1.1 m wide, and 2 cm thick, what is its mass?
9.) If the temperature of a cup of coffee decreases from 80.0°C to25.0°C, what is the
decrease in units of degrees Celsius and Kelvin?
10.) How many protons are in each atom of each of the following elements?
A) magnesium ________
B) chlorine _________
C) silver __________
11.) How many protons, neutrons, and electrons are in each of the following?
A) 68Zn2+
________
________
________
B) 56Fe3+
________
________
________
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C) C ________
________
________
12.) A sample of pure lead (Pb) and a sample of pure tin (Sn) have the same mass. Which
sample has the greatest numbers of atoms?
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13.) Identify each of the following elements as a metal (specify type), nonmetal, or metalloid.
A) boron ___________
B) nickel ____________
C) aluminum ______________
D) silicon _______________
14.) For each element listed, write the symbol for the ion it forms.
A) nitrogen ____________
B) phosphorus __________
C) strontium __________
D) fluorine ___________
E) calcium ____________
15.) The noble gases are sometimes called “inert gases”. Why? Why do they not form ions?
16.) Molecular nitrogen and oxygen are the main components of the air we breathe. Write
formulas to represent the gases.
17.) Sulfur trioxide is hydrated (watered) to form a common acid. What is the name and
chemical formula for this acid?
18.) What element has 18 electrons when it forms an cation with a plus 2 charge?
19.) Determine if the following formulas represent ionic or molecular compounds.
A)
B)
C)
D)
Al2S3
P2O5
FeBr2
N2O
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20.) Name the following polyatomic ions.
A) SO32B) HCO3C) lO221. Write formulas for the following polyatomic ions.
A)
B)
C)
D)
cyanide
oxalate
dichromate
perbromate
22. Identify the ion types and numbers in the compounds represented in the following
formulas.
A)
B)
C)
D)
NaBr
AlCl3
Ba3(PO4)2
Mn(NO3)2
23. Name the following ionic compounds.
A)
B)
C)
D)
(NH4)2S
CoBr2
KClO3
Mn2O3
24. Given the following formulas, what is the charge on the metal ion? What is the name of
each compound?
A) CoBr3
B) FeSO4
________
________
_________________________
_________________________
25.) What are the common names for Cu2SO4 and CuSO4?
26.) Name the following acids.
A) H2S(aq) ___________________________
B) H2CrO4(aq)
___________________________
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27.) When perbromic acid dissociates in water, what ions are present in the solution?
28.) Indicate whether each of the following compounds are an electrolyte or non-electrolyte.
A) AgBr
B)CHCl3
_____________________
_____________________
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