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WorksheetsChemistry Test 3
Total questions: 47
Worksheet time: 12hrs 45mins
Name
Class
Date
1.
If you were to compare how quickly different brands of chocolate-coated ice cream bars melted, with one experimental group for each brand, what should the control group be and why?
a)
there should be no control group because a control group is not needed because two or more experimental groups are being compared.
b)
ice-cream bar with the ice cream removed; a control group should not have the independent variable
c)
ice-cream bars with chocolate coating removed; a control group should not have the independent variable
d)
homemade ice-crea bars; a control group should be as similar as possble to the experimental groups
2.
In the engineering design process, a model of a design that is used for testing is called a ???????
a)
rototype
b)
qutototype
c)
prototype
d)
sototype
3.
How close a measurement is to its actual, exact value is its ??????
a)
accuracy
b)
precision
4.
If 7,830,000,000 is converted to scientific notation, the power of 10 should be ????
a)
10-9
b)
109
c)
10-7
d)
107
5.
A length in yards should be multiplied by ????????? to convert it to meters. (1 yd = 0.9144 m)
a)
1 m/0.9144 yd.
b)
1 yd./0.9144 m
c)
0.9144 m/1 yd
d)
0.9144 yd./1 m
6.
How many significant digits are in 0.0560?
a)
2
b)
3
c)
4
d)
5
7.
The state of matter that is difficult to compress and has particles that are close together but free to move is ?????????
a)
liquid
b)
plasma
c)
gas
d)
solid
8.
The chemical symbol for copper is ????
a)
Co
b)
Cr
c)
Cu
d)
C
9.
A mixture of pure substances that are incompletely mixed and form distinct phases is a ????????? mixture.
a)
heterogeneous
b)
homogeneous
10.
In nitrogen dioxide and dinitrogen pentoxide, the masses of oxygen that combine with 15 g of nitrogen are in a ratio of approximately 4 to 5. This fact demonstrates the law of ??
a)
definite composition
b)
multiple proportions
11.
Density is an example of a ??????? property.
a)
chemical
b)
physical
12.
The separation technique ???????? is based on the different way that each component in a mixture interacts with a stationary liquid or solid phase.
a)
fractional crystallization
b)
fractional distillation
c)
simple distillation
d)
chromatography
13.
The ?????????? experiment led to the development of the planetary model of atoms.
a)
Crookes-tube
b)
canal-ray
c)
gold-foil
d)
oil-drop
14.
The nuclear symbol of a neutral atom with 18 neutrons and 8 protons is ??????
a)
2610Ne
b)
1810Ne
c)
268O
d)
188O
15.
In alpha decay, an atom releases a particle from the nucleus consisting of 2 protons and 2 neutrons. What remains is a ??????? We know this because ?????
a)
different element; it has a different number of protons.
b)
anion of the original element; there are more eletrons than protons.
c)
cation of the original element; there are more protons than electrons
d)
isotope of the original element; it has a different number of neutrons.
16.
The weighted average of the atomic masses of the naturally occurring isotopes of an element is its ?????????
a)
atomic weight
b)
mass number
c)
average atomic mass
d)
atomic number
17.
The formula that tells how many of each type of atom is found in an actual molecule of a substance is its ???? formula.
a)
empirical
b)
molecular
18.
The name of the molecular compound P2S3 is ?????????
a)
triphosphorous disulfide
b)
diphosphorous trisulfide
c)
disulphurous triphosphide
d)
trisulphurous diphosphide
19.
The correct empirical formula for calcium phosphate is ???????????
a)
Ca(PO4)2
b)
Ca2PO4
c)
Ca3(PO4)2
d)
CaPO4
20.
The name of the ionic compound Cu2O is ??????
a)
dicopper monoxide
b)
dicopper oxide
c)
copper(I)oxide.
d)
copper(II) oxide
21.
To convert from the mass of a substance in grams to the amount of a substance in moles, ??????? by the molar mass of the substance.
a)
divide
b)
multiply
22.
The molar mass of sucrose (C12H22O11) is ???????
a)
366.25 g/mol
b)
342.30 g/mol
c)
32.104 g/mol
d)
29.018 g/mol
23.
If a percent composition of a compound is known, the ????????? is needed to determine the compound's molecular formula.
a)
isotopic abundance
b)
molar mass
c)
average atomic weight
d)
empirical formula
24.
When Al2O3 is decomposed to aluminum metal and oxygen gas, the correct coefficienct of Al is ????
a)
2
b)
3
c)
4
d)
5
25.
A ??????????? reaction has the form A + BC --------> AB + C.
a)
double displacement
b)
decomposition
c)
combination
d)
single displacement
26.
A ??????????? reaction occurs when a single reactant breaks down into two or more simpler substances.
a)
double displacement
b)
decomposition
c)
combination
d)
single displacement
27.
Density is an example of a physical property.
a)
4 mol H2O/1 mol C3H8
b)
5 mol O2/1 mol C3H8
c)
1 mol C3H8/5 mol O2
d)
1 mol C3H8/4 mol H2O
28.
To identify the limiting reactant if 5 mol N2H4 and 3 mol N2O4 react according to this unbalanced equation: __N2H4(l) + __N2O4(l) ----- __N2(g) + __H2O(l), the first calculation is ??????????
a)
(5 mol N2H4)x(4 mol N2/2 mol N2H4).
b)
(5 mol N2H4)x(2 mol N2/3 mol N2H4).
c)
(5 mol N2H4)x(3 mol N2/2 mol N2H4).
d)
(4 mol N2H4)x(3 mol N2/2 mol N2H4).
29.
The SI unit of pressure is ?????????
a)
pascal
b)
torr
c)
millimeter of mercury
d)
bar
30.
The assumption of the kinetic theory of matter that ??????? best explains why the volume of a gas is affected by temperature.
a)
gas molecules undergo elastic collisions.
b)
the kinetic energy of gas molecules is directly related to temperature
c)
the volume of gas molecules is negligible compared to the volume of the gas.
d)
there is negligible attraction between gas molecules
31.
The absorbance A of a solution is related to its concentration c by the equation A/c = Eb, where the product Eb is constant. The absorbance and concentration are ??? and this equation follows the pattern ???
a)
directly proportional; x = ky
b)
inversely proportional; x = k/y
c)
inversely proportional; x = ky
d)
directly proportional; x = k/y
32.
A gas that exactly obeys the assumptions of the kinetic theory is a/an ????????
a)
perfect gas
b)
wonderful gas
c)
ideal gas
33.
What is the pressure of a gas connected to an open-end manometer if the atmospheric pressure is 103.4 kPa and the mercury level is 46.0 mm lower on the atmosphere side?
a)
149.4 kPa
b)
109.5 kPa
c)
97.3 kPa
d)
57.4 kPa
34.
The equation for Boyle's law is ???????????
a)
Ptotal = p1 + p2 + p3 + …
b)
P1V1 = P2V2
c)
rate1/rate2 = square root(M2/M1)
d)
V1/n1 = V2/n2.
e)
V1/T1 = V2/T2
35.
The equation for Charles's law is ?????????????
a)
Ptotal = p1 + p2 + p3 + …
b)
P1V1 = P2V2
c)
rate1/rate2 = square root(M2/M1)
d)
V1/n1 = V2/n2.
e)
V1/T1 = V2/T2
36.
The pressure of a gas at STP is ???????
a)
80 kPa
b)
100 kPa
c)
90 kPa
d)
110 kPa
37.
What will be the pressure be if a gas occupies 1.55L at STP and the temperature is raised to 298.15 K and the gas expands to 1.63L?
a)
100 kPa
b)
102 kPa
c)
104 kPa
d)
106 kPa
38.
The equation for Avogadro's law is ??????????
a)
Ptotal = p1 + p2 + p3 + …
b)
P1V1 = P2V2
c)
rate1/rate2 = square root(M2/M1)
d)
V1/n1 = V2/n2.
e)
V1/T1 = V2/T2
39.
The value of R is ????????????
a)
22.7 L/mol
b)
273.15 K
c)
8.314 L.kPa/(K.mol)
d)
101.325 kPa
40.
If an effervescent tablet is dropped in water, carbon dioxide gas will be produced. If the container is immediately sealed, will the pressure increase or decrease, and why? (P = (RT/V)*n).
a)
decrease; P and V are inversely related at constant T and n.
b)
decrease; P and n are inversely related at constant T and V.
c)
increase; P and n are directly relaed at constant T and V.
d)
increase; P and V are directly related at constant T and n.
41.
A sealed container contains gases A and B. Gas B has twice the molar mass of gas A . The container is opened, allowing the gases to diffuse. Which gas will reach a nearby person first?
a)
Gas B will reach a nearby person first.
b)
Both arrive at the same time.
c)
Gas A will reach a nearby person first.
d)
More information is needed to answer.
42.
The name for the process of mixing molecules of one substance through another substance by random molecular motion is ???????
a)
osmosis
b)
photosynthesis
c)
diffusion
d)
respiration
43.
The equation for Dalton's law of partial pressures is ???????????
a)
Ptotal = p1 + p2 + p3 + …
b)
P1V1 = P2V2
c)
rate1/rate2 = square root(M2/M1)
d)
V1/n1 = V2/n2.
e)
V1/T1 = V2/T2
44.
The equation for Graham's law of diffusion is ????????????
a)
Ptotal = p1 + p2 + p3 + …
b)
P1V1 = P2V2
c)
rate1/rate2 = square root(M2/M1)
d)
V1/n1 = V2/n2.
e)
V1/T1 = V2/T2
45.
What is the pressure of a gas collected over water at 25 degrees C if the atmosphere pressure is 102.4 kPa and the vapor pressure of water at this temperature is 3.17 kPa?
a)
327 kPa
b)
105.6 kPa
c)
99.2 kPa
d)
32.3 kPa
46.
What volume of hydrogen gas at STP will be produced if 2.73 mol Na react according to this equation: 2Na(s) + 2H2O(l) -----> H2(g) + 2NaOH (aq)?
a)
124 L
b)
93.0 L
c)
62.0 L
d)
31.0 L
47.
P4(s) + 10Cl2(g) ------> 4PCl5(s). If 5.00 g P4 and 3.00 L Cl2 at 298 K and 103.0 kPa react completely, how many mole of PCl5 will be produced?
a)
0.0299 mol
b)
0.0399 mol
c)
0.0499 mol
d)
0.0599 mol
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