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Mid-Review Test
Mid-Review Test
20 terms
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Test Quiz
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Questions
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Answers
1
How many decimal places does 1.34 contain?
1
3
4
2
2
How many grams are in 67 moles of water? Find molar mass of water first-use sig figs.
3.7 moles H2O
3.718 moles H2O
1200 moles H2O
1237 moles H2O
3
What is the formula for sulfuric acid?
HSO4
H2S
HS
H2SO4
4
What unit did you learn/enjoy the most so far in chemistry this quarter?
measurement
nomenclature
chemical composition
atoms and molecules
5
What is the formula of barium chloride?
Ba2Cl2
BaCl2
Ba2Cl
BaCl
6
Classify a chocolate chip cookie.
Homogeneous mixture
Pure substance compound
Pure substance element
Heterogeneous mixture
7
In 39
.
348 g, there was 0.883 g of hydrogen, 10.497 g of Carbon, and 27.968 g of Oxygen. Calculate empirical formula.
H2CO2
HCO
H2C2O2
HCO2
8
What is the name of FeO?
Iron dioxide
Iron II oxide
Iron IV oxide
Iron oxide
9
What is the percent composition of H in water?
91.2%
89.1%
10.3%
11.2%
10
What does the mass number represent?
protons and neutrons
protons and electrons
Atomic mass
Atomic number
11
Convert 1.13 in into cm. (2.54 cm= 1 inch) Use sig figs
0.00445 cm
2.8702 cm
2.87 cm
0.00444882 cm
12
How many electrons does an aluminum cation contain?
9
13
16
10
13
What is the mass of a metal with a density of 4.1 g/cm3 and a volume of 77.8899 cm3? Use correct sig figs
0.0526 g
319 g
0.052 g
320 g
14
How many moles are in 3.21 molecules of carbon dioxide? Use correct sig figs.
1 mole of CO2
5.330454998 molecules of CO2
1.93 x 10 24 molecules of CO2
5.33 x 10 -24 molecules of CO2
15
Provide an example of a molecular compound.
NaCl
CO2
O2
CuCl
16
What is Avogadro's number equal to?
all of these
molecules
particles formula units
atoms
17
What was incorrect about Dalton's theory?
electrons weigh very little
electrons weigh a lot
atom is breakable
atom is unbreakable
18
Which group of elements are considered inert?
Alkali metals
Alkali Earth metals
Noble gases
Halogens
19
How many neutrons does C-14 contain?
7
6
8
5
20
How many molecules are in 44 g of carbon dioxide? Need molar mass of CO2 and use sig figs
6.0 x 10 23 molecules of CO2
390 molecules of CO2
3459.1 molecules of CO2
21 molecules of CO2
