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