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Midterm Review
Midterm Review
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1
What is qualitative data?
Data about number measurements
Data about physical traits
2
One example of a physical change is
dissolving salt in water
rusting metal
baking cookies
burning paper
3
What is the mass number of this isotope?
17
18
35
36
4
Mass number - atomic number =?
number of protons - number of neutrons
number of protons
number of protons +number of neutrons
number of neutrons
5
Which process represents a chemical change?
A metal bar is rolled into a flat sheet
A lake freezes over into ice
Vinegar bubbles when baking soda is added
Sand, water, and salt combine to form a mixture
6
How many electrons does Ca
+2
have?
24
22
18
20
7
Electrons ______ energy to jump to a higher energy level. They ______ when they jump down to a lower energy level
absorb, emit
emit, absorb
8
Which of the following points from Dalton's atomic theory is incorrect?
All atoms of the same element are identical.
All matter is composed of atoms.
None of the above
Atoms can be joined, separated, or rearraged in reactions.
9
Molar mass of Helium
13.01g/mol
101.08g/mol
99.01g/mol
4.00g/mol
10
A solid has _____________ shape and _______________ volume
definite, indefinite
indefinite, indefinite
definite, definite
indefinite, definite
11
Largest atomic radius?
Sr
Sn
I
12
Mass number = ________ + __________.
Protons + neutrons
Protons + electrons
Neutrons + electrons
13
Name this polyatomic ion
phosphate ion
nitrate ion
hydroxide ion
sulfate ion
14
Law of Conservation
energy cannot be created or destroyed
matter cannot be created or destroyed
15
Calculate the density of an object with a volume of 7.0 cm
3
and a mass of 56 g
8.0 g/cm3
8.0 cm3
0.13 g/cm3
390 g/cm3
16
Calculate atomic mass of Fe: 85% of Fe has a mass of 56.01 amu, 15% of Fe has a mass of 55.02 amu
56.85 amu
55.85 amu
58.85 amu
57.85 amu
17
What answer represents the mass number?
6
He
4
2
18
In a noble gas configuration, you must write the symbol of the preceding noble gas in brackets.
True
False
19
How do you find the volume of a cube?
Width x height
Length x width
Height x height
Length x width x height
20
What is uranium's mass number?
238
93
146
92
21
Which is NOT a part of Dalton’s Atomic Theory?
All atoms of the same element are identical
Atoms are rearranged in a chemical reaction
Atoms combine in whole number ratios to form compounds
Atoms can be destroyed.
22
How many moles in 187 g Al?
6.9 moles
1.02 x 1025 moles
5049 moles
2.8 x 1023 moles
23
Gasoline density: 0.67 g/mL and water density: 1.0 g/mL. Will gasoline float or sink?
gasoline will sink to the BOTTOM
gasoline will float on TOP
24
The molar mass of Cu is
29 g
63 g
50 g
64 g
25
What is the correct formula for zinc oxide?
Zn3O
ZnO
Zn3O2
Zn2O
26
A hypothesis must be ______________.
written in caps
testable
1000 words and double spaced
a question
27
The SI unit for mass is
milligram
pound
gram
kilogram
28
A gas has _____________ shape and _______________ volume
definite, indefinite
definite, definite
indefinite, indefinite
indefinite, definite
29
Which element has the smallest atomic radius?
Francium
Lithium
Fluorine
Radon
30
Noble Gas Configuration (Ba)
[He] 3s2
[Ar] 5s2
[Kr] 4s2
[Xe] 6s2
31
What is the unit of average atomic mass?
amu
g
cg
kg
32
What are the units for density of a liquid?
mass per force
grams per milliliters
lbs per meters
grams per cubic centimeters
33
atomic mass of Platinum
456.7
195.08
78
117.92
34
Thomson's model is called
Billiard Ball Model
Nuclear Model
Plum Pudding Model
35
What period do these elements belong to : Na, Mg, Si, P
1st period
3rd period
7th period
2nd period
36
Name this ionic compound:
Lead (IV) sulfate
Lead sulfur tetroxide
Lead sulfate
Lead (II) sulfate
37
Using a cathode ray tube, Thomson discovered
atoms
electrons
neutrons
protons
38
Which material has the highest density?
All the same.
Iron
Foam
Diamond
39
Find the metric conversion: 5.6kg = ?
56 g
560 g
0.056 g
5600 g
40
What is the mass number of sodium-23?
23
12
11
3
