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Unit 3 Review IB
Test Description: Unit 3 review IB
Instructions: Answer all questions to get your test result.
1) Ca-40 makes up 96.941% with a mass of 39.96259 amu. Assume that there is only 1 other isotope; Ca-42 that makes up the remainder of the % and has a mass of 41.959. Calculate the atomic mass of the element Calcium (this may not match periodictable)
A
40.078 amu
B
40.25 amu
C
38.74 amu
D
40.00 amu
2) Who discovered the nucleus?
A
Rutherford
B
JJ Thomson
C
Dalton
D
Aristotle
3) How many particles are in 3.0 mol of aluminum?
A
1.6241x10^25
B
26.98
C
1.806x10^24
D
6.02x10^23
4) What is the molar mass?
A
The atomic number
B
The mass of one atom
C
The number of neutrons
D
The mass of 1 mole of an atom in grams
5) Who said that electrons orbit around the nucleus in circular patterns?
A
Dalton
B
Bohr
C
Rutherford
D
Thomson
6) What determines the stability of a nucleus?
A
atomic mass
B
radioactivity
C
ratio of neutrons to protons
D
ratio of protons to electrons
7) How many neutrons does the Ca-42 isotope have?
A
40
B
42
C
22
D
20
8) How many protons does the isotope O-16
A
2
B
16
C
8
D
0
9) The atomic number is equal to
A
number of neutrons
B
the mass of the atom
C
number of protons
D
number of isotopes
10) How did Rutherford conclude that there was a dense, positively charged nucleus?
A
gold is positively charged
B
some of the alpha particles bounced back, but most went through
C
none of the alpha particles bounced back
D
all of the alpha particles were refracted
11) How many much Nitrogen in grams is 93.41 mol of N?
A
1.31 kg N
B
6.67 g N
C
1308 g N
D
5.62x10^25 N
12) How many electrons are in the isotope Li-7
A
4
B
3.5
C
3
D
7
13) How do you solve for % abundance when given 2 isotopes?
A
get the mass contribution of both using the (mass)(percent)
B
look up the answers
C
set 1 variable to 1-x and the other to x, then solve algebraically
D
make a guess based on the mass
14) alpha particles are______
A
heavy
B
positively charged
C
negatively charged
D
neutral
15) How many atoms of Lithium are in 9.20 g?
A
7.98x10^23
B
1.352
C
38.4x10^23
D
2.20x10^-24
16) Convert 1.2x10^-4 mol Al to mass
A
3.28 mg
B
3.28 g
C
3.28x10^3 mg
D
3.28x10^3 kg
17) Which subatomic particles have mass?
A
orbitals
B
isotopes
C
electrons
D
protons and neutrons
*select an answer for all questions
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