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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
40.25 amu
B
38.74 amu
C
40.00 amu
D
40.078 amu
2) Who discovered the nucleus?
A
JJ Thomson
B
Aristotle
C
Rutherford
D
Dalton
3) How many particles are in 3.0 mol of aluminum?
A
6.02x10^23
B
26.98
C
1.6241x10^25
D
1.806x10^24
4) What is the molar mass?
A
The mass of one atom
B
The number of neutrons
C
The atomic number
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
ratio of neutrons to protons
C
ratio of protons to electrons
D
radioactivity
7) How many neutrons does the Ca-42 isotope have?
A
20
B
22
C
42
D
40
8) How many protons does the isotope O-16
A
8
B
0
C
2
D
16
9) The atomic number is equal to
A
number of protons
B
number of neutrons
C
the mass of the atom
D
number of isotopes
10) How did Rutherford conclude that there was a dense, positively charged nucleus?
A
gold is positively charged
B
all of the alpha particles were refracted
C
some of the alpha particles bounced back, but most went through
D
none of the alpha particles bounced back
11) How many much Nitrogen in grams is 93.41 mol of N?
A
1.31 kg N
B
1308 g N
C
6.67 g N
D
5.62x10^25 N
12) How many electrons are in the isotope Li-7
A
3
B
4
C
7
D
3.5
13) How do you solve for % abundance when given 2 isotopes?
A
get the mass contribution of both using the (mass)(percent)
B
set 1 variable to 1-x and the other to x, then solve algebraically
C
make a guess based on the mass
D
look up the answers
14) alpha particles are______
A
positively charged
B
negatively charged
C
heavy
D
neutral
15) How many atoms of Lithium are in 9.20 g?
A
38.4x10^23
B
7.98x10^23
C
2.20x10^-24
D
1.352
16) Convert 1.2x10^-4 mol Al to mass
A
3.28x10^3 kg
B
3.28 mg
C
3.28 g
D
3.28x10^3 mg
17) Which subatomic particles have mass?
A
electrons
B
isotopes
C
protons and neutrons
D
orbitals
*select an answer for all questions
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