# Unit 3 Review IB Question Preview (ID: 60013)

### Unit 3 Review IB. Answers? Play games to get them!

How many much Nitrogen in grams is 93.41 mol of N?
a) 1.31 kg N
b) 1308 g N
c) 5.62x10^25 N
d) 6.67 g N

How many electrons are in the isotope Li-7
a) 4
b) 3
c) 7
d) 3.5

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
d) make a guess based on the mass

How many protons does the isotope O-16
a) 8
b) 16
c) 2
d) 0

The atomic number is equal to
a) the mass of the atom
b) number of neutrons
c) number of protons
d) number of isotopes

How did Rutherford conclude that there was a dense, positively charged nucleus?
a) some of the alpha particles bounced back, but most went through
b) none of the alpha particles bounced back
c) all of the alpha particles were refracted
d) gold is positively charged

How many neutrons does the Ca-42 isotope have?
a) 20
b) 22
c) 42
d) 40

What determines the stability of a nucleus?
a) ratio of neutrons to protons
b) ratio of protons to electrons
c) atomic mass

What is the molar mass?
a) The mass of one atom
b) The mass of 1 mole of an atom in grams
c) The atomic number
d) The number of neutrons

Who said that electrons orbit around the nucleus in circular patterns?
a) Thomson
b) Dalton
c) Bohr
d) Rutherford

How many particles are in 3.0 mol of aluminum?
a) 6.02x10^23
b) 1.806x10^24
c) 26.98
d) 1.6241x10^25

Who discovered the nucleus?
a) Aristotle
b) Rutherford
c) Dalton
d) JJ Thomson

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) 40.00 amu
d) 38.74 amu

alpha particles are______
a) negatively charged
b) positively charged
c) neutral
d) heavy

How many atoms of Lithium are in 9.20 g?
a) 7.98x10^23
b) 2.20x10^-24
c) 38.4x10^23
d) 1.352

Convert 1.2x10^-4 mol Al to mass
a) 3.28 g
b) 3.28x10^3 kg
c) 3.28 mg
d) 3.28x10^3 mg

Which subatomic particles have mass?
a) electrons
b) isotopes
c) protons and neutrons
d) orbitals

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