Chem 121 Final exam practice
Study online at https://quizlet.com/_e7vxrq
1. Which of the following statements is TRUE? Elements in the same group on
a) Carbon is a diatomic molecule the periodic table have similar
.b) Elements in the same group on the periodic table chemical properties.
have similar chemical properties.
c) Intensive physical properties depend on the C is not one of 7 diatomics,
amount of the substance present. intensive properties are inde-
d) The SI unit for temperature is Celsius. pendent of amount, SI unit of
e) One cL of water is less than one mL of water. temperature is Kelvin, and one
centiliter (cL) is more than one
milliliter (mL).
2. How many protons (p), electrons (e) and neutrons a) 20 p, 20 e, 26 n
(n) are in an atom of calcium-46 (46Ca)?
a) 20 p, 20 e, 26 n Calcium has an atomic num-
b) 20 p, 20 e, 46 n ber of 20 so 20 protons. Since
c) 26 p, 20 e, 20 n an atom has the same number
d) 46 p, 46 e, 60 n of electrons. Isotope has mass
e) 20 p, 26 e, 26 n number of 46 (p + n) so must
have 26 neutrons.
3. An element has two naturally occurring isotopes. atomic wt =
One has an abundance of 37.40% and an isotopic (0.3740)(184.953amu) +
mass of 184.953 amu, and the other has an abun- (0.6260)(186.956) = 186.2
dance of 62.60% and a mass of 186.956 amu. What amu
is the atomic weight of the element (to 4 sig figs)?
a) 185.7 amu
b) 185.0 amu
c) 186.2 amu
d) 187.0 amu
e) 189.4 amu
4. What is the molar mass (molecular weight) of Co = 58.93 g/mol
Co(NO3)2? 2 N = 2(14.01) = 28.02 g/mol
, Chem 121 Final exam practice
Study online at https://quizlet.com/_e7vxrq
a) 91.94 g/mol 6 O = 6(16.00) = 96.00 g/mol
b) 120.9 g/mol Co(NO3)2 = 182.95 = 183.0
c) 167.0 g/mol g/mol
d) 183.0 g/mol
e) 152.9 g/mol
5. The following are all properties of chlorine. Which of a) Chlorine combines with
the following does NOT describe a physical property sodium to form table salt is a
of chlorine? chemical property.
a) Chlorine combines with sodium to form table
salt.
b) The color of chorine gas is green.
c) The density of chlorine gas at standard tempera-
ture and pressure is 3.17 g/L.
d) The freezing point of chlorine is -101 °C.
e) All of the above describe the physical properties
of chlorine.
6. The mass of a proton is 1.67 × 10-27 kg. What is the 1.67x10-27 kg x 1000 g/1kg x
mass of a proton in Gigagrams? 1 Gg/1x10^9 g = 1.67 x 10-33
a) 1.67 × 1039 Gg Gg
b) 1.67 × 10-36 Gg
c) 1.67 × 10-33 Gg
d) 1.67 × 10-30 Gg
e) 1.67 x 1030 Gg
7. Which of the following is a pure element? c) tin
a) salt water
b) carbon monoxide
c) tin
d) milk
e) None of these are pure elements.
Study online at https://quizlet.com/_e7vxrq
1. Which of the following statements is TRUE? Elements in the same group on
a) Carbon is a diatomic molecule the periodic table have similar
.b) Elements in the same group on the periodic table chemical properties.
have similar chemical properties.
c) Intensive physical properties depend on the C is not one of 7 diatomics,
amount of the substance present. intensive properties are inde-
d) The SI unit for temperature is Celsius. pendent of amount, SI unit of
e) One cL of water is less than one mL of water. temperature is Kelvin, and one
centiliter (cL) is more than one
milliliter (mL).
2. How many protons (p), electrons (e) and neutrons a) 20 p, 20 e, 26 n
(n) are in an atom of calcium-46 (46Ca)?
a) 20 p, 20 e, 26 n Calcium has an atomic num-
b) 20 p, 20 e, 46 n ber of 20 so 20 protons. Since
c) 26 p, 20 e, 20 n an atom has the same number
d) 46 p, 46 e, 60 n of electrons. Isotope has mass
e) 20 p, 26 e, 26 n number of 46 (p + n) so must
have 26 neutrons.
3. An element has two naturally occurring isotopes. atomic wt =
One has an abundance of 37.40% and an isotopic (0.3740)(184.953amu) +
mass of 184.953 amu, and the other has an abun- (0.6260)(186.956) = 186.2
dance of 62.60% and a mass of 186.956 amu. What amu
is the atomic weight of the element (to 4 sig figs)?
a) 185.7 amu
b) 185.0 amu
c) 186.2 amu
d) 187.0 amu
e) 189.4 amu
4. What is the molar mass (molecular weight) of Co = 58.93 g/mol
Co(NO3)2? 2 N = 2(14.01) = 28.02 g/mol
, Chem 121 Final exam practice
Study online at https://quizlet.com/_e7vxrq
a) 91.94 g/mol 6 O = 6(16.00) = 96.00 g/mol
b) 120.9 g/mol Co(NO3)2 = 182.95 = 183.0
c) 167.0 g/mol g/mol
d) 183.0 g/mol
e) 152.9 g/mol
5. The following are all properties of chlorine. Which of a) Chlorine combines with
the following does NOT describe a physical property sodium to form table salt is a
of chlorine? chemical property.
a) Chlorine combines with sodium to form table
salt.
b) The color of chorine gas is green.
c) The density of chlorine gas at standard tempera-
ture and pressure is 3.17 g/L.
d) The freezing point of chlorine is -101 °C.
e) All of the above describe the physical properties
of chlorine.
6. The mass of a proton is 1.67 × 10-27 kg. What is the 1.67x10-27 kg x 1000 g/1kg x
mass of a proton in Gigagrams? 1 Gg/1x10^9 g = 1.67 x 10-33
a) 1.67 × 1039 Gg Gg
b) 1.67 × 10-36 Gg
c) 1.67 × 10-33 Gg
d) 1.67 × 10-30 Gg
e) 1.67 x 1030 Gg
7. Which of the following is a pure element? c) tin
a) salt water
b) carbon monoxide
c) tin
d) milk
e) None of these are pure elements.
