Chem 1010 - General Chemistry 1 » Fall 2021 » CH2 Chemical Compounds

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Question #1
How many neutrons are in the nucleus of 25Mg?
A.   12
B.   25
C.   14
D.   13
Question #2
Which are the correct values for an atom of iron that has 26 protons, 31 neutrons, and 26 electrons?
A.   atomic number = 31; atomic mass = 52
B.   atomic number = 26; atomic mass = 57
C.   atomic number = 31; atomic mass = 57
D.   atomic number = 26; atomic mass = 52
Question #3
The element Erbium, Er, has five abundant isotopes 164Er, 166Er, 167Er, 168Er, and 170Er. The difference among these five isotopes is the ______.
A.   charge in each proton
B.   total charge
C.   charge on each electron
D.   number of atoms in one mole
E.   number of neutrons
Question #4
What is the most common charge observed for the ion of aluminum?
A.   +2
B.   -3
C.   +3
D.   +1
Question #5
What is the correct name for NO2-?
A.   Nitrogen dioxide
B.   Nitrogen oxide
C.   Nitrite
D.   Nitrate
Question #6
What is the correct formula for sodium phosphate?
A.   NaPO4
B.   Na2(PO4)3
C.   Na3PO4
D.   Na2PO4
Question #7
What is the name for the ionic compound SnBr2?
A.   Tin dibromide
B.   Tin(II) bromide
C.   Tin bromide
D.   Strontium(II) bromide
Question #8
Which compound will yield an aqueous solution that conducts electricity?
A.   SCl4
B.   PF5
C.   C2H6O
D.   Mg(NO3)2
Question #9
What is the molecular formula for ammonia?
A.   NH3
B.   NO
C.   N2O
D.   N2H4
Question #10
What is the correct name for SiF4 ?
A.   Disilicon trifluoride
B.   Silicon fluoride
C.   Silicon tetrafluoride
D.   Sulfur tetrafluoride
Question #11
What is the proper name for C10H22?
A.   Undecane
B.   Dodecene
C.   Decane
D.   Centane
Question #12
How many atoms of chlorine are in 0.40 mol CaCl2?
A.   2.1×10-24 atoms
B.   2 atoms
C.   4.8×1023 atoms
D.   2.4×1023 atoms
Question #13
A typical serving of peanut brittle contains 145 mg of sodium. How many moles of sodium are contained in this amount of peanut brittle?
A.   3.33 × 10-3 mol sodium
B.   6.31 mol sodium
C.   6.31 × 10-3 mol sodium
D.   3.33 × 103 mol sodium
Question #14
Calculate the formula percent of oxygen in C6H12O2.
A.   80.7 %
B.   62.0 %
C.   10.4 %
D.   27.5 %

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