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.   14
B.   12
C.   25
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 = 26; atomic mass = 57
B.   atomic number = 31; atomic mass = 52
C.   atomic number = 26; atomic mass = 52
D.   atomic number = 31; atomic mass = 57
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.   number of neutrons
C.   total charge
D.   number of atoms in one mole
E.   charge on each electron
Question #4
What is the most common charge observed for the ion of aluminum?
A.   +1
B.   +2
C.   -3
D.   +3
Question #5
What is the correct name for NO2-?
A.   Nitrate
B.   Nitrogen dioxide
C.   Nitrite
D.   Nitrogen oxide
Question #6
What is the correct formula for sodium phosphate?
A.   Na3PO4
B.   Na2PO4
C.   NaPO4
D.   Na2(PO4)3
Question #7
What is the name for the ionic compound SnBr2?
A.   Tin dibromide
B.   Strontium(II) bromide
C.   Tin(II) bromide
D.   Tin 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.   N2O
B.   NO
C.   NH3
D.   N2H4
Question #10
What is the correct name for SiF4 ?
A.   Silicon fluoride
B.   Sulfur tetrafluoride
C.   Disilicon trifluoride
D.   Silicon tetrafluoride
Question #11
What is the proper name for C10H22?
A.   Decane
B.   Centane
C.   Dodecene
D.   Undecane
Question #12
How many atoms of chlorine are in 0.40 mol CaCl2?
A.   2.1×10-24 atoms
B.   2.4×1023 atoms
C.   4.8×1023 atoms
D.   2 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.   3.33 × 103 mol sodium
D.   6.31 × 10-3 mol sodium
Question #14
Calculate the formula percent of oxygen in C6H12O2.
A.   80.7 %
B.   10.4 %
C.   62.0 %
D.   27.5 %

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