Chem 101 Exam Questions & Revised
Correct Detailed Answers
Guaranteed Pass
1) What is the formula of the nitride ion?
A) NO3(2-)
B) N(3-)
C) NO2(-)
D) NO3(3-)
E) NO3(-) - ANSWER
B) N(3-)
2) Radium-226 decays by alpha decay to
A) carbon-14
B) polonium-218
C) radon-222...
5) How many valence electrons does nitrogen have?
A) one
B) two
C) three
D) four
,E) five - ANSWER E) five
Nitrogen is in group 5A
6) What is the symbol for the ion with 19 protons and 18 electrons?
A) F-
B) F+
C) Ar+
D) K-
E) K+ - ANSWER E) K+
electrons and protons should be the same. If there is one eletron less than the
proton its a positive
7) The correct formula for a compound formed from the elements Al and O is
A) Al2O3
B) Al2O
C) Al3O2
D) AlO3
E) AlO - ANSWER A) Al2O3
(Al3+) + (O2-)= Al2 + O3
8) Which one of the following compounds contains an ion with a 3+ charge?
A) MgCl2
, B) Fe2S
C) Fe2S2
D) FeCl3
E) FeS2 - ANSWER D) FeCl3
Fe(3+) + Cl(1-)
9) What is the correct formula for iron (III) sulfide?
A) FeS
B) Fe2S
C) Fe2S2
D) Fe2S3
E) FeS2 - ANSWER D) Fe2S3
Fe(3+) + S(2-)
10) The name of PbO2 is
A) plumbum oxide
B) lead dioxide
C) lead(II) oxide
D) lead (IV) oxide
E) lead oxigen - ANSWER D) PbO2
Pb(4+) + O(2-)
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