CHEM 103 Final Exam Practice
Questions and Accurate Detailed
Answers
which state of water has highest density?
a) ice
b) liquid water
c) water vapor
d) both b & c - Answer: b
which of the following statements is correct about the specific gravity:
a) it is the ratio of density to water to the density of the substance
b) it is the ration of density of substance to the density of the water
c) its unit is g/mL
d) it has no unit
e) both b & d - Answer: e
which of the following statements is NOT true about the significant figure?
a) a number is significant if it is a zero between non-zero digits
b) a number is significant if it is a placeholder zero
c) a number is significant if it is in the coefficient of a number written in scientific notation
d) a number is significant if it is a zero at the end of a decimal number - Answer: b
in which set(s) do both numbers contain the same number of significant figures?
a) 102.10 and 102.001
b) 500.0 and 5.01 x 10^2
,c) 0.0000105 and 150000
d) 3.90 x 10^3 and 0.310 - Answer: d
which of the following statements best describes the atomic number and atomic mass number?
a) atomic number is number of protons and atomic mass number is number of neutrons
b) atomic number is number of electrons and atomic mass number is number of neutrons and
number of electrons
c) atomic number and atomic mass number tell what can and cannot move in an atom
d) atomic number is always higher than atomic mass number for an atom
e) you obtain the atomic mass number by adding the number of neutrons to the atomic number -
Answer: e
a radioactive substance produces alpha, beta and gamma rays. What are beta particles?
a) they are similar to the X-rays
b) they are the nucleus of Helium without the electrons
c) beta particles denote the nucleus of an atom
d) they are the fast-moving electrons emitted by the radioactive decay of the substance - Answer: d
which of the following statements is true for metalloids?
a) their properties are similar to metals
b) they are located along the heavy zigzag line between the metals and nonmetals in the periodic
table
c) they are used as semiconductors and insulators
d) they are shiny and ductile
e) both b &c - Answer: e
which species below is the nitride ion?
a) Na+
, b) NO3-
c) NO2-
d) NH4+
e) N3- - Answer: e
What group in the periodic table would the fictitious element X(*7 valence dots*) be found?
a) alkaline earth metals
b) halogens
c) chalcogens
d) alkali metals
e) transition metals - Answer: b
of the choices below, which one is NOT an ionic compound?
a) PCl5
b) CrCl6
c) RbCl
d) PbCl2
e) NaCl - Answer: a
Calcium reacts with a certain element to form a compound with the general formula CaX. What
would the most likely formula be for the compound formed between Lithium and element X?
a) Li2X
b) LiX2
c) Li2X3
d) Li2X2
e) LiX - Answer: a
Element M reacts with fluorine to form an ionic compound with the formula MF3. The M-ion has 10
electrons. Element M is __.
Questions and Accurate Detailed
Answers
which state of water has highest density?
a) ice
b) liquid water
c) water vapor
d) both b & c - Answer: b
which of the following statements is correct about the specific gravity:
a) it is the ratio of density to water to the density of the substance
b) it is the ration of density of substance to the density of the water
c) its unit is g/mL
d) it has no unit
e) both b & d - Answer: e
which of the following statements is NOT true about the significant figure?
a) a number is significant if it is a zero between non-zero digits
b) a number is significant if it is a placeholder zero
c) a number is significant if it is in the coefficient of a number written in scientific notation
d) a number is significant if it is a zero at the end of a decimal number - Answer: b
in which set(s) do both numbers contain the same number of significant figures?
a) 102.10 and 102.001
b) 500.0 and 5.01 x 10^2
,c) 0.0000105 and 150000
d) 3.90 x 10^3 and 0.310 - Answer: d
which of the following statements best describes the atomic number and atomic mass number?
a) atomic number is number of protons and atomic mass number is number of neutrons
b) atomic number is number of electrons and atomic mass number is number of neutrons and
number of electrons
c) atomic number and atomic mass number tell what can and cannot move in an atom
d) atomic number is always higher than atomic mass number for an atom
e) you obtain the atomic mass number by adding the number of neutrons to the atomic number -
Answer: e
a radioactive substance produces alpha, beta and gamma rays. What are beta particles?
a) they are similar to the X-rays
b) they are the nucleus of Helium without the electrons
c) beta particles denote the nucleus of an atom
d) they are the fast-moving electrons emitted by the radioactive decay of the substance - Answer: d
which of the following statements is true for metalloids?
a) their properties are similar to metals
b) they are located along the heavy zigzag line between the metals and nonmetals in the periodic
table
c) they are used as semiconductors and insulators
d) they are shiny and ductile
e) both b &c - Answer: e
which species below is the nitride ion?
a) Na+
, b) NO3-
c) NO2-
d) NH4+
e) N3- - Answer: e
What group in the periodic table would the fictitious element X(*7 valence dots*) be found?
a) alkaline earth metals
b) halogens
c) chalcogens
d) alkali metals
e) transition metals - Answer: b
of the choices below, which one is NOT an ionic compound?
a) PCl5
b) CrCl6
c) RbCl
d) PbCl2
e) NaCl - Answer: a
Calcium reacts with a certain element to form a compound with the general formula CaX. What
would the most likely formula be for the compound formed between Lithium and element X?
a) Li2X
b) LiX2
c) Li2X3
d) Li2X2
e) LiX - Answer: a
Element M reacts with fluorine to form an ionic compound with the formula MF3. The M-ion has 10
electrons. Element M is __.
