CHEM 104 Exam Study Guide 2026/2027 | Practice Questions, Answers & Comprehensive Chemistry Review

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chem 104 exam 1 practice
metalloids - CORRECT ANSWER-semiconductors are _______
A) metalloids. B) halogens C) transition elements.
D) metals. E) nonmetals.

O3 - CORRECT ANSWER-Which of the following is an element and a molecule?
A) Air B) He C) CO2 D) C E) O3

fluorine - CORRECT ANSWER-The ionization energy of chlorine is lower than
the ionization energy of ________.
A) calcium B) sodium C) hydrogen D) fluorine E) lithium

sugar - CORRECT ANSWER-Choose the pure substance from the list below.
A) lemonade B) sea water C) air D) sugar E) coffee

305 mg - CORRECT ANSWER-the recommended adult dos of elixophyllin, a
drug used to treat asthma is 6.00 mg/kg of body mass. Calculate the dose in
milligrams for a 112 lb person (1 kg= 2.20 lb)
A) 305 mg B) 672 mg C) 670 mg D) 300 mg E) 1478 mg

protons - CORRECT ANSWER-Z is the number of ________ in an atom.
A) protons and electrons B) protons
D) neutrons E) protons and neutrons
C) electrons

1.25x 10^3 kL - CORRECT ANSWER-how many kL does a 1.25x10^8 cL sample
contain?

unreactive - CORRECT ANSWER-Noble gases ________.
A) react vigorously with water
C) are unreactive
E) are good conductors of electricity
B) are liquids at room temperature
D) melt at high temperatures




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physical change - CORRECT ANSWER-when sugar dissolves in water, this is an
example of _________ A) change of shape B) change of element C) change of
size
D) physical change E) chemical change

electron - CORRECT ANSWER-the lightest of the subatomic particles is the
________ A) nucleus B) atom C) neutron D) electron E) proton

4 - CORRECT ANSWER-Silicon has ______ valence electrons
A) 4 B) 6 C) 10 D) 8 E) 2

[Ne] 3s^2 3p^4 - CORRECT ANSWER-abbreviated electron configuration for the
sulfur atom

Br - CORRECT ANSWER-which element would have physical and chemical
properties similar to chlorine?
A) Br B) Se C) O D) Ar E) P

76 - CORRECT ANSWER-An atom of 130Xe contains neutrons.
A) 184 B) 130 C) 76 D) 54 E) 131

C - CORRECT ANSWER-Which of the following statements about isotopes is
true?
A) Isotopes of the same element have the same mass.
B) Isotopes of the same element differ only in the number of electrons they
contain.
C) Neon-22 is heavier than neon-21.
D) Isotopes of the same element have the same natural abundance.
E) All elements have 3 or more naturally occurring isotopes.

Sn - CORRECT ANSWER-Which of the following is a metal and in the p-block?
A) Sn B) Mg C) Sc D) F E) B

Mg - CORRECT ANSWER-What neutral element has the electron 1s^2 2s^2
2p^6 3s^2?
A) Si B) Be C) Ca D) Mg E) Na




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3 - CORRECT ANSWER-How many 4p orbital are in an atom?
A) 2 B) 4 C) 1 D) 6 E) 3

all protons and neutrons - CORRECT ANSWER-In an atom, the nucleus contains
________.
A) an equal number of protons and electrons
B) all the protons and electrons
C) all the protons and neutrons
D) only protons
E) only neutrons

circle - CORRECT ANSWER-3s-orbital

cesium (Cs) - CORRECT ANSWER-the atomic radius of potassium is smaller
than the atomic radius of _______ A) hydrogen B) cesium (Cs)
D) sodium E) lithium
C) fluorine

E - CORRECT ANSWER-Which of the following numbers contains the
designated correct number of significant figures?A) 3.0650 4 significant figures
B) 0.003002 3 significant figures
C) 1.04 2 significant figures 3 significant figures
E) 156 000 3 significant figures
D) 0.043 00

278 - CORRECT ANSWER-a temperature of 41 degrees F is the same as _____
K
A) 314 B) 310 C) 278 D) 379 E) 268

microgram - CORRECT ANSWER-In which of the following is the metric unit
paired with its correct abbreviation?
A) megaliter / mL
B) microgram /
D) kilogram / cg
E) centimeter / km
C) gram / gm




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13 g - CORRECT ANSWER-The correct answer for the addition of 7.5 g + 2.26 g
+ 1.311 g + 2 g is ________.
A) 10 g B) 13.1 g C) 13.0 g D) 13 g E) 13.071 g

55.847 - CORRECT ANSWER-The atomic mass of iron is _________
A) 126.904 B) 55.847 C) 192.22 D) 26 E) 77

18 - CORRECT ANSWER-the maximum number of electrons that may occupy
the third principle shell is ______ A) 8 B) 10 C) 18 D) 32 E) 2

D - CORRECT ANSWER-Which one of the following properties describes a
liquid?
A) There is essentially no interaction between the particles.
B) It has its own shape.
C) It fills the entire volume of the container.
D) Its particles are close together.
E) Its particles move very rapidly.

1.30 x 10^-6 L - CORRECT ANSWER-scientific notation for 0.000 00130 L is
________.

69.72 amu - CORRECT ANSWER-Calculate the atomic mass of the unknown
element-X. It has two isotopes with the following masses and
natural abundances:
X-69 68.9256 amu 60.11%
X-71 70.9247 amu 39.89%

salt (NaCl) in a shaker - CORRECT ANSWER-Which of the following is a
compound?
A) mercury (Hg) in a gauge
B) titanium (Ti) in a golf club
C) aluminum (Al) in a can
D) gold (Au) in a ring
E) salt (NaCl) in a shaker

D - CORRECT ANSWER-Valence electrons are electrons located ________.
A) in the nucleus of an atom




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