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3rd Q Review #2
Test Description: Aug 2017
Instructions: Answer all questions to get your test result.
1) What is the number of electrons in an atom that has 20 protons and 17 neutrons?
A
37
B
17
C
20
D
3
2) The mass of a proton is approximately equal to the mass of
A
an electron
B
a neutron
C
a beta particle
D
an alpha particle
3) Which phrase describes two forms of solid carbon, diamond and graphite, at STP?
A
different crystal structures and the same properties
B
the same crystal structure and different properties
C
the same crystal structure and the same properties
D
different crystal structures and different properties
4) The addition of a catalyst to a chemical reaction provides an alternate pathway that
A
increases the potential energy of reactants
B
increases the activation energy
C
decreases the potential energy of reactants
D
decreases the activation energy
5) Which process is commonly used to separate a mixture of ethanol and water?
A
filtration
B
ionization
C
titration
D
distillation
6) At STP, which sample contains the same number of molecules as 3.0 liters of H2(g)?
A
3.0 L of CH4(g)
B
6.0 L of N2(g)
C
1.5 L of NH3(g)
D
2.0 L of CO2(g)
7) What occurs when a magnesium atom becomes a magnesium ion?
A
Electrons are lost and the oxidation number decreases.
B
Electrons are gained and the oxidation number increases.
C
Electrons are lost and the oxidation number increases.
D
Electrons are gained and the oxidation number decreases.
8) The reaction of an Arrhenius acid with an Arrhenius base produces water and
A
an aldehyde
B
an ester
C
a halocarbon
D
a salt
9) In the formula XS, the symbol X could represent the element
A
Mg
B
Al
C
Na
D
Ar
10) Which list of symbols represents nonmetals, only?
A
C, Si, Ge
B
Li, Be, B
C
B, Al, Ga
D
P, S, Cl
11) Which aqueous solution has the highest boiling point at standard pressure?
A
2.0 M CaCl2(aq)
B
2.0 M KCl(aq
C
1.0 M CaCl2(aq
D
1.0 M KCl(aq)
12) The collision theory states that a reaction is most likely to occur when the reactants collide with the proper
A
formula masses
B
energy and orientation
C
molecular masses
D
density and volume
13) Which element has six valence electrons in each of its atoms in the ground state?
A
As
B
Ga
C
Kr
D
Se
14) One acid-base theory defines an acid as an
A
H+ donor
B
H- acceptor
C
H- donor
D
H+ acceptor
15) Which phrase describes the decay modes and the half-lives of K-37 and K-42 on table N?
A
the same decay mode but different half-lives
B
different decay modes but the same half-life
C
different decay modes and different half-lives
D
the same decay mode and the same half-life
16) Entropy is a measure of the
A
disorder of a system
B
acidity of a sample
C
concentration of a solution
D
chemical activity of an element
17) Which substance is an electrolyte?
A
C3H8
B
Xe
C
O2
D
KNO3
18) The atoms in a sample of an element are in excited states. A bright-line spectrum is produced when these atoms
A
absorb energy
B
emit (Release ) energy
C
absorb positrons
D
emit (Release ) positrons
19) Based on Table S, an atom of which element has the strongest attraction for electrons in a chemical bond?
A
sulfur
B
selenium
C
fluorine
D
carbon
20) An open flask is half filled with water at 25°C. Phase equilibrium can be reached after
A
the temperature is decreased to 15°C
B
the flask is stoppered
C
the temperature is increased to 35°C
D
more water is added to the flask
*select an answer for all questions
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