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WorksheetsChemistry Regent - June 2014 Q21-30
Total questions: 10
Worksheet time: 14mins
Name
Class
Date
1.
What occurs during this reaction given the balanced equation representing a reaction: O2 → O + O
a)
Energy is absorbed as bonds are broken
b)
Energy is absorbed as bonds are formed
c)
Energy is released as bonds are broken
d)
Energy is released as bonds are formed
2.
In terms of entropy and energy, systems in nature tend to undergo changes toward
a)
lower entropy and lower energy
b)
lower entropy and higher energy
c)
higher entropy and lower energy
d)
higher entropy and higher energy
3.
Which term is defined as the difference between the potential energy of the reactants in a chemical reaction?
a)
activation energy
b)
thermal energy
c)
heat of fusion
d)
heat of reaction
4.
What is the atomic number of the element whose atoms bond to each other in chains, rings, and networks?
a)
10
b)
8
c)
6
d)
4
5.
How many pairs of electrons are shared between two adjacent carbon atoms in a saturated hydrocarbon?
a)
1
b)
2
c)
3
d)
4
6.
Given the balanced equation representing a reaction:
4Al(s) + 3O2(g)→2Al2O3(s) As the aluminum loses 12 moles of electrons, the oxygen
4Al(s) + 3O2(g)→2Al2O3(s) As the aluminum loses 12 moles of electrons, the oxygen
a)
gain 4 moles of electrons
b)
gains 12 moles of electrons
c)
loses 4 moles of electrons
d)
loses 12 moles of electrons
7.
Which compound is an electrolyte?
a)
CH2CHO
b)
CH3OCH3
c)
CH3COOH
d)
CH3CH2CH3
8.
Which statement describes one acid-base theory?
a)
an acid is an H+ acceptor, and a base is an H+ donor.
b)
an acid is an H+ donor, and a base is an H+ acceptor.
c)
an acid is an H- acceptor, and a base is an H- donor.
d)
an acid is an H- donor, and a base is an H- acceptor.
9.
Which compounds are classified as Arrhenius aids?
a)
HCl and NaOH
b)
HNO3 and NaCl
c)
NH3 and H2CO3
d)
HBr and H2SO4
10.
Which statement describes the stability of the nuclei of potassium atoms?
a)
all potassium atoms have stable nuclei that spontaneous decay
b)
all potassium atoms have unstable nuclei that do not spontaneously decay
c)
Some potassium atoms have unstable nuclei that spontaneously decay
d)
Some potassium atoms have unstable nuclei that do not spontaneously decay
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