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Chemistry Regents Review
Chemistry Regents Review
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Review for the Regents of Chemistry.
Flashcards
70 cards
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Practice quiz
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Questions
70
Answers
1
A reaction is most likely to occur when reactant particles collide with...
both proper energy and proper orientation
neither proper energy nor proper orientation
proper energy, only
proper orientation, only
2
Two grams potassium chloride are completely dissolved in a sample of water in a beaker to form
a heterogeneous mixture
a compound
a homogeneous mixture
an element
3
For which compound is the process of dissolving in water exothermic?
NaOH
NaCl
NH4NO3
NH4Cl
4
According to the kinetic molecular theory for an ideal gas, all gas particles...
have strong intermolecular forces
have collisions that decrease the total energy of the system
are in random, constant, straight-line motion
are separated by small distances relative to their sizes
5
The elements on the Periodic Table are arranged in order of increasing...
Number of isotopes
Atomic number
Number of valance electrons
Mass number
6
Which element is a gas at STP?
Xenon
Phosphorus
Sulfur
Potassium
7
Which element is
least
likely to undergo a chemical reaction?
Fluorine
Carbon
Lithium
Neon
8
What occurs when potassium reacts with chlorine to form potassium chloride?
Electrons are shared and the bonding is ionic
Electrons are transferred and the bonding covalent
Electrons are transferred and the bonding is ionic
Electrons are shared and the bonding is covalent
9
At STP, which 2.0-gram sample of matter uniformly fills a 340-milliliter closed container?
KCl(aq)
Xe(g)
Br2(l)
Fe(NO3)2(s)
10
Under which conditions of temperature and pressure is a gas most soluble in water?
Low temperature and high pressure
Low temperature and low pressure
High temperature and low pressure
High temperature and high pressure
11
In an oxidation-reduction reaction, the number of electrons lost is...
less than the number of electrons gained
equal to the number of electrons gained
less than than the number of protons gained
equal to the number of protons gained
12
Which radioisotope is used to treat thyroid disorders?
I-131
Co-60
U-238
C-14
13
Which formula represents an alkane?
C2H2
C3H8
C3H4
C2H4
14
Which sample of matter is a mixture?
K(s)
KBr(aq)
KBr(s)
Br2(l)
15
Which element is a liquid at STP?
Francium
Cesium
Bromine
Iodine
16
Which equation shows conservation of atoms?
2H2 + O2 -> 2H2O
H2 + O2 -> H2O
H2 + O2 -> 2H2O
2H2 + 2O2 -> 2H2O
17
Which formulas represent one ionic compound and one molecular compound?
N2 and SO2
Cl2 and H2S
NaOH and BaSO4
BaCl2 and N2O4
18
Which particles have approximately the same mass?
An electron and a proton
A neutron and a proton
An electron and an aplha particle
A neutron and an alpha particle
19
What occurs when a reaction is at equilibrium?
The concentration of the reactants increases
The rates of the forward and reverse reactions are not equal
The rates of the forward and reverse reactions are equal
The concentration of the products increases
20
Which equation represents an oxidation-reduction reaction?
Zn + Sn4+ -> Zn2+ + Sn2+
3AgNO3 + Li3PO4 + Ag3PO4 + 3LiNO3
U-238 -> Th-234 + He-4
H+ + OH- -> H2O
21
As a result of the gold foil experiment, it was concluded that an atom...
Is a hard, indivisible sphere
Contains a small, dense nucleus
Has positrons and orbitals
Contains protons, neutrons, and electrons
22
All phosphorus atoms have the same...
Number of neutrons plus the number of electrons
Number of neutrons plus the number of protons
Mass number
Atomic number
23
Which word equation represents a neutralization reaction?
base + acid -> salt + water
salt + acid -> base + water
base + salt -> water + acid
salt + water -> acid + base
24
Which nuclear emission has the greatest mass and the
least
penetrating power?
A beta particle
An alpha particle
A positron
A neutron
25
Which ionic equation is balanced?
3Fe3+ + Al -> 3Fe2+ + Al3+
Fe3+ + 3Al -> Fe2+ + 3Al
Fe3+ + Al -> Fe2+ + Al3+
3Fe3+ + Al -> Fe2+ + 3Al3+
26
A sample of CO
2
(s) and a sample of CO
2
(g) differ in their...
Physical properties
Molecular structures
Empirical formulas
Chemical compositions
27
Which property could be used to identify a compound in the laboratory?
Mass
Volume
Melting point
Temperature
28
Which sample, when dissolved in 1L of water, produces a solution with the highest boiling point
0.1 mole KI
0.2 mole KI
0.1 mole MgCl2
0.2 mole MgCl2
29
Which phrase describes two forms of solid carbon, diamond, and graphite at STP?
Different crystal structure and the same properties
The same crystal structure and the same properties
Different crystal structure and different properties
The same crystal structure and different properties
30
Which statement describes a chemical property of silicon?
Silicon has a blue-gray color
Silicon melts at 1414oC
Silicon reacts with fluorine
Silicon is a brittle solid at 20oC
31
What is the overall charge of an ion that has 12 protons, 10 electrons, and 14 neutrons?
4+
2-
2+
4-
32
A change in the nucleus of an atom that converts the atom from one element to another is called
neutralization
combustion
transmutation
polymerization
33
What is the number of electrons in a completely filled second shell of an atom?
8
2
32
18
34
A beta particle may be spontaneously emitted from...
an unstable nucleus
a stable nucleus
an excited electron
a ground-state electron
35
Which formula represents an alkene?
C4H10
C2H6
C3H6
C5H12
36
Which statement describes the characteristics of a 0.01M KOH(aq) solution?
The solution is basic with a pH greater than 7
The solution is acidic with a pH greater than 7
The solution is basic with a pH less than 7
The solution is acidic with a pH less than 7
37
Which compound is a saturated hydrocarbon?
Propyne
Propene
Propane
Propanal
38
The molarity of an aqueous solution of NaCl is defined as the...
grams of NaCl per liter of solution
moles of NaCl per liter of solution
moles of NaCl per liter of water
grams of NaCl per liter of water
39
Given the balanced equation: 2KI + F
2
-> 2KF + I
2
Which type of chemical reaction is this?
Double replacement
Synthesis
Single replacement
Decomposition
40
Which type of substance yields hydrogen ions, H
+
, in an aqueous solution?
An Arrhenius base
An unsaturated hydrocarbon
A saturated hydrocarbon
An Arrhenius acid
41
Which type of change must occur to form a compound?
Nuclear
Physical
Phase
Chemical
42
Which phase change is exothermic?
Liquid to gas
Liquid to solid
Solid to liquid
Solid to gas
43
Which statement explains why a molecule of CH
4
is nonpolar?
The geometric shape of a CH4 molecule is symmetrical
The bonds between the atoms in a CH4 molecule are polar
The geometric shape of a CH4 molecule is asymmetrical
The bonds between the atoms in a CH4 molecule are ionic
44
Which substance can be broken down by chemical means?
Manganese
Magnesium
Methanol
Mercury
45
Which compounds are electrolytes?
C2H5OH and CH4
KOH and H2SO4
CH3OH and C5H12
C2H5OH and H2SO4
46
Which sample of CO
2
has a definite shape and a definite volume?
CO2(s)
CO2(aq)
CO2(l)
CO2(g)
47
What is the total number of moles of oxygen in 1 mole of N
2
O
3
?
5
3
2
1
48
The difference between the potential energy of the products and reactants is equal to the...
heat of reaction
activation energy of the forward reaction
heat of fusion
activation energy of the reverse reaction
49
Which substance contains particles held together by metallic bonds?
I2(s)
Ne(s)
N2(s)
Ni(s)
50
What is the empirical formula of a compound with the molecular formula N
2
O
6
?
N2O
NO
NO3
NO2
51
When a sample of a gas is heated in a sealed, rigid container from 200K to 400K, the pressure
decreased by a factor of 200
decreased by a factor of 2
increased by a factor of 200
increased by a factor of 2
52
Which set of values represents standard pressure and standard temperature?
1 atm and 101.3 K
101.3 atm and 273oC
101.3 kPa and 0oC
1 kPa and 273 K
53
In which type of reaction do two lighter nuclei combine to form one heavier nucleus?
Nuclear fusion
Nuclear fission
Reduction
Combustion
54
Standard pressure is equal to...
1 atm
1 kPa
273 atm
273 kPa
55
Matter is classified as a...
Homogeneous mixture or as a heterogeneous mixture
Substance, only
Substance or as a mixture of substances
Homogeneous mixture, only
56
Which term represents an intermolecular force in a sample of water?
Metallic bonding
Hydrogen bonding
Ionic
Covalent bonding
57
What is the total number of different elements present in NH
4
NO
3
?
9
4
7
3
58
What do the two wires need to be connected to in an electrolytic cell?
Each other
A voltmeter
A battery
A switch
59
At STP, 4 liters of O
2
contains the same total number of molecules as...
4L of CO2
2L of Cl2
8L of He
1L of NH3
60
A molecule of butane and a molecule of 2-butene both have the same total number of...
hydrogen atoms
carbon atoms
double bonds
single bonds
61
A double carbon-carbon bond is found in a molecule of...
pentyne
pentanol
pentane
pentene
62
What is the total number of moles present in 1 gram formula mass of Pb(C
2
H
3
O
2
)
2
?
9
3
15
14
63
A sample of hydrogen gas will behave most like an ideal gas under the conditions of...
High pressure and high temperature
High pressure and low temperature
Low pressure and low temperature
Low pressure and high temperature
64
Systems in nature undergo changes that result in...
higher energy and higher entropy
higher energy and lower entropy
lower energy and higher entropy
lower energy and lower entropy
65
An example of a binary compound is...
Potassium chlorate
Ammonium chlorate
Potassium chloride
Ammonium chloride
66
If an equation is balanced properly, both sides of the equation must have the same number of...
Molecules
Atoms
Coefficients
Moles of molecules
67
What process occurs in an operating voltaic cell?
Oxidation takes place at the cathode
Reduction takes place at the anode
Chemical energy is converted to electrical energy
Electrical energy is converted to chemical energy
68
What is the chemical name for H
2
SO
3
(aq)?
Sulfurous acid
Hydrosulfuric acid
hydrosulfurous acid
Sulfuric acid
69
What is the IUPAC name for the compound ZnO?
Zinc oxalate
Zinc peroxide
Zinc hydroxide
Zinc oxide
70
Based on Table
F
, which compound is
least
soluble in water?
Ca(OH)2
AgC2H3O2
Li2SO4
AlPO4
