WorksheetsRegents Chemistry - Year End Review
Total questions: 40
Worksheet time: 20mins
Which electron shell in an atom of calcium in the ground state has an electron with the greatest amount of energy?
1
2
3
4
What is the approximate mass of an atom that contains 26 protons, 26 electrons and 19 neutrons?
26u
45u
52u
71u
Two atoms that are different isotopes of the same element have
the same number of protons and the same number of neutrons
he same number of protons but a different number of neutrons
a different number of protons but the same number of neutrons
a different number of protons and a different number of neutrons
Compared to the energy of an electron in the second shell of an atom of sulfur, the energy of an electron in the
first shell is lower
first shell is the same
third shell is lower
third shell is the same
The element in Group 14, Period 3, of the Periodic Table is classified as a
metal
noble gas
metalloid
nonmetal
Which list represents the classification of the elements nitrogen, neon, magnesium, and silicon, respectively?
metal, metalloid, nonmetal, noble gas
nonmetal, noble gas, metal, metalloid
nonmetal, metalloid, noble gas, metal
noble gas, metal, metalloid, nonmetal
Which element is malleable at STP?
chlorine
copper
helium
sulfur
What is the·number of valence electrons in a nitrogen atom in the ground state?
6
2
7
14
As the elements in Period 2 of the Periodic Table are considered in order from left to right, which property generally decreases?
atomic radius
electronegativity
ionization energy
nuclear charge
Which information is sufficient to differentiate a sample of sodium from a sample of silver?
the mass of each sample
the volume of each sample
the reactivity of each sample with water
the same molecular structures and the same properties
What is the chemical formula for sodium oxalate?
NaO
Na2O
NaC2O4
Na2C2O4
Which two terms represent types of chemical formulas?
fission and fusion
oxidation and reduction
empirical and structural
endothermic and exothermic
What is the number of moles of CO2 in a 220.-gram sample of CO2 (gram-formula mass = 44 g/mol)?
0.20 mol
5.0 mol
15 mol
44 mol
Which equation represents a single replacement reaction?
2Al(s) + 3Cl2(g)--> 2AlCl3(s)
2Al(s) + 6HCl(aq)--> 2AlCl3(aq) + 3H2(g)
2AlCl3(s)--> 2Al(s) + 3Cl2(g)
AlCl3(aq) + 3KOH(aq)--> Al(OH)3(s) + 3KCl(aq)
When a sample of Mg(s) reacts completely with O2(g), the Mg(s) loses 5.0 moles of electrons. How many moles of electrons are gained by the O2(g)?
1.0 mol
2.5 mol
5.0 mol
10.0 mol
Which statement describes the energy and bonding changes as two atoms of fluorine become a molecule of fluorine?
Energy is absorbed as a bond is broken.
Energy is absorbed as a bond is formed.
Energy is released as a bond is broken.
Energy is released as a bond is formed.
The atoms of which element bond to one another in chains, rings, and networks?
barium
carbon
iodine
mercury
Which formula represents an asymmetrical molecule?
CH4
CO2
N2
NH3
Which form of energy is transferred when an ice cube at 0°C is placed in a beaker of water at 50°C?
chemical
electrical
nuclear
thermal
Which phase change results in an increase in entropy?
I2(g)--> I2(s)
CH4(g) --> CH4(l)
Br2(l) --> Br2(g)
H2O(l) --> H2O(s)
The graph above represents the relationship between time and temperature as heat is added at a constant rate to a sample of a substance.
During interval AB which energy change occurs for the particles in this sample?
The potential energy of the particles increases.
The potential energy of the particles decreases.
The average kinetic energy of the particles increases
The average kinetic energy of the particles decreases.
What is the amount of heat required to completely melt a 200.-gram sample of H2O(s) at STP?
334J
836J
66800J
452000J
Which term identifies a type of intermolecular force?
covalent bonding
hydrogen bonding
ionic bonding
metallic bonding
Which compound contains both ionic and covalent bonds?
KI
CaCl2
CH2Br2
NaCN
Table sugar can be separated from a mixture of table sugar and sand at STP by adding
sand, stirring, and distilling at 100.°C
sand, stirring, and filtering
water, stirring, and distilling at 100.°C
water, stirring, and filtering
Paper chromatography can separate the components of a mixture of colored dyes because the components have differences in
decay mode
thermal conductivity
ionization energy
molecular polarity
According to Table G, which substance forms an unsaturated solution when 80. grams of the substance are stirred into 100. grams of H2O at 10.°C?
KNO3
KI
NH3
NaCl
A solution is prepared using 0.125 g of glucose, , in enough water to make 250. g of total solution. The concentration of this solution, expressed in parts per million, is
5.00 x 101 ppm
5.00 x 102 ppm
5.00 x 103 ppm
5.00 x 104 ppm
Given the potential energy diagram representing a reaction
Which numbered interval represents the heat of reaction?
1
2
3
4
The effect of a catalyst on a chemical reaction is to provide a new reaction pathway that results in a different
potential energy of the products
heat of reaction
potential energy of the reactants
activation energy
Given the equation representing a solution equilibrium:
BaSO4(s)Ba2+(aq) + SO42- (aq)
What occurs when Na2SO4(s) is added to this system, increasing the concentration of SO42-(aq)?
The equilibrium shifts to the left, and the concentration of Ba2+ (aq) decreases.
The equilibrium shifts to the left, and the concentration of Ba2+(aq) increases.
The equilibrium shifts to the right, and the concentration of Ba2+(aq) decreases.
The equilibrium shifts to the right, and the concentration of Ba2+(aq) increases.
Which compound is saturated?
butane
ethene
heptene
pentyne
An alcohol and an ether have the same molecular formula, C2H6O. These two compounds
the same functional group and the same physical and chemical properties
the same functional group and different physical and chemical properties
different functional groups and the same physical and chemical properties
different functional groups and different physical and chemical properties
Given the organic functional group:
Which class of organic compounds has molecules with this functional group?
aldehydes
esters
ketones
organic acids
Given the equation representing a reaction:
3CuCl2(aq) + 2Al(s) --> 3Cu(s) + 2AlCl3(aq)
The oxidation number of copper changes from
+1 to 0
+2 to 0
+2 to +1
+6 to +3
When comparing voltaic cells to electrolytic cells, oxidation occurs at the
anode in both types of cells
cathode in both types of cells
anode in voltaic cells, only
cathode in voltaic cells, only
What is the color of bromcresol green indicator in a solution with a pH value of 2.0?
blue
green
red
yellow
Which statement describes a benefit of using fission reactions?
Radioactive waste must be stored for long periods of time.
Nuclear fuel consists of stable isotopes.
Gamma radiation is produced.
Large amounts of energy are produced per mole of reactant.
Using equal masses of reactants, which statement describes the relative amounts of energy released during a chemical reaction and a nuclear reaction?
The chemical and nuclear reactions release equal amounts of energy.
The nuclear reaction releases half the amount of energy of the chemical reaction.
The chemical reaction releases more energy than the nuclear reaction.
The nuclear reaction releases more energy than the chemical reaction.
A measured value for the atomic radius of platinum atoms was determined to be 143 picometers. Based on Table S, what is the percent error of this measured value?
0.10%
9.1%
10.%
13%
