WorksheetsRegents Chemistry June 2022 exam
Total questions: 50
Worksheet time: 26mins
Which subatomic particles are matched with their charges?
Protons are positive and neutrons are negative.
Protons are positive and electrons are negative
Protons are negative and neutrons have no charge.
Protons are negative and electrons have no charge.
Which conclusion directly resulted from the “gold foil experiment”?
Atoms are mostly empty space.
Atoms are hard, indivisible spheres.
Electrons are located in shells.
Electrons have a small mass.
The bright-line spectrum of an element is produced when excited-state electrons
absorb energy and move to higher energy states
absorb energy and move to lower energy states
release energy and move to higher energy states
release energy and move to lower energy states
The elements on the Periodic Table of the Elements are arranged in order of increasing
atomic mass
atomic number
mass number
oxidation state
Atoms of which element in Group 15 have the greatest electronegativity?
As
Bi
N
P
Which term represents the simplest whole number ratio of atoms of the elements in a compound?
atomic mass
formula mass
empirical formula
structural formula
How many electrons are shared in a triple bond between two atoms?
6
2
3
4
Given the equation representing a reaction:
Cl2 → Cl + Cl
What occurs during this reaction?
Energy is released as a bond is broken
Energy is released as a bond is formed.
Energy is absorbed as a bond is broken.
Energy is absorbed as a bond is formed.
Krypton atoms in the ground state tend not to bond with other atoms because their
second electron shell contains eight electrons
third electron shell contains eighteen electrons
innermost electron shell contains two electrons
outermost electron shell contains eight electrons
All matter can be classified as
an element
a compound
a mixture or an element
a mixture or a substance
Which sample at STP has the same chemical properties as 10. grams of Al(s) at STP?
10. grams of Si(s)
10. grams of Na(s)
5 grams of Al(s)
5 grams of Mg(s)
Which sample of matter can not be broken down by a chemical change?
antimony
ethanol
methane
water
Based on Table F, which 10.-gram sample, when thoroughly mixed with 1 liter of water at room temperature, forms a heterogeneous mixture?
ammonium chloride, NH4Cl
potassium iodide, KI
silver bromide, AgBr
sodium nitrate, NaNO3
Compared to a 1.0 M NaCl(aq) solution at 1.0 atm, a 2.0 M NaCl(aq) solution at 1.0 atm has
a lower boiling point and a lower freezing point
a lower boiling point and a higher freezing point
a higher boiling point and a lower freezing point
a higher boiling point and a higher freezing point
Which list includes three forms of energy?
temperature, chemical, thermal
temperature, thermal, alkalinity
electromagnetic, nuclear, chemical
electromagnetic, alkalinity, nuclear
Under which conditions of pressure and temperature is a real gas most like an ideal gas?
low pressure and low temperature
low pressure and high temperature
high pressure and low temperature
high pressure and high temperature
Which sample of argon gas has the same number of atoms as a 100.-milliliter sample of helium gas at 1.0 atm and 300. K?
50. mL at 1.0 atm and 300. K
50. mL at 0.5 atm and 300. K
100. mL at 0.5 atm and 300. K
100. mL at 1.0 atm and 300. K
Which process is a chemical change?
condensation of H2O(g)
synthesis of MgO(s)
evaporation of C2H5OH(l)
sublimation of CO2(s)
Which property is determined by the structure, arrangement, and interactions of the molecules of a substance at a given temperature and pressure?
atomic radius
half-life
formula mass
physical state
A collision between reactant particles is most likely to result in a reaction when the particles have proper orientation and proper
charge
energy
mass
radius
Given the equation representing a system at equilibrium:
2NO2(g) ⇌ N2O4(g)
Which statement describes this reaction at equilibrium?
The concentration of the reactant and the product must be equal.
The concentration of the reactant and the product must be constant.
The rates of the forward and reverse reactions are increasing.
The rates of the forward and reverse reactions are decreasing.
Which phrase describes the effect of adding a catalyst to a chemical reaction in order to increase the reaction rate?
provides a different reaction pathway with a lower activation energy
provides a different reaction pathway with a higher activation energy
uses the same reaction pathway with a higher activation energy
uses the same reaction pathway with a lower activation energy
Systems in nature tend to undergo changes toward
lower energy and less disorder
lower energy and greater disorder
higher energy and less disorder
higher energy and greater disorder
Which element must be present in an organic compound?
carbon
sulfur
nitrogen
oxygen
Which formula represents a saturated hydrocarbon?
C2H2
C2H4
C6H10
C6H14
Which reaction occurs at the anode in an electrochemical cell?
saponification
oxidation
esterification
reduction
Which statement describes the two types of reactions that occur in operating electrochemical cells?
Nonspontaneous reactions occur in voltaic cells, and spontaneous reactions occur in electrolytic cells.
Nonspontaneous reactions occur in electrolytic cells, and nonspontaneous reactions occur in voltaic cells.
Spontaneous reactions occur in voltaic cells, and nonspontaneous reactions occur in electrolytic cells.
Spontaneous reactions occur in electrolytic cells, and spontaneous reactions occur in voltaic cells.
Which term describes an acid according to one acid-base theory?
H+ acceptor
H+ donor
H2 acceptor
H2 donor
Which emission will be released from an unstable Fe-53 nucleus?
an alpha particle
a beta particle
a positron
a proton
What is a potential risk associated with radioactive isotopes?
biological exposure
curing of diseases
industrial measurements
tracing chemical processes
Which electron configuration represents the electrons of a phosphorus atom in an excited state?
2-8-5
2-8-6
2-7-6
2-7-4
A 26.7-gram sample of which element has a volume of 3.00 cubic centimeters at room temperature?
Cr
Cd
Nb
Ni
Which element is a nonmetal and solid at STP?
lead
nitrogen
sodium
sulfur
What is the molecular formula for CH3CH2COOCH3?
C2H4O
C2H4O2
C4H8O
C4H8O2
A substance conducts electricity in the liquid phase but not in the solid phase. This substance can be classified as
covalent
ionic
metallic
molecular
A student measured the melting point of a sample of gallium to be 309 K. Based on Table T, which numerical setup can be used to calculate the student’s percent error?
303K309K−303K×100
309K309K−303K×100
309K303K×100
303K309K×100
Which chemical bond is most polar?
a O–H bond in H2O
a S–H bond in H2S
a Se–H bond in H2Se
a Te–H bond in H2Te
What is the amount of heat required to melt 43 grams of solid magnesium oxide at its melting point? The heat of fusion is 1.9 x 103 J/g.
2.3 x102 J
4.4 x 101 J
8.2 x104 J
3.4 x105 J
Given the diagram of a laboratory apparatus:
This apparatus is used for which process?
filtration
distillation
chromatography
electrolysis
Solid aluminum has a specific heat capacity of 0.90 J/g•K. How many joules of heat are absorbed to raise the temperature of 24.0 grams of aluminum from 300. K to 350. K?
22 J
45 J
1100 J
1200 J
Based on Table G, which solute sample in 100.g of water at 40.°C can produce a solution equilibrium in a closed system?
10. g KClO3
25 g NaCl
45 g KCl
55 g KNO3
Given the equation representing a system at equilibrium:
2SO2(g) + O2(g) ⇌ 2SO3(g) + energy
Which change favors the forward reaction?
increasing the concentration of O2(g)
increasing the temperature
decreasing the pressure
decreasing the concentration of SO2(g)
When ice, H2O(s), melts at 0°C, entropy increases because the
average kinetic energy of the particles increases
average kinetic energy of the particles decreases
particle arrangement is more random
particle arrangement is less random
At STP, propanal and propanone have different chemical properties due to their different
molecular masses
empirical formulas
percent compositions
functional groups
Given the formula for a compound:
What is the IUPAC name of the compound?
2,3-dimethyloctane
2,3-dimethylhexane
4,5-dimethyloctane
4,5-dimethylhexane
Given the formula representing a compound:
This compound is classified as an
amide
amine
ester
ether
Which substance is an electrolyte?
H2
HCl
C6H14
C6H12O6
An indicator is added to an aqueous solution with a pH value of 5.6. Which indicator is paired with its observed color in this solution?
Methyl orange is yellow
Phenolphthalein is pink.
Bromcresol green is yellow
Thymol blue is blue
Solution A has a pH value of 2.0 and solution B has a pH value of 4.0. How many times greater is the hydronium ion concentration in solution A than the hydronium ion concentration in solution B?
10
2
100
4
Which net change occurs in both nuclear fission and nuclear fusion reactions?
Mass is converted to energy
Energy is converted to mass
Small nuclei form a larger nucleus
A large nucleus forms smaller nuclei
