Chem Jan 2011 Regents
(239).webp "Chem Jan 2011 Regents - Quiz")
These multiple choice questions came from January 2011. Use your best judgment. . . Eliminate wrong choices and, in some cases, find the ODD MAN OUT. . . That's usually (I SAID USUALLY) the right answer.
- 1.
Which one do you like?
- A.
A proton
- B.
An electron
- C.
A positron
- D.
A neutron
Correct Answer
B. An electronExplanation
Electrons are found in ORBITALS. The orbitals are not rings, but rather CLOUDS where you will PROBABLY find an electron.Rate this question:
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- 2.
Which statement matches a subatomic particle with its charge?
- A.
A neutron has a negative charge.
- B.
A proton has a negative charge.
- C.
A neutron has no charge.
- D.
A proton has no charge.
Correct Answer
C. A neutron has no charge.Explanation
PROTONS +
ELECTRONS -
NEUTRONS 0Rate this question:
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- 3.
An atom of any element must contain
- A.
An equal number of protons and neutrons
- B.
An equal number of protons and electrons
- C.
More electrons than neutrons
- D.
More electrons than protons
Correct Answer
B. An equal number of protons and electronsExplanation
An atom has equal protons and electrons. ISOTOPES deal with neutrons. IONS have different number of electrons (which gives ions their charges).Rate this question:
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- 4.
Which statement compares the masses of two subatomic particles?
- A.
The mass of an electron is greater than the mass of a proton.
- B.
The mass of an electron is greater than the mass of a neutron.
- C.
The mass of a proton is greater than the mass of an electron.
- D.
The mass of a proton is greater than the mass of a neutron.
Correct Answer
C. The mass of a proton is greater than the mass of an electron.Explanation
Protons and neutrons are the same mass. Electrons have very little (almost no) mass.
If you have any doubt, look at the TABLE O and pay attention to the mass.Rate this question:
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- 5.
The bright-line spectrum of sodium is produced when energy is
- A.
Absorbed as electrons move from higher to lower electron shells
- B.
Absorbed as electrons move from lower to higher electron shells
- C.
Released as electrons move from higher to lower electron shells
- D.
Released as electrons move from lower to higher electron shells
Correct Answer
C. Released as electrons move from higher to lower electron shellsExplanation
Bright-line goes from HIGHER to LOWER orbitals...as you go in, the energy decreases.Rate this question:
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- 6.
The valence electrons of a germanium atom in the ground state are located in the
- A.
First shell
- B.
Second shell
- C.
Third shell
- D.
Fourth shell
Correct Answer
D. Fourth shellExplanation
2
8
18
4...VALENCE!!!Rate this question:
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- 7.
The elements on the Periodic Table are arranged in order of increasing
- A.
Atomic mass
- B.
Atomic number
- C.
First ionization energy
- D.
Selected oxidation state
Correct Answer
B. Atomic numberExplanation
ATOMIC # = PROTON...nobody get's between me and my PROTONS.
(also, nobody knows who I am without my protons)Rate this question:
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- 8.
Which list of elements contains a metal, a metalloid, a nonmetal, and a noble gas?
- A.
Be, Si, Cl, Kr
- B.
C,N,Ne,Ar
- C.
K, Fe, B, F
- D.
Na,Zn,As,Sb
Correct Answer
A. Be, Si, Cl, KrExplanation
If you learned ANYTHING from me, it was the PERIODIC TABLE. If you don't know this by now, you won't learn it. EVER.
I WISH MR. SWERINGEN HAD A CHEM REVIEW CLASS...Rate this question:
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- 9.
The two forms of oxygen, O2(g) and O3(g), have
- A.
Different molecular structures and identical properties
- B.
Different molecular structures and different properties
- C.
Identical molecular structures and identical properties
- D.
Identical molecular structures and different properties
Correct Answer
B. Different molecular structures and different propertiesExplanation
O2 and O3 are different. O2 is oxygen and O3 is ozone. Talk about different...Rate this question:
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- 10.
The sum of the atomic masses of the atoms in one molecule of C3H6Br2 is called the
- A.
Formula mass
- B.
Isotopic mass
- C.
Percent abundance
- D.
Percent composition
Correct Answer
A. Formula massExplanation
It's called the GRAM FORMULA MASS, and it's calculated by adding up the masses of every atom in the composition...FOR EXAMPLE: water is H2O...2 HYDROGEN (= 2 x 1) and 1 OXYGEN (1 x 16)...18 is the formula mass of water.Rate this question:
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- 11.
What is the total number of electron pairs shared between the two atoms in an O2 molecule?
- A.
1
- B.
2
- C.
6
- D.
4
Correct Answer
D. 4Explanation
2 THINGS YOU SHOULD HAVE KNOWN:
1. O2 is a double bond.
2. Each bond is 2 electrons (4 total)Rate this question:
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- 12.
When an atom of lithium loses an electron, the atom becomes a
- A.
Negative ion with a radius smaller than the radius of the atom
- B.
Negative ion with a radius larger than the radius of the atom
- C.
Positive ion with a radius smaller than the radius of the atom
- D.
Positive ion with a radius larger than the radius of the atom
Correct Answer
C. Positive ion with a radius smaller than the radius of the atomExplanation
When a metal (in this case, a GROUP ONE METAL) loses an electron, it tends to lose not only an electron, but rather an entire orbital.
LITHIUM BEFORE: 2-1
LITHIUM AFTER: 2
When you lose an orbital, you lose a little bit of the radius...Rate this question:
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- 13.
Given the balanced equation representing a reaction: 2NaCl → 2Na + Cl2 To break the bonds in NaCl, the reactant must
- A.
Absorb energy
- B.
Create energy
- C.
Destroy energy
- D.
Release energy
Correct Answer
A. Absorb energyExplanation
It takes money to make money, so I guess it should take energy to make energy.
(BAD ANALOGY)
breaking bonds takes energy...as does reading all the words that i've put out for you...Rate this question:
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- 14.
A molecular compound is formed when a chemical reaction occurs between atoms of
- A.
Chlorine and sodium
- B.
Chlorine and yttrium
- C.
Oxygen and hydrogen
- D.
Oxygen and magnesium
Correct Answer
C. Oxygen and hydrogenExplanation
The key word is MOLECULAR. Molecular means COVALENT bonds, and 75% of those bonds were ionic (metal + nonmetal). Only ONE was correct. AND IT WAS WATER...Rate this question:
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- 15.
Which substance can not be broken down by chemical means?
- A.
Ammonia
- B.
Antimony
- C.
Methane
- D.
Water
Correct Answer
B. AntimonyExplanation
One is in TABLE E, one is in a fart, and the other is water. ONLY ANTIMONY (Sb) is an element. YOU CANNOT BREAK DOWN ELEMENTS.Rate this question:
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- 16.
Which two physical properties allow a mixture to be separated by chromatography?
- A.
Hardness and boiling point
- B.
Density and specific heat capacity
- C.
Malleability and thermal conductivity
- D.
Solubility and molecular polarity
Correct Answer
D. Solubility and molecular polarityExplanation
If something is SOLUBLE, it can travel up the paper (think Living Environment lab). If something is POLAR, it will stick to something else (again, THINK).Rate this question:
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- 17.
The solubility of KCl(s) in water depends on the
- A.
Pressure on the solution
- B.
Rate of stirring
- C.
Size of the KCl sample
- D.
Temperature of the water
Correct Answer
D. Temperature of the waterExplanation
TABLE G. Notice how the KCl line goes up?? That's because the solubility increases with temperature.Rate this question:
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- 18.
Which sample of water contains particles having the highest average kinetic energy?
- A.
25 mL of water at 95°C
- B.
45 mL of water at 75°C
- C.
75 mL of water at 75°C
- D.
95 mL of water at 25°C
Correct Answer
A. 25 mL of water at 95°CExplanation
AVERAGE KINETIC ENERGY means TEMPERATURE...the highest temperature is the 95C.Rate this question:
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- 19.
Under which conditions of temperature and pressure does carbon dioxide gas behave most like an ideal gas?
- A.
Low temperature and low pressure
- B.
Low temperature and high pressure
- C.
High temperature and low pressure
- D.
High temperature and high pressure
Correct Answer
C. High temperature and low pressureExplanation
HIGH TEMPERATURE (particles moving fast) and LOW PRESSURE (particles are expanding) is when gases behave like an IDEAL GAS.Rate this question:
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- 20.
Which process results in a chemical change?
- A.
Tearing tin foil
- B.
Melting an iron bar
- C.
Crushing an aluminum can
- D.
Burning magnesium ribbon
Correct Answer
D. Burning magnesium ribbonExplanation
Nothing can be UN-DONE...except for the ribbon. Or, if you took a picture next to it.Rate this question:
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- 21.
For a chemical reaction, the heat of reaction is equal to the
- A.
Potential energy of the reactants, only
- B.
Potential energy of the products, only
- C.
Potential energy of the products plus the potential energy of the reactants
- D.
Potential energy of the products minus the potential energy of the reactants
Correct Answer
D. Potential energy of the products minus the potential energy of the reactantsExplanation
Start MINUS finish. BTW, activation energy is how far one must roll the ball (or rock) up the hill.Rate this question:
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- 22.
Given the equation representing a system at equilibrium: At equilibrium, the concentration of
- A.
SO2(g) must equal the concentration of SO3(g)
- B.
SO2(g) must be constant
- C.
O2(g) must equal the concentration of SO2(g)
- D.
O2(g) must be decreasing
Correct Answer
B. SO2(g) must be constantExplanation
FORWARD must equal REVERSE.Rate this question:
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- 23.
The two isomers of butane have different
- A.
Formula masses
- B.
Empirical formulas
- C.
Molecular formulas
- D.
Structural formulas
Correct Answer
A. Formula massesExplanation
ISOMER means different neutrons...NEUTRONS mean a different mass...AHEM.Rate this question:
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- 24.
An oxidation-reduction reaction involves the
- A.
Sharing of electrons
- B.
Sharing of protons
- C.
Transfer of electrons
- D.
Transfer of protons
Correct Answer
C. Transfer of electronsExplanation
Somebody loses electrons, and somebody gains electrons...I'm just happy that I lost nothing...YET.Rate this question:
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- 25.
Which energy change occurs in an operating voltaic cell?
- A.
Chemical to electrical
- B.
Electrical to chemical
- C.
Chemical to nuclear
- D.
Nuclear to chemical
Correct Answer
A. Chemical to electricalExplanation
VOLTAIC CELLS involve salt bridges, Table J, and all that stuff...CHEMICAL energy gives rise to ELECTRICAL energy.Rate this question:
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- 26.
Which compound is an electrolyte?
- A.
Butene
- B.
Propane
- C.
Dimethyl ether
- D.
Methanoic acid
Correct Answer
D. Methanoic acidExplanation
ALL of them are organic compounds...though 3 of them are not ARRHENIUS ACIDS...Rate this question:
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- 27.
According to the Arrhenius theory, a base reacts with an acid to produce
- A.
Ammonia and methane
- B.
Ammonia and a salt
- C.
Water and methane
- D.
Water and a salt
Correct Answer
D. Water and a saltExplanation
BY DEFINITION: a neutralization reaction involves an Arrhenius acid + an Arrhenius base, producing water and a salt.Rate this question:
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- 28.
What is one benefit associated with a nuclear fission reaction?
- A.
The products are not radioactive.
- B.
Stable isotopes are used as reactants.
- C.
There is no chance of biological exposure.
- D.
A large amount of energy is produced.
Correct Answer
D. A large amount of energy is produced.Explanation
Nuclear reactions produce a GREAT DEAL of energy.Rate this question:
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- 29.
Which balanced equation represents a fusion reaction?
- A.
![Chem Jan 2011 Regents - Quiz]()
- B.
![Chem Jan 2011 Regents - Quiz]()
- C.
![Chem Jan 2011 Regents - Quiz]()
- D.
![Chem Jan 2011 Regents - Quiz]()
Correct Answer
B.Explanation
FUSION is when two become one.Rate this question:
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- 30.
Which radioisotope emits alpha particles?
- A.
Fe-53
- B.
Sr-90
- C.
Au-198
- D.
Pu-239
Correct Answer
D. Pu-239Explanation
Table N.Rate this question:
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- 31.
Which electron configuration represents the electrons of an atom in an excited state?
- A.
2-1
- B.
2-7-4
- C.
2-8-7
- D.
2-4
Correct Answer
B. 2-7-4Explanation
If an inner shell is not complete and an outer shell has electrons, it is EXCITED.Rate this question:
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- 32.
What is the total number of neutrons in an atom of O-18?
- A.
18
- B.
16
- C.
10
- D.
8
Correct Answer
C. 10Explanation
Neutrons are calculated by subtracting the atomic number (8) from the isotope number (18), which leaves 10Rate this question:
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- 33.
What is the net charge of an ion that has 8 protons, 9 neutrons, and 10 electrons?
- A.
1+
- B.
2+
- C.
1-
- D.
2-
Correct Answer
D. 2-Explanation
2 more electrons than protons...which means the charge is MINUS TWO.Rate this question:
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- 34.
Which element is malleable and a good conductor of electricity at STP?
- A.
Argon
- B.
Carbon
- C.
Iodine
- D.
Silver
Correct Answer
D. SilverExplanation
Characteristics of METALS...NA (silver) is a metal.Rate this question:
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- 35.
Which element has chemical properties that are most similar to the chemical properties of sodium?
- A.
Beryllium
- B.
Calcium
- C.
Lithium
- D.
Magnesium
Correct Answer
C. LithiumExplanation
SAME GROUP = SAME PROPERTIES.Rate this question:
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- 36.
If an element, X, can form an oxide that has the formula X2O3, then element X would most likely be located on the Periodic Table in the same group as
- A.
Ba
- B.
Cd
- C.
In
- D.
Na
Correct Answer
C. InExplanation
Oxygen has an oxidation state of -2, while In has an oxidation state of +3...switch the numbers.Rate this question:
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- 37.
What is the total mass of KNO3 that must be dissolved in 50. grams of H2O at 60.°C to make a saturated solution?
- A.
32 g
- B.
53 g
- C.
64 g
- D.
106 g
Correct Answer
B. 53 gExplanation
TRICK QUESTION: The KNO3 is dissolved in 50 g water...divide the assumed answer by TWO.Rate this question:
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- 38.
Which statement describes the general trends in electronegativity and metallic properties as the elements in Period 2 are considered in order of increasing atomic number?
- A.
Both electronegativity and metallic properties decrease.
- B.
Both electronegativity and metallic properties increase.
- C.
Electronegativity decreases and metallic properties increase.
- D.
Electronegativity increases and metallic properties decrease.
Correct Answer
D. Electronegativity increases and metallic properties decrease.Explanation
Electronegativity increases because the atoms get smaller...metallic properties decrease because we are moving RIGHT.Rate this question:
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- 39.
Which balanced equation represents a single- replacement reaction?
- A.
Mg + 2AgNO3 → Mg(NO3)2 + 2Ag
- B.
2Mg+O2→2MgO
- C.
MgCO3 → MgO + CO2
- D.
MgCl2 + 2AgNO3 → 2AgCl + Mg(NO3)2
Correct Answer
A. Mg + 2AgNO3 → Mg(NO3)2 + 2AgExplanation
RED/OX reactions are also single-replacement reactions.Rate this question:
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- 40.
Given the balanced equation representing a reaction: Fe(s) + 2HCl(aq) → FeCl2(aq) + H2(g) This reaction occurs more quickly when powdered iron is used instead of a single piece of iron of the same mass because the powdered iron
- A.
Acts as a better catalyst than the single piece of iron
- B.
Absorbs less energy than the single piece of iron
- C.
Has a greater surface area than the single piece of iron
- D.
Is more metallic than the single piece of iron
Correct Answer
C. Has a greater surface area than the single piece of ironExplanation
POWDERED means more reactions.Rate this question:
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- 41.
The temperature of a sample of water changes from 10°C to 20°C when the sample absorbs 418 joules of heat. What is the mass of the sample?
- A.
1 g
- B.
10 g
- C.
100 g
- D.
1000 g
Correct Answer
B. 10 gExplanation
Do the math: 418 / 10 (degrees C) =Rate this question:
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- 42.
Given the reaction at 101.3 kilopascals and 298 K: hydrogen gas + iodine gas → hydrogen iodide gas This reaction is classified as
- A.
Endothermic, because heat is absorbed
- B.
Endothermic, because heat is released
- C.
Exothermic, because heat is absorbed
- D.
Exothermic, because heat is released
Correct Answer
A. Endothermic, because heat is absorbedExplanation
Consult TABLE I...this reaction is ENDOTHERMIC...Rate this question:
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- 43.
Given the equation: Which type of reaction is represented by this equation?
- A.
Combustion
- B.
Esterification
- C.
Polymerization
- D.
Substitution
Correct Answer
C. PolymerizationExplanation
POLYMER is a long chain of the same thing. THIS IS A PERFECT EXAMPLE.Rate this question:
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- 44.
The graph below represents the uniform heating of a sample of a substance starting as a solid below its melting point. Which statement describes what happens to the energy of the particles of the sample during time interval DE?
- A.
Average kinetic energy increases, and potential energy remains the same.
- B.
Average kinetic energy decreases, and potential energy remains the same.
- C.
Average kinetic energy remains the same, and potential energy increases.
- D.
Average kinetic energy remains the same, and potential energy decreases.
Correct Answer
C. Average kinetic energy remains the same, and potential energy increases.Explanation
No temperature change, only potential energy.Rate this question:
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- 45.
Which molecule has a nonpolar covalent bond?
- A.
![Chem Jan 2011 Regents - Quiz]()
- B.
![Chem Jan 2011 Regents - Quiz]()
- C.
![Chem Jan 2011 Regents - Quiz]()
- D.
![Chem Jan 2011 Regents - Quiz]()
Correct Answer
A.Explanation
The only NONPOLAR bond is one that is bonded to itself.Rate this question:
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- 46.
Given the equation representing a reaction at equilibrium: What occurs when the concentration of H2(g) is increased?
- A.
The equilibrium shifts to the left, and the concentration of N2(g) decreases.
- B.
The equilibrium shifts to the left, and the concentration of N2(g) increases.
- C.
The equilibrium shifts to the right, and the concentration of N2(g) decreases.
- D.
The equilibrium shifts to the right, and the concentration of N2(g) increases.
Correct Answer
C. The equilibrium shifts to the right, and the concentration of N2(g) decreases.Explanation
Le Chatelier's principle...If you go to the right, the reactants (N2 and H2) will decrease. The reaction always goes away from the thing that was increased...and towards the thing that was decreased.Rate this question:
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- 47.
The table below gives information about four aqueous solutions at standard pressure. Which list of solutions is arranged in order from highest boiling point to lowest boiling point?
- A.
A, B, D, C
- B.
A, C, B, D
- C.
C, D, B, A
- D.
D, B, C, A
Correct Answer
A. A, B, D, CExplanation
molecular compounds have lower boiling points...C is the only molecular compound, so it should be at the END.Rate this question:
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- 48.
What is the total number of years that must pass before only 25.00 grams of an original 100.0-gram sample of C-14 remains unchanged?
- A.
2865 y
- B.
5730 y
- C.
11 460 y
- D.
17 190 y
Correct Answer
C. 11 460 yExplanation
2 HALF LIVES...which means there is 2 x 5730 years that have passed.Rate this question:
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- 49.
Which radioisotope is used for diagnosing thyroid disorders?
- A.
U-238
- B.
Pb-206
- C.
I-131
- D.
Co-60
Correct Answer
C. I-131Explanation
Thyroids need iodine...just memorize this fact.Rate this question:
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Mar 18, 2024Quiz Edited by
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Jun 17, 2012Quiz Created by
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