C6.10 Chemistry Regents Exam Part A Questions 1-10
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Question 1 of 10
1. Question
Category: 13. Nuclear ChemistryThe gold foil experiment led to the conclusion that each atom in the foil was composed mostly of empty space because most alpha particles directed at the foil
Correct
in the gold foil experiment, more than 99% of the alpha particles passed thorough the gold foil with little or no deflection. As a result, Rutherford concluded that most of the volume of each gold atom was empty space.
Incorrect
in the gold foil experiment, more than 99% of the alpha particles passed thorough the gold foil with little or no deflection. As a result, Rutherford concluded that most of the volume of each gold atom was empty space.
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Question 2 of 10
2. Question
Category: 3. Atomic ConceptsWhich subatomic particles are located in the nucleus of a carbon atom?
Correct
Protons and neutrons are located int he nucleus of any atom, carbon included. Electrons are located outside the nucleus.
Incorrect
Protons and neutrons are located int he nucleus of any atom, carbon included. Electrons are located outside the nucleus.
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Question 3 of 10
3. Question
Category: 3. Atomic ConceptsWhich part of a helium atom is positively charged?
Correct
The proton is the only positive particle in an atom. It is located in the nucleus. Neutrons are neutral, with a zero charge also located in the nucleus. Electrons are negatively charged and are located outside the nucleus in orbitals.
Incorrect
The proton is the only positive particle in an atom. It is located in the nucleus. Neutrons are neutral, with a zero charge also located in the nucleus. Electrons are negatively charged and are located outside the nucleus in orbitals.
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Question 4 of 10
4. Question
Category: 3. Atomic ConceptsThe mass of a proton is approximately equal to the mass of
Correct
A neutron has approximately the same mass as a proton.
Incorrect
A neutron has approximately the same mass as a proton.
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Question 5 of 10
5. Question
Category: 4. Periodic TableAt STP, solid carbon can exist as diamond and graphite. Compared to the molecular structure and chemical properties of diamond, graphite has
Correct
Diamond and graphite has different molecular structures. Therefore they have different chemical and physical properties.
Incorrect
Diamond and graphite has different molecular structures. Therefore they have different chemical and physical properties.
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Question 6 of 10
6. Question
Category: 4. Periodic TableWhich group 14 element is classified as a metal?
Correct
– image from http://www.ptable.com
Metalloids are B, Si, Ge, As, Sb, Te, Po, and At.
Al is the ONLY element that touches the line in your Reference Table that is a metal, all others are metalloids.
Metals can be found below the line – Al, Ga, In, Ti, Sn, Pb, Bi, etc (to the left of the line).
Non-metals can be found above the line or to the right – C, N, P, O, S, Se, Br, I, etc.Incorrect
– image from http://www.ptable.com
Metalloids are B, Si, Ge, As, Sb, Te, Po, and At.
Al is the ONLY element that touches the line in your Reference Table that is a metal, all others are metalloids.
Metals can be found below the line – Al, Ga, In, Ti, Sn, Pb, Bi, etc (to the left of the line).
Non-metals can be found above the line or to the right – C, N, P, O, S, Se, Br, I, etc.Hint
Use the Periodic Table and Reference Table S found after the Periodic Table in the Reference Sheet – to identify the Elements and Symbols.
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Question 7 of 10
7. Question
Category: 4. Periodic TableThe light emitted from a flame is produced when electrons in an excited state
Correct
As electrons in an excited state move to a lower energy levels, the release of energy in the form of electromagnetic radiation (light).
Incorrect
As electrons in an excited state move to a lower energy levels, the release of energy in the form of electromagnetic radiation (light).
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Question 8 of 10
8. Question
Category: 4. Periodic TableAn atom of which element has the greatest attraction for electrons in a chemical bond?
Correct
An atom’s attraction for electrons in a chemical bond is measured by its electronegativity. As the electronegativity increases, the attraction for electrons also increases. See Reference Table S for electronegativity values.
Incorrect
An atom’s attraction for electrons in a chemical bond is measured by its electronegativity. As the electronegativity increases, the attraction for electrons also increases. See Reference Table S for electronegativity values.
Hint
Reference Table S
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Question 9 of 10
9. Question
Category: 5. BondingWhich formula represents a polar molecule?
Correct
Molecules with polar bonds will be polar if their bonds lack symmetry.
Incorrect
Molecules with polar bonds will be polar if their bonds lack symmetry.
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Question 10 of 10
10. Question
Category: 5. BondingTwo categories of compounds are
Correct
Compounds may be classified according to the bonding of the atoms within a compound. if the atoms are ions, the compound is classified as ionic. If the bonds are covalent the compound is classified as molecular.
Incorrect
Compounds may be classified according to the bonding of the atoms within a compound. if the atoms are ions, the compound is classified as ionic. If the bonds are covalent the compound is classified as molecular.
C6.10 Chemistry Regents Exam Part A Questions 11-20
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Question 1 of 10
1. Question
Category: 5. BondingWhich type of bonding is found between atoms of solid cobalt?
Correct
Refer to the Periodic Table of Elements. Cobalt, Co atomic number 27, is a transition element and is therefore metallic.
Incorrect
Refer to the Periodic Table of Elements. Cobalt, Co atomic number 27, is a transition element and is therefore metallic.
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Question 2 of 10
2. Question
Category: 2 MatterWhich equation represents sublimation?
Correct
Sublimation is the phase change from solid to gas. The reverse process from gas to solid is called deposition.
Solid to liquid – melting
Liquid to gas – evaporation
Gas to Liquid – condensation
Liquid to Solid- freezing
Incorrect
Sublimation is the phase change from solid to gas. The reverse process from gas to solid is called deposition.
Solid to liquid – melting
Liquid to gas – evaporation
Gas to Liquid – condensation
Liquid to Solid- freezing
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Question 3 of 10
3. Question
Category: 2 MatterWhich sample of ethanol has particles with the highest average kinetic energy?
Correct
The average kinetic energy of the particles of a sample of matter is directly related to its temperature. The volume of the sample is irrelevant.
Incorrect
The average kinetic energy of the particles of a sample of matter is directly related to its temperature. The volume of the sample is irrelevant.
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Question 4 of 10
4. Question
Category: 8. SolutionsThe molarity of an aqueous solution of NaCl is defined as the
Correct
Use the concentration formula given on Reference Table T. Molarity is defined as the number of moles of solute per liter of solution.
Incorrect
Use the concentration formula given on Reference Table T. Molarity is defined as the number of moles of solute per liter of solution.
Hint
Reference Table T.
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Question 5 of 10
5. Question
A real gas behaves least like an ideal gas under the conditions of
Correct
Real gases behave least ideally when they are subject to intermolecular forces and the volume of the gas is no longer negligible. These conditions occur when the gas particles are made to move more slowly and allowed to approach each other more closely, that is under conditions of low temperature and high pressure.
ABC RULE
Ideal to Real ( I comes before R)
Pressure Increase or High ( P comes before T)
Temperature Decrease or Low ( T comes after P)
Incorrect
Real gases behave least ideally when they are subject to intermolecular forces and the volume of the gas is no longer negligible. These conditions occur when the gas particles are made to move more slowly and allowed to approach each other more closely, that is under conditions of low temperature and high pressure.
ABC RULE
Ideal to Real ( I comes before R)
Pressure Increase or High ( P comes before T)
Temperature Decrease or Low ( T comes after P)
Hint
Do not look at the answer choices first. Work out the conditions that an ideal gas would need to behave like a real gas. [ABC RULE]
Then read the question and try to understand what they are asking.
“Least” like an ideal gas therefore it is more like a ‘real’ gas.
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Question 6 of 10
6. Question
Category: 2 MatterWhich sample of matter can be separated into different substances by physical means?
Correct
Only mixtures can be separated into different substances by physical means.
Incorrect
Only mixtures can be separated into different substances by physical means.
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Question 7 of 10
7. Question
At STP, 1.0 liter of helium contains the same number of atoms as
Correct
Avogadro’s Hypothesis states that at a given temperature and pressure (STP in this question), equal volumes of gases will contain the same number of particles.
Incorrect
Avogadro’s Hypothesis states that at a given temperature and pressure (STP in this question), equal volumes of gases will contain the same number of particles.
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Question 8 of 10
8. Question
Which statement describes the particles of an ideal gas?
Correct
An ideal gas consists of particles that have negligible volumes. These particles also have mass; move in random, constant, straight-line motion; undergo perfect elastic collisions (energy is not lost from the system just transferred from one particle to the other); and have no attraction for each other, except during collisions.
Incorrect
An ideal gas consists of particles that have negligible volumes. These particles also have mass; move in random, constant, straight-line motion; undergo perfect elastic collisions (energy is not lost from the system just transferred from one particle to the other); and have no attraction for each other, except during collisions.
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Question 9 of 10
9. Question
Category: 9. Kinetics and EquilibriumA chemical reaction between iron atoms and oxygen molecules can only occur if
Correct
A chemical reaction occurs when the reacting particles are able to undergo effective collisions. An effective collision is one in which the colliding particles have sufficient kinetic energies and are oriented properly toward one another.
Incorrect
A chemical reaction occurs when the reacting particles are able to undergo effective collisions. An effective collision is one in which the colliding particles have sufficient kinetic energies and are oriented properly toward one another.
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Question 10 of 10
10. Question
Category: 9. Kinetics and EquilibriumGiven the equation representing a phase change at equilibrium:
H<sub>2</sub>O(s) ↔ H<sub>2</sub>O(l)
Which statement describes this equilibrium?
Correct
When a system reaches equilibrium, the rates of the forward and reverse reactions become equal.
30 Students are in your Chemistry Class.
CASE 1.
15 students are outside the room and 15 students are inside. When one enters one leaves, When two enters two leaves. This case is at equilibrium because there is always a constant number of students in the room 15, and there is always a constant number of students outside the room, 15. Coincidentally the number of students in the room and outside the room is equal – the situation does NOT need to have equal number to be at equilibrium.
CASE 2.
20 Students are outside the room and 10 students are inside the room. When one student enters one leaves, when two enters two leaves. The system is at equilibrium because there is a constant number of students outside the room 20, and there is a constant number of students inside the room 10. The number of students outside the room is NOT equal to the number of students inside the room yet the system is AT equilibrium.
Incorrect
When a system reaches equilibrium, the rates of the forward and reverse reactions become equal.
30 Students are in your Chemistry Class.
CASE 1.
15 students are outside the room and 15 students are inside. When one enters one leaves, When two enters two leaves. This case is at equilibrium because there is always a constant number of students in the room 15, and there is always a constant number of students outside the room, 15. Coincidentally the number of students in the room and outside the room is equal – the situation does NOT need to have equal number to be at equilibrium.
CASE 2.
20 Students are outside the room and 10 students are inside the room. When one student enters one leaves, when two enters two leaves. The system is at equilibrium because there is a constant number of students outside the room 20, and there is a constant number of students inside the room 10. The number of students outside the room is NOT equal to the number of students inside the room yet the system is AT equilibrium.
C6.10 Chemistry Regents Exam Part A Question 21-30
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Question 1 of 10
1. Question
Category: 12. Organic ChemistryA molecule of an organic compound contains at least one atom of
Correct
Organic compounds must contain at least one carbon atom. They may also contain chlorine, nitrogen, or oxygen atoms, the only essential element common to these compounds is carbon.
Incorrect
Organic compounds must contain at least one carbon atom. They may also contain chlorine, nitrogen, or oxygen atoms, the only essential element common to these compounds is carbon.
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Question 2 of 10
2. Question
Category: 9. Kinetics and EquilibriumIn a chemical reaction, the difference between the potential energy of the products and the potential energy of the reactants is equal to the
Correct
http://www.lakelandschools.us/lh/lburris/pages/kinetics.htm
The difference between the potential energy of the reactants and the products is equal to the heat of the reaction (ΔH).
( PE of Products – PE of Reactants = Heat of reaction)
If the PE of the products is greater than the PE reactants the ΔH is positive. (endothermic)
If the PE of the products is less than the PE of the reactants the ΔH is negative. (exothermic)
Incorrect
http://www.lakelandschools.us/lh/lburris/pages/kinetics.htm
The difference between the potential energy of the reactants and the products is equal to the heat of the reaction (ΔH).
( PE of Products – PE of Reactants = Heat of reaction)
If the PE of the products is greater than the PE reactants the ΔH is positive. (endothermic)
If the PE of the products is less than the PE of the reactants the ΔH is negative. (exothermic)
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Question 3 of 10
3. Question
Category: 12. Organic ChemistryA carbon-carbon triple bond is found in a molecule of
Correct
See Reference Table P, Q, and R. the presence of a carbon-carbon triple bond places a hydrocarbon in the alkyne family with a suffix of -yne at the end of its name.
Incorrect
See Reference Table P, Q, and R. the presence of a carbon-carbon triple bond places a hydrocarbon in the alkyne family with a suffix of -yne at the end of its name.
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Question 4 of 10
4. Question
Category: 11. Oxidation and ReductionWhich statement describes one characteristic of an operating electrolytic cell?
Correct
Electrolytic cells are electrochemical cells that use an external source of electrical energy in order to drive a nonspontaneous reduction-oxidation reaction.
Incorrect
Electrolytic cells are electrochemical cells that use an external source of electrical energy in order to drive a nonspontaneous reduction-oxidation reaction.
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Question 5 of 10
5. Question
Category: 11. Oxidation and ReductionWhich compound when dissolved in water is an Arrhenius acid?
Correct
An Arrhenius acid is defined as a substance that produce H+ ions as the only positive ion in an aqueous solution. See Reference Table K for a list of common Arrhenius acids, such as HCl.
Incorrect
An Arrhenius acid is defined as a substance that produce H+ ions as the only positive ion in an aqueous solution. See Reference Table K for a list of common Arrhenius acids, such as HCl.
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Question 6 of 10
6. Question
Category: 10. Acids and BasesAn acid can be defined as an
Correct
One alternate acid-base theory is based on H+ transfer. An acid is defined as an H+ donor.
Incorrect
One alternate acid-base theory is based on H+ transfer. An acid is defined as an H+ donor.
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Question 7 of 10
7. Question
Category: 13. Nuclear ChemistryWhich nuclear emission has no charge and no mass?
Correct
See Reference Table O. The two neutral particle on this table are gamma rays and neutrons. Gamma rays have no mass. [THE HULK]
Incorrect
See Reference Table O. The two neutral particle on this table are gamma rays and neutrons. Gamma rays have no mass. [THE HULK]
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Question 8 of 10
8. Question
Category: 10. Acids and BasesDuring which process can 10.0 milliliters of a 0.05 M HCl(aq) solution can be used to determine the unknown concentration of a given volume of NaOH(aq) solution?
Correct
Titration is the laboratory process that can be used to determine the concentration of an unknown solution (in this case NaOH(aq) by using a known volume of a solution whose concentration is known (such as HCl(aq).
Incorrect
Titration is the laboratory process that can be used to determine the concentration of an unknown solution (in this case NaOH(aq) by using a known volume of a solution whose concentration is known (such as HCl(aq).
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Question 9 of 10
9. Question
Category: 13. Nuclear ChemistryWhich radioisotope is matched with its decay mode?
Correct
Reference Table N. H-3 is the same as 3H.
Incorrect
Reference Table N. H-3 is the same as 3H.
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Question 10 of 10
10. Question
Category: 13. Nuclear ChemistryWhich reaction is accompanied by the release of the greatest amount of energy?
Correct
Nuclear reactions such as fission and fusion release far more greater energy than ordinary chemical reactions.
Incorrect
Nuclear reactions such as fission and fusion release far more greater energy than ordinary chemical reactions.
C6.10 Chemistry Regents Exam Part B Questions 31-40
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Question 1 of 10
1. Question
Category: 3. Atomic ConceptsThe total number of protons, electrons, and neutrons in each of four different atoms are shown in the table below.
Which two atoms are isotopes of the same element?
Correct
Isotopes of the same element must have the same atomic number, i.e., protons.
Incorrect
Isotopes of the same element must have the same atomic number, i.e., protons.
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Question 2 of 10
2. Question
Category: 5. BondingCorrect
Use the Periodic Table of elements. All Group 13 elements have 3 valance electrons. Lewis electron-dot diagrams display only the valance electrons of the atom.
Incorrect
Use the Periodic Table of elements. All Group 13 elements have 3 valance electrons. Lewis electron-dot diagrams display only the valance electrons of the atom.
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Question 3 of 10
3. Question
Category: 6. Formulas and EquationsWhich element forms a compound with chlorine with the general formula of MCl?
Correct
Use the Periodic Table of Elements. Chlorine (Cl atomic number 17) has an oxidation number of -1. In the compound MCl, the oxidation state of M must be +1.
Incorrect
Use the Periodic Table of Elements. Chlorine (Cl atomic number 17) has an oxidation number of -1. In the compound MCl, the oxidation state of M must be +1.
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Question 4 of 10
4. Question
Category: 1. Lab and Math SkillsA sample of an element has a mass of 34.261 grams and a volume of 3.8 cubic centimeters. To which number of significant figures should the calculated density of the sample be expressed?
Correct
When dividing two measured quantities, the answer should contain the same number of significant figures as the quantity with the smaller number of significant figures. The mass is expressed to 5 significant figures and the volume to 2. The answer must contain 2 significant figures.
– If you are adding or subtracting report your answer to the least number of decimal places.
Incorrect
When dividing two measured quantities, the answer should contain the same number of significant figures as the quantity with the smaller number of significant figures. The mass is expressed to 5 significant figures and the volume to 2. The answer must contain 2 significant figures.
– If you are adding or subtracting report your answer to the least number of decimal places.
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Question 5 of 10
5. Question
Category: 4. Periodic TableWhich characteristic both generally decrease when the elements in Period 3 on the Periodic Table are considered in order from left to right?
Correct
Use the Periodic Table of the Elements and Reference Table S. As one proceeds across Period 3 from Na to Ar, the properties of elements change from metal to metalloid to nonmetal to noble gas. Therefore, the metallic properties decrease. Table S reveals that the atomic radii of the eight successive elements all decrease from 190 pm to 88 pm.
Incorrect
Use the Periodic Table of the Elements and Reference Table S. As one proceeds across Period 3 from Na to Ar, the properties of elements change from metal to metalloid to nonmetal to noble gas. Therefore, the metallic properties decrease. Table S reveals that the atomic radii of the eight successive elements all decrease from 190 pm to 88 pm.
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Question 6 of 10
6. Question
Category: 6. Formulas and EquationsWhich formula is both a molecular and empirical formula?
Correct
The empirical formula of a compound is its molecular formula reduced to the simplest whole-number ratio possible.
Incorrect
The empirical formula of a compound is its molecular formula reduced to the simplest whole-number ratio possible.
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Question 7 of 10
7. Question
Category: 4. Periodic TableAn atom of argon in the ground state tends not to bond with an atom of a different element because the atom has
Correct
Use the Periodic Table of Elements. When atom bond, they generally complete a valence shell that will contain either 2 or electrons. Since an atom of argon (Ar, atomic number 18) is a noble gas and already has 8 valance electrons, it will not bond with another atom.
Incorrect
Use the Periodic Table of Elements. When atom bond, they generally complete a valence shell that will contain either 2 or electrons. Since an atom of argon (Ar, atomic number 18) is a noble gas and already has 8 valance electrons, it will not bond with another atom.
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Question 8 of 10
8. Question
Category: 5. BondingWhich formula represents a molecule having a nopolar covalent bond?
Correct
Use Reference Table S. In a nonpolar bond, the electronegativity difference should be as close as possible to 0. The electronegativity difference of the C-C bond is exactly 0.
“nonpolar covalent bond” – its is not about symmetry choice with methane CH4 is symmetrical and I would have selected this as my answer however the question asks which molecule has a nonpolar covalent ‘BOND’.
Incorrect
Use Reference Table S. In a nonpolar bond, the electronegativity difference should be as close as possible to 0. The electronegativity difference of the C-C bond is exactly 0.
“nonpolar covalent bond” – its is not about symmetry choice with methane CH4 is symmetrical and I would have selected this as my answer however the question asks which molecule has a nonpolar covalent ‘BOND’.
Hint
Read the question very carefully.
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Question 9 of 10
9. Question
Category: 8. SolutionsWhich compound has the lowest vapor pressure at 50ºC?
Correct
Use Reference Table H. At 50ºC, ethanoic acid, has the lowest vapor pressure. (and propanone has the highest)
Incorrect
Use Reference Table H. At 50ºC, ethanoic acid, has the lowest vapor pressure. (and propanone has the highest)
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Question 10 of 10
10. Question
Category: 9. Kinetics and EquilibriumGiven the potential energy diagram and equations representing the reaction between substances A and D:
According to Table I (as in India), substance G could be
Correct
The diagram in this question indicates that substance G has a higher potential energy than substances A and G. This reaction is endothermic and has a positive ΔH. Use Reference Table I (as in India).
Incorrect
The diagram in this question indicates that substance G has a higher potential energy than substances A and G. This reaction is endothermic and has a positive ΔH. Use Reference Table I (as in India).
C6.10 Chemistry Regents Exam Part B Questions 41-50
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Question 1 of 10
1. Question
A sample of gas confined in a cylinder with a movable piston is kept at constant pressure. The volume of the gas doubles when the temperature of the gas is changed from
Correct
Use the combined gas law equation on Reference Table T. At constant pressure the equation reduces to: V1/T1 = V2/T2
where the temperature is always measured in kelvins (K). If the Kelvin temperature doubles, the volume of the gas will double.
Incorrect
Use the combined gas law equation on Reference Table T. At constant pressure the equation reduces to: V1/T1 = V2/T2
where the temperature is always measured in kelvins (K). If the Kelvin temperature doubles, the volume of the gas will double.
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Question 2 of 10
2. Question
Category: 8. SolutionsAccording to Table F, which compound is soluble in water?
Correct
Reference Table F indicates that compounds containing the perchlorate ion are always soluble in water
Incorrect
Reference Table F indicates that compounds containing the perchlorate ion are always soluble in water
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Question 3 of 10
3. Question
Category: 9. Kinetics and EquilibriumGiven the equation representing a system at equilibrium:
N2(g) + 3H2(g)↔ 2NH3(g) + energy
Which change occur when the temperature of this system is decreased?
Correct
In the forward reaction, energy appears as a product, i.e., it is an exothermic reaction. If the temperature of the system is lowered, Le Chatelier’s principle predicts that the system will shift to the right in order to produce more heat energy. As a result, the concentration of both hydrogen and nitrogen will decrease and the concentration of ammonia will increase.
Incorrect
In the forward reaction, energy appears as a product, i.e., it is an exothermic reaction. If the temperature of the system is lowered, Le Chatelier’s principle predicts that the system will shift to the right in order to produce more heat energy. As a result, the concentration of both hydrogen and nitrogen will decrease and the concentration of ammonia will increase.
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Question 4 of 10
4. Question
Category: 12. Organic ChemistryCorrect
An unsaturated hydrocarbon contains only carbon and hydrogen with at least one double or triple bond between two adjacent carbon atoms.
Incorrect
An unsaturated hydrocarbon contains only carbon and hydrogen with at least one double or triple bond between two adjacent carbon atoms.
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Question 5 of 10
5. Question
Category: 11. Oxidation and ReductionCorrect
In a reduction half-reaction, electrons are gained and the oxidation number of the reduced substance is lowered. The correct answer choice indicates that 2 electrons are gained and that the oxidation number of Fe is lowered from +2 to 0.
Incorrect
In a reduction half-reaction, electrons are gained and the oxidation number of the reduced substance is lowered. The correct answer choice indicates that 2 electrons are gained and that the oxidation number of Fe is lowered from +2 to 0.
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Question 6 of 10
6. Question
Category: 11. Oxidation and ReductionWhich metal is more active than H2?
Correct
Use Reference Table J. Metals that are more active than Hydrogen lie above hydrogen on the table.
Incorrect
Use Reference Table J. Metals that are more active than Hydrogen lie above hydrogen on the table.
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Question 7 of 10
7. Question
Category: 11. Oxidation and ReductionGiven the balanced ionic equation representing the reaction in an operating voltaic cell.
Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s)
The flow of electrons through the external circuit in this cell is from the
Correct
According to the ionic equation, Zn is oxidized to Zn2+ and is the anode; Cu2+ is reduced to Cu and is the cathode. The electrons lost by the Zn electrode pass thought the external circuit and enter the Cu electrode.
Incorrect
According to the ionic equation, Zn is oxidized to Zn2+ and is the anode; Cu2+ is reduced to Cu and is the cathode. The electrons lost by the Zn electrode pass thought the external circuit and enter the Cu electrode.
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Question 8 of 10
8. Question
Category: 10. Acids and BasesWhich laboratory test result can be used to determine if KCl(s) is an electrolyte?
Correct
An electrolyte is a substance that conducts electricity dissolved in water. To test the conductivity of KCl, it must first be dissolved in water. Therefore KCl(aq) is needed.
Incorrect
An electrolyte is a substance that conducts electricity dissolved in water. To test the conductivity of KCl, it must first be dissolved in water. Therefore KCl(aq) is needed.
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Question 9 of 10
9. Question
Category: 10. Acids and BasesWhich compound is produced when HCl(aq) is neutralized by Ca(OH)2(aq)?
Correct
the balanced neutralization reaction between HCl(aq) and Ca(OH)2(aq) is shown below:
2HCl(aq) + Cu(OH)2 (aq) → CaCl2(aq) + 2H2O(l)Incorrect
the balanced neutralization reaction between HCl(aq) and Ca(OH)2(aq) is shown below:
2HCl(aq) + Cu(OH)2 (aq) → CaCl2(aq) + 2H2O(l) -
Question 10 of 10
10. Question
Category: 13. Nuclear ChemistryWhich nuclides are used to date the remains of a once-living organism?
Correct
See Reference Table-N. Carbon is a component of all living organisms. The radionuclide C-14 decays to stable C-12 and has a half-life of 5730 years. This combination is ideal for determining the age of once-living organisms, provided that they are not more than 20,000-25,000 years old.
Incorrect
See Reference Table-N. Carbon is a component of all living organisms. The radionuclide C-14 decays to stable C-12 and has a half-life of 5730 years. This combination is ideal for determining the age of once-living organisms, provided that they are not more than 20,000-25,000 years old.