Chemistry Quiz -Level 2

2.

What is the approximate heat of vaporization of water at its boiling point?

49 Kj
4.186 Kj
333.7 Kj
2.1 Kj

Correct Answer

A. 333.7 Kj

Explanation

The approximate heat of vaporization of water at its boiling point is 333.7 Kj. This is the amount of heat energy required to convert one mole of liquid water into vapor at its boiling point, without changing its temperature.

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3.

Which element was the first ever artificially created?

Curium
Technetium
Berkelium
Americium

Correct Answer

A. Technetium

Explanation

Technetium was the first ever artificially created element. It was discovered in 1937 by Italian physicist Emilio Segrè and his team. They bombarded molybdenum with deuterons in a cyclotron, creating technetium-97. This marked the first successful synthesis of an element that does not occur naturally on Earth. Technetium is a silvery-gray metal and is commonly used in medical imaging, particularly in nuclear medicine scans. Its discovery was significant as it demonstrated that elements could be created through artificial means, expanding our understanding of the periodic table.

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4.

What is the molecular geometry of the molecule sulfur hexafluoride?

Tetrahedral Pyrimidal
Trigonal Planar
Trigonal Bipyrimidal
Octahedral

Correct Answer

A. Octahedral

Explanation

The correct answer is Octahedral. This is because sulfur hexafluoride (SF6) has six fluorine atoms bonded to a central sulfur atom. The molecule has a total of six electron pairs around the sulfur atom, resulting in an octahedral geometry. In an octahedral arrangement, the six electron pairs are spread out as far as possible, creating a symmetrical shape with bond angles of 90 degrees.

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5.

Which is more abundant in the earth's crust?

Mercury
Gold
Uranium
Silver

Correct Answer

A. Uranium

Explanation

Uranium is more abundant in the earth's crust compared to the other elements listed. Uranium is a naturally occurring element and is relatively common in the earth's crust, with an average abundance of about 2.8 parts per million. On the other hand, gold, silver, and mercury are much less abundant in the earth's crust. Gold and silver are considered precious metals and are found in much lower concentrations, while mercury is a relatively rare element in the earth's crust. Therefore, uranium is the most abundant element among the options provided.

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6.

What solution contains the same ratio of chemical constituents after it is distilled?

Azeotropic Mixture
Brownian Mixture
Colloidal Mixture
Homogemous Solution

Correct Answer

A. Azeotropic Mixture

Explanation

An azeotropic mixture is a solution that contains the same ratio of chemical constituents after it is distilled. This means that even after distillation, the composition of the solution remains constant. In other words, the components of the solution have a specific ratio that cannot be altered by distillation. Therefore, an azeotropic mixture is the correct answer to the question.

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7.

Who demonstrated that the rate of diffusion of a gas is inversely proportional to the square root of its density?

Graham
Charles
Gay Lussac
Boyle

Correct Answer

A. Graham

Explanation

Graham demonstrated that the rate of diffusion of a gas is inversely proportional to the square root of its density.

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8.

Which will have the smallest increase in temperature for the same amount of heat?

Copper
Iron
Glass
Water

Correct Answer

A. Water

Explanation

Water will have the smallest increase in temperature for the same amount of heat because it has a high specific heat capacity. This means that it requires a large amount of heat energy to raise its temperature compared to the other substances listed. Copper, iron, and glass have lower specific heat capacities, so they will experience a greater increase in temperature for the same amount of heat.

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9.

When a CFC molecule is struck by UV radiation, what kind of cleavage gives rise to the chlorine free radical?

Bilateral Cleavage
Unilateral Cleavage
Homolytic Cleavage
Heterolytic Cleavage

Correct Answer

A. Homolytic Cleavage

Explanation

Homolytic cleavage is the process in which a covalent bond is broken evenly, with each atom receiving one of the shared electrons. When a CFC molecule is struck by UV radiation, the energy is absorbed by the molecule, causing the bond between the carbon and chlorine atoms to break. This results in the formation of a chlorine free radical, with each atom retaining one electron from the original bond. Therefore, homolytic cleavage is the type of cleavage that gives rise to the chlorine free radical in this scenario.

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10.

What kind of cell has a negative EMF and a positive Gibbs free energy?

Its Impossible To Have Such A Combination
Electrolytic Cell
Galvanic Cell
Danielle Cell

Correct Answer

A. Electrolytic Cell

Explanation

An electrolytic cell is the correct answer because it is the only type of cell that can have a negative EMF and a positive Gibbs free energy. In an electrolytic cell, electrical energy is used to drive a non-spontaneous chemical reaction, which results in a negative EMF. The positive Gibbs free energy indicates that the reaction is non-spontaneous and requires an input of energy. Galvanic cells, on the other hand, have a positive EMF and a negative Gibbs free energy, indicating that they are spontaneous and release energy. The Danielle cell is a type of galvanic cell, so it cannot have a negative EMF and a positive Gibbs free energy.

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11.

Which two transition metals do not exhibit diamagnetism?

Zn And Sc
Zr And Mo
Ni And Y
Rh And CD

Correct Answer

A. Zn And Sc

Explanation

Zinc (Zn) and Scandium (Sc) are the two transition metals that do not exhibit diamagnetism. Diamagnetic substances have all of their electrons paired up in their atomic or molecular orbitals, resulting in no net magnetic moment. Both Zn and Sc have completely filled d orbitals, which means all of their electrons are paired up and there is no unpaired electron to generate a magnetic field. Therefore, they do not show any magnetic properties and are considered diamagnetic.

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12.

What was the fifth unearthly element from the days of Aristotle?

Dark Matter
Soul
Heart
Quintessence

Correct Answer

A. Quintessence

Explanation

Quintessence was considered the fifth unearthly element from the days of Aristotle. In ancient Greek philosophy, it was believed to be a substance that made up the celestial bodies and existed beyond the four earthly elements of earth, air, fire, and water. Quintessence was thought to be pure and incorruptible, representing the divine and eternal. This concept of quintessence was influential in early scientific and philosophical discussions about the nature of the universe.

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13.

What is the name of the temperature at which Helium I becomes Helium II?

Lambda Point
Equivalence Point
Critical Point
Superfluid Point

Correct Answer

A. Lambda Point

Explanation

The name of the temperature at which Helium I becomes Helium II is the Lambda Point.

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14.

Which element was named after the Greek mortal woman who claimed her 12 children were better than the goddess Leto's two children?

Europium
Niobium
Lutetium
Ruthenium

Correct Answer

A. Niobium

Explanation

Niobium was named after the Greek mortal woman, Niobe, who boasted that her 12 children were superior to the two children of the goddess Leto. As a result, Leto's children, Apollo and Artemis, were sent to punish Niobe, causing the death of all her children. The element Niobium was named in reference to this Greek mythological story.

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15.

Which of the following ionic solids would you expect to have the highest lattice energy?

K2o
Nacl
Mgo
Becl2

Correct Answer

A. Mgo

Explanation

MgO would be expected to have the highest lattice energy because it consists of a smaller cation (Mg2+) and a smaller anion (O2-) compared to the other options. The smaller the ions, the stronger the electrostatic attraction between them, resulting in a higher lattice energy.

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Chemistry Quiz -level 2

In an ethyne molecule, what is the hybridization of each of the carbons?

Quiz Preview

What is the approximate heat of vaporization of water at its boiling point?

Which element was the first ever artificially created?

What is the molecular geometry of the molecule sulfur hexafluoride?

Which is more abundant in the earth's crust?

What solution contains the same ratio of chemical constituents after it is distilled?

Who demonstrated that the rate of diffusion of a gas is inversely proportional to the square root of its density?

Which will have the smallest increase in temperature for the same amount of heat?

When a CFC molecule is struck by UV radiation, what kind of cleavage gives rise to the chlorine free radical?

What kind of cell has a negative EMF and a positive Gibbs free energy?

Which two transition metals do not exhibit diamagnetism?

What was the fifth unearthly element from the days of Aristotle?

What is the name of the temperature at which Helium I becomes Helium II?

Which element was named after the Greek mortal woman who claimed her 12 children were better than the goddess Leto's two children?

Which of the following ionic solids would you expect to have the highest lattice energy?