Chemistry Concepts Quiz: Trivia!

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Zohra Sattar Waxali, PhD (Chemistry) |

Chemistry

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Dr. Zohra Sattar Waxali earned her doctorate in chemistry and biochemistry from Northwestern University, specializing in the metallomes of cardiac cells and stem cells, and their impact on biological function. Her research encompasses the development of arsenoplatin chemotherapeutics, stapled peptide estrogen receptor inhibitors, and antimicrobial natural products. With her expertise, Dr. Waxali ensures the accuracy and relevance of our chemistry quizzes, contributing to a comprehensive understanding of chemical principles and advancements in the field.

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Get ready to test your understanding of essential chemistry principles with our engaging Chemistry Concepts Quiz! Whether you're a student preparing for an exam or simply looking to reinforce your knowledge, this quiz is designed to challenge and educate in equal measure.

Dive into topics such as chemical reactions, atomic structure, periodic trends, and more, all in a convenient and accessible format. Each question is crafted to assess your comprehension and provide valuable insights into core concepts. With clear explanations and instant feedback, you'll have the opportunity to learn as you go, solidifying your understanding with every answer.

Whether you're Read morea chemistry enthusiast or just starting your journey, our Concepts Quiz is the perfect way to expand your knowledge and boost your confidence. Take the quiz today and unlock the secrets of chemistry!

Chemistry Concepts Questions and Answers

1.

The major portion of natural gas is:
- A.
  
  Ethane
- B.
  
  Propane
- C.
  
  Butane
- D.
  
  Methane
Correct Answer
D. Methane

Explanation
Methane is the major portion of natural gas because it typically makes up around 70-90% of the composition of natural gas. It is the simplest hydrocarbon molecule, consisting of one carbon atom bonded to four hydrogen atoms. Methane is highly flammable and is the main component responsible for the energy content of natural gas. It is also the primary greenhouse gas emitted by human activities, such as the production and use of fossil fuels.

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2
0
2.

Carbon is likely to bond to other inorganic elements through
- A.
  
  Ionic bonds
- B.
  
  Metallic bonds
- C.
  
  Covalent bonds
- D.
  
  None of these
Correct Answer
C. Covalent bonds

Explanation
Inorganic compounds are typically formed through covalent bonds. Covalent bonds involve the sharing of electrons between atoms, which allows for the formation of stable compounds. In contrast, ionic bonds involve the transfer of electrons between atoms, and metallic bonds involve the delocalization of electrons in a metal lattice. Since carbon is a nonmetal, it is more likely to form covalent bonds with other elements in inorganic compounds. Therefore, the correct answer is covalent bonds.

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3.

Which of the following is an aromatic compound?
- A.
  
  Propanol
- B.
  
  Cyclohexane
- C.
  
  Acetone
- D.
  
  Benzene
Correct Answer
D. Benzene

Explanation
Benzene is an aromatic compound because it contains a ring of six carbon atoms with alternating single and double bonds. This structure gives benzene its characteristic stability and resonance, making it highly reactive and aromatic in nature. Propanol, cyclohexane, and acetone are not aromatic compounds as they do not possess a conjugated ring system like benzene.

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4.

There are a few homologous series of compounds. The existence of homologous series is due to:
- A.
  
  Functional groups
- B.
  
  Cracking
- C.
  
  Isomerism
- D.
  
  Polymerization
Correct Answer
A. Functional groups

Explanation
The existence of homologous series is due to the presence of a functional group. Homologous series refers to a group of compounds that have similar chemical properties and a gradual increase in the number of carbon atoms in their structure. The functional group is responsible for determining the chemical behavior and properties of the compounds within the series. It provides a common characteristic that allows for the classification and comparison of these compounds. Cracking, isomerism, and polymerization are not directly related to the existence of homologous series.

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5.

Which of the following compounds is heterocyclic?
- A.
  
  Pyridine
- B.
  
  Pyrrole
- C.
  
  Thiophene
- D.
  
  All of above
Correct Answer
D. All of above

Explanation
Pyridine is a heterocyclic compound because it contains a ring structure with at least one heteroatom, in this case, a nitrogen atom. Heterocyclic compounds are organic compounds that have rings containing atoms other than carbon, such as nitrogen, oxygen, or sulfur. Pyrrole and thiophene are also heterocyclic compounds because they contain nitrogen and sulfur atoms, respectively, in their ring structures. Therefore, the correct answer is All of above .

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6.

Select from the following one, which is an alcohol:
- A.
  
  CH₃CH₂OH
- B.
  
  CH₃OCH₃
- C.
  
  CH₃COOH
- D.
  
  CH₃CH₂Br
Correct Answer
A. CH₃CH₂OH

Explanation
The correct answer is CH3CH2OH. This compound is known as ethanol, which is a type of alcohol. It is formed by the combination of two carbon atoms, six hydrogen atoms, and one oxygen atom. Ethanol is commonly found in alcoholic beverages and is used as a solvent, fuel, and in the production of various chemicals.

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7.

Lassaigne’s solution is prepared for the detection of nitrogen, sulfur, and halogens in organic compounds. Which metal is used for the reaction with the organic compound?
- A.
  
  Aluminium
- B.
  
  Sodium
- C.
  
  Iron
- D.
  
  Copper
Correct Answer
B. Sodium

Explanation
Lassaigne’s solution is a reagent used for the detection of nitrogen, sulfur, and halogens in organic compounds. In this case, the metal used for the reaction with the organic compound is sodium. Sodium can react with certain organic compounds to form specific products or undergo specific reactions that help in the identification or detection of elements present in the compound.

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8.

When AgNO3 is added to Lassaigne’s solution, which color change indicates the presence of r iodine?
- A.
  
  Blue
- B.
  
  Violet
- C.
  
  Green
- D.
  
  Deep yellow
Correct Answer
D. Deep yellow

Explanation
When silver nitrate (AgNO3) is added to Lassaigne's solution, which typically contains compounds like sodium, potassium, and sulfur, a deep yellow color can form due to the presence of iodine. This reaction occurs because silver ions (Ag+) react with any halide ions present in the solution, including iodide ions (I-).

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9.

How many carbon atoms does the simplest molecule of a buckyball contain?
- A.
  
  20
- B.
  
  8
- C.
  
  60
- D.
  
  100
Correct Answer
C. 60

Explanation
The correct answer is 60 because a buckyball is a spherical fullerene molecule made entirely of carbon atoms. It consists of 60 carbon atoms arranged in a pattern of hexagons and pentagons, similar to a soccer ball. Therefore, the simplest molecule of buckyball contains 60 carbon atoms.

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10.

If a molecule contains more than one functional group it is known as:
- A.
  
  Derivatives
- B.
  
  Polyfunctional
- C.
  
  Heterocyclic
- D.
  
  None
Correct Answer
B. Polyfunctional

Explanation
A molecule that contains more than one functional group is known as polyfunctional. This means that the molecule has multiple reactive sites, allowing it to undergo various chemical reactions and participate in multiple types of interactions. This term is used to describe compounds that have multiple functional groups, such as alcohols, amines, carboxylic acids, and others. These functional groups can greatly influence the properties and reactivity of the molecule, making it versatile in different chemical processes.

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Zohra Sattar Waxali |PhD (Chemistry) |

Chemistry

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Mar 10, 2021

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Chemistry Concepts Quiz: Trivia!

Chemistry Concepts Questions and Answers

The major portion of natural gas is:

Carbon is likely to bond to other inorganic elements through

Which of the following is an aromatic compound?

There are a few homologous series of compounds. The existence of homologous series is due to:

Which of the following compounds is heterocyclic?

Select from the following one, which is an alcohol:

Lassaigne’s solution is prepared for the detection of nitrogen, sulfur, and halogens in organic compounds. Which metal is used for the reaction with the organic compound?

When AgNO3 is added to Lassaigne’s solution, which color change indicates the presence of r iodine?

How many carbon atoms does the simplest molecule of a buckyball contain?

If a molecule contains more than one functional group it is known as: