Mrs. Le's Science Final

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Quizzes Created: 1 | Total Attempts: 194

Questions: 13 | Attempts: 194 | Updated: Mar 19, 2023

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Questions and Answers

1.

carbohydrates are a solution of...
- A.
  
  Carbon,hydrogen,oxygen
- B.
  
  Carbon and oxygen
- C.
  
  Nitrogen and carbon
Correct Answer
A. Carbon,hydrogen,oxygen

Explanation
Carbohydrates are organic compounds that consist of carbon, hydrogen, and oxygen atoms. These elements are present in the ratio of 1:2:1, respectively. Hence, the correct answer is carbon, hydrogen, oxygen.

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2.

A polymer is made of...
- A.
  
  Composites
- B.
  
  Carbon and oxygen
- C.
  
  A chain of smaller molecules
Correct Answer
C. A chain of smaller molecules

Explanation
A polymer is made of a chain of smaller molecules. Polymers are large molecules that are formed by repeating units of smaller molecules called monomers. These monomers join together through chemical bonds to form long chains, creating the polymer. This chain-like structure gives polymers their unique properties and allows them to have a wide range of applications in various industries.

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3.

Acids are usually are...
- A.
  
  Sour, produces OH- ions in a solution, turns blue litmus paper red, and are corrosive
- B.
  
  Sour, produces H+ ions in a solution, turns red litmus paper blue, and are corrosive
- C.
  
  Sour, produces H+ ions in a solution, turns blue litmus paper red, and are corrosive
Correct Answer
C. Sour, produces H+ ions in a solution, turns blue litmus paper red, and are corrosive

Explanation
Acids are typically characterized by their sour taste, ability to produce H+ ions in a solution, ability to turn blue litmus paper red, and their corrosive nature.

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4.

Carbon has 3 valence electrons.
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
Carbon actually has 4 valence electrons. Valence electrons are the electrons in the outermost energy level of an atom, and carbon is located in group 14 of the periodic table, which means it has 4 valence electrons. These valence electrons are involved in forming chemical bonds with other atoms, allowing carbon to form a wide variety of compounds. Therefore, the correct answer is False.

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5.

A neutral substance has a Ph scale of

Correct Answer
7
Seven
seven

Explanation
A neutral substance has a pH scale of 7. The pH scale is a measure of how acidic or basic a substance is. A pH of 7 indicates that the substance is neither acidic nor basic, but rather neutral. This means that the concentration of hydrogen ions (H+) and hydroxide ions (OH-) in the substance is equal, resulting in a balanced pH level.

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4
6.

Rings, straight lines, and branched structures describe..
- A.
  
  Nanotubes
- B.
  
  The structural formula of hydrocarbons
- C.
  
  The structural formula of Carbohydrates
Correct Answer
B. The structural formula of hydrocarbons

Explanation
The given options, rings, straight lines, and branched structures, are commonly used to represent the structural formula of hydrocarbons. Hydrocarbons are organic compounds composed of only hydrogen and carbon atoms. These structures are used to depict the arrangement of atoms and bonds in hydrocarbon molecules, providing important information about their chemical properties and behavior. Nanotubes and carbohydrates have different structural characteristics and are not typically represented using these specific structures.

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7.

Check the four pure forms of carbon
- A.
  
  Nanotube, fullerene,diamond, and graphite
- B.
  
  Carbohydrates, proteins, fats, and nucleic acid
- C.
  
  Neither
Correct Answer
A. Nanotube, fullerene,diamond, and grapHite

Explanation
The correct answer is "Nanotube, fullerene, diamond, and graphite". These are the four pure forms of carbon. Nanotubes are cylindrical structures made of carbon atoms, fullerene is a molecule composed entirely of carbon, diamond is a crystal form of carbon, and graphite is a soft, black, and flaky form of carbon. Carbohydrates, proteins, fats, and nucleic acids are not pure forms of carbon, but rather different types of organic compounds that contain carbon along with other elements.

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8.

What are monomers?
- A.
  
  Larger molecules that make up smaller molecules
- B.
  
  Polymers
- C.
  
  Small molecules that make up larger molecules
Correct Answer
C. Small molecules that make up larger molecules

Explanation
Monomers are small molecules that combine together through chemical reactions to form larger molecules called polymers. These small molecules act as building blocks and undergo polymerization to create more complex structures. Therefore, the correct answer is "small molecules that make up larger molecules."

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9.

Hydrocarbons are made up of...
- A.
  
  Carbon
- B.
  
  Hydrogen
- C.
  
  Both
Correct Answer
C. Both

Explanation
Hydrocarbons are compounds composed of carbon and hydrogen atoms. They are organic molecules that form the basis of many important substances such as fossil fuels, natural gas, and petroleum. The presence of both carbon and hydrogen in hydrocarbons allows for a wide variety of structures and properties, making them essential in various industries and everyday life.

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10.

Bases are usually
- A.
  
  Slippery, produces OH- ions in a solution, bitter, and turn red litmus paper blue
- B.
  
  Slippery, produces OH+ ions in a solution, bitter, and turn red litmus paper blue
- C.
  
  Slippery, produces OH- ions in a solution, bitter, and turn red litmus paper red
Correct Answer
A. Slippery, produces OH- ions in a solution, bitter, and turn red litmus paper blue

Explanation
Bases are typically characterized by their slippery texture, ability to produce OH- ions in a solution, bitter taste, and ability to turn red litmus paper blue.

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11.

Carbon can bond with itself
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
Carbon can bond with itself through a process called covalent bonding. This occurs when carbon atoms share electrons with each other, forming strong bonds. This ability to form multiple bonds allows carbon to create a wide variety of complex molecules, including the building blocks of life such as carbohydrates, proteins, and nucleic acids. This unique property of carbon is fundamental to organic chemistry and is one of the reasons why carbon-based compounds are so diverse and abundant in nature.

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12.

Are you going to pass the quiz?
- A.
  
  No
- B.
  
  Pass I will, pass i must
- C.
  
  Yes
Correct Answer
B. Pass I will, pass i must

Explanation
The given response "Pass I will, pass I must" is a confident statement indicating the determination and strong belief of the person in passing the quiz. It implies that the person is determined to succeed and will do whatever it takes to achieve their goal of passing the quiz. The response reflects a positive mindset and determination to overcome any obstacles or challenges that may come their way.

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Current Version
Mar 19, 2023

Quiz Edited by
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Jan 16, 2014

Quiz Created by
Profquiz

Mrs. Le's Science Final

carbohydrates are a solution of...

A polymer is made of...

Acids are usually are...

Carbon has 3 valence electrons.

A neutral substance has a Ph scale of

Rings, straight lines, and branched structures describe..

Check the four pure forms of carbon

What are monomers?

Hydrocarbons are made up of...

Bases are usually

Carbon can bond with itself

Are you going to pass the quiz?