How can a redox reaction be balanced in an acidic medium?

Positive H ions and water are added to half-reaction

Negative H ions and Salt are added to half-reaction

Positive H ions and Limestone are added to half-reaction

Negative H ions and water are added to half-reaction

Intermediate Level: Chemistry Quiz For 11th Grade!

Reviewed by Zohra Sattar Waxali

Zohra Sattar Waxali, PhD (Chemistry) |

Chemistry

Review Board Member

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.

, PhD (Chemistry)

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Intermediate Level: Chemistry Quiz For 11th Grade! - Quiz

Chemistry is a branch of science that deals with the study of matter concerning what it consists of, what its properties are, and how it changes when under varying pressures, temperatures, and/or chemical reactions. The study of chemistry is very important if we are to understand the natural world around us. Are you an 11th-grade chemistry student? Then this quiz is for you!

11th Grade Chemistry Questions and Answers

1.

Which branch of chemistry studies and uses instruments and methods used to separate, identify, and quantify matter?
- A.
  
  Inorganic chemistry
- B.
  
  Analytical Chemistry
- C.
  
  Giovenmetry
- D.
  
  Calorimetry
Correct Answer
B. Analytical Chemistry

Explanation
Analytical chemistry is the branch of chemistry that studies and uses instruments and methods to separate, identify, and quantify matter. It focuses on analyzing the composition and properties of substances and developing techniques to determine their concentration or purity. This field plays a crucial role in various industries such as pharmaceuticals, environmental monitoring, and forensic science. It involves using various techniques like chromatography, spectroscopy, and electrochemistry to analyze samples and provide accurate and reliable results.

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0
2.

How many types of chemical analysis are known?
- A.
  
  2
- B.
  
  4
- C.
  
  7
- D.
  
  6
Correct Answer
A. 2

Explanation
There are only two types of chemical analysis known: qualitative and quantitative. Quantitative Analysis involves determining the amount or concentration of a substance in a sample. Qualitative Analysis focuses on identifying the components or properties of a substance without necessarily determining their quantity.

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3.

In organic chemistry, which of these is involved in the study of chemical structures?
- A.
  
  Chemical properties
- B.
  
  Reaction rate
- C.
  
  Physical properties
- D.
  
  Chemical composition
Correct Answer
D. Chemical composition

Explanation
Chemical composition is involved in the study of chemical structures in organic chemistry. Chemical composition refers to the arrangement, type, and ratio of atoms in a molecule. By understanding the chemical composition of a compound, organic chemists can determine the connectivity and arrangement of atoms, which is crucial for understanding the structure and properties of organic molecules. This information helps in predicting the behavior and reactivity of organic compounds, allowing chemists to design and synthesize new molecules with specific properties.

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4.

Which of these is not in the range of chemicals studied in organic chemistry?
- A.
  
  Halogens
- B.
  
  Metallic compounds
- C.
  
  Hydrocarbon
- D.
  
  Transition metal
Correct Answer
B. Metallic compounds

Explanation
Organic chemistry is the branch of chemistry that deals with the study of carbon compounds. Carbon compounds that contain halogens (such as chlorine, fluorine, bromine, etc.), hydrocarbons (compounds composed of hydrogen and carbon), and nonmetals. Metallic compounds are typically studied in inorganic chemistry but they may be used in various organic chemistry and biochemistry reactions.

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1
0
5.

What is the term given to the speed at which reactants change into products?
- A.
  
  Chemical production
- B.
  
  Chemical change
- C.
  
  Reaction rate
- D.
  
  Catalyst
Correct Answer
C. Reaction rate

Explanation
The term given to the speed at which reactants change products is called reaction rate. Reaction rate refers to the rate at which a chemical reaction takes place and is typically measured in terms of the change in concentration of reactants or products per unit of time. It is an important factor in understanding and controlling chemical reactions, as it determines how quickly reactants are consumed and products are formed.

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1
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6.

What is the value of Avogadro's constant?
- A.
  
  6.02214085×10³ mol⁻¹
- B.
  
  6.022140857×10²³ mol⁻¹
- C.
  
  6.922140857×10³ mol⁻¹
- D.
  
  8.02214085×10²³ mol⁻¹
Correct Answer
B. 6.022140857×10²³ mol⁻¹

Explanation
Avogadro's constant is a fundamental constant in chemistry and physics that represents the number of atoms or molecules in one mole of a substance. The value of Avogadro's constant is approximately 6.022140857×10^23 mol−1. This means that there are approximately 6.022140857×10^23 atoms or molecules in one mole of any substance.

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0
1
7.

When an electron is gained, what is known to have happened?
- A.
  
  Addition
- B.
  
  Oxidation
- C.
  
  Reduction
- D.
  
  Electron transfer
Correct Answer
C. Reduction

Explanation
The term given to the speed at which reactants change products is called reaction rate. Reaction rate refers to the rate at which a chemical reaction takes place and is typically measured in terms of the change in concentration of reactants or products per unit of time. It is an important factor in understanding and controlling chemical reactions, as it determines how quickly reactants are consumed and products are formed.

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2
0
8.

What is the Molecule that loses an electron called?
- A.
  
  Oxidant
- B.
  
  Reductant
- C.
  
  Host
- D.
  
  Loser
Correct Answer
B. Reductant

Explanation
A molecule that loses an electron is called a reductant. In a chemical reaction, a reductant donates electrons to another molecule, causing the reductant to become oxidized Therefore, the correct answer is reductant.

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2
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9.

How can a redox reaction be balanced in an acidic medium?
- A.
  
  Negative H ions and Salt are added to half-reaction
- B.
  
  Positive H ions and Limestone are added to half-reaction
- C.
  
  Positive H ions and water are added to half-reaction
- D.
  
  Negative H ions and water are added to half-reaction
Correct Answer
C. Positive H ions and water are added to half-reaction

Explanation
In an acidic medium, positive H ions and water are added to the half-reaction in order to balance a redox reaction. This is because in an acidic solution, the reaction takes place in the presence of excess H+ ions. By adding positive H ions to the half-reaction, the number of H atoms on both sides of the equation can be balanced. Water is also added to ensure that the number of O atoms is balanced. This process allows for the overall equation to be balanced in terms of both mass and charge.

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10.

What is the charge of an atom?
- A.
  
  Negative
- B.
  
  Positive
- C.
  
  Neutral
- D.
  
  All of the above
Correct Answer
C. Neutral

Explanation
The charge of an atom refers to the electrical charge it carries. In the context of this question, the correct answer is "Neutral" because it means that the atom has no net charge. This means that the number of protons with a positive charge is equal to the number of electrons with a negative charge, resulting in a balanced charge.

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Zohra Sattar Waxali |PhD (Chemistry) |

Chemistry

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Expert Reviewed by
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Apr 25, 2019

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Gregorynaomi

Intermediate Level: Chemistry Quiz For 11th Grade!

11th Grade Chemistry Questions and Answers

Which branch of chemistry studies and uses instruments and methods used to separate, identify, and quantify matter?

How many types of chemical analysis are known?

In organic chemistry, which of these is involved in the study of chemical structures?

Which of these is not in the range of chemicals studied in organic chemistry?

What is the term given to the speed at which reactants change into products?

What is the value of Avogadro's constant?

When an electron is gained, what is known to have happened?

What is the Molecule that loses an electron called?

How can a redox reaction be balanced in an acidic medium?

What is the charge of an atom?