Chemistry

Chemical Reactions and Processes

626 Questions

Chemical reactions and processes questions cover the transformation of substances through electrolysis, thermal decomposition, and catalysis. Key areas include identifying gas evolution, balancing chemical equations, and understanding industrial chemical applications. This general chemistry topic is a staple in the science sections of multiple competitive examinations.

Thermal decompositionElectrolysis processGas evolution reactionsHeterogeneous catalystsFuel cell components

Chemical Reactions and Processes Questions

Multiple choice

Which of the following is NOT a common type of reactor used in chemical processes?

  1. Batch reactor

  2. Continuous reactor

  3. Semi-batch reactor

  4. Fluidized bed reactor
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Fluidized bed reactors are not as commonly used as batch, continuous, or semi-batch reactors in chemical processes.

Multiple choice

In etching, the design is created by using a chemical solution to dissolve areas of a metal plate. What is the name of the chemical solution used in this process?

  1. Nitric acid

  2. Hydrochloric acid

  3. Sulfuric acid

  4. Acetic acid
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Nitric acid is the most commonly used chemical solution in etching. It is used to dissolve areas of a metal plate, creating the design.

Multiple choice

What is the role of plasma in plasma-enhanced chemical vapor deposition (PECVD)?

  1. To generate reactive species

  2. To create an electric field

  3. To ionize gas molecules

  4. To produce heat
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In PECVD, plasma is used to generate reactive species that participate in chemical reactions, enabling the deposition of thin films with specific properties.

Multiple choice

Which of the following is an example of a chemical process that has been made inherently safer?

  1. The Haber process for producing ammonia.

  2. The Ostwald process for producing nitric acid.

  3. The Solvay process for producing soda ash.

  4. All of the above.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The Haber process, the Ostwald process, and the Solvay process have all been modified over time to make them inherently safer. These modifications have included using less hazardous chemicals, operating at lower temperatures and pressures, and improving containment and control measures.

Multiple choice

What is the concept of 'process intensification' in inherently safer chemistry?

  1. Designing chemical processes to operate at smaller scales and with reduced energy consumption.

  2. Designing chemical processes to operate at larger scales and with increased energy consumption.

  3. Designing chemical processes to operate at ambient conditions.

  4. Designing chemical processes to operate at extreme conditions.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Process intensification in inherently safer chemistry involves designing chemical processes to operate at smaller scales and with reduced energy consumption, thereby reducing the potential for accidents and releases and improving efficiency.

Multiple choice

What is the process by which material is removed from a surface by a chemical reaction with a plasma called?

  1. Sputtering

  2. Deposition

  3. Etching

  4. Erosion
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Etching is the process by which material is removed from a surface by a chemical reaction with a plasma.

Multiple choice

What is the term used to describe the conversion of one substance into another?

  1. Transformation

  2. Transmutation

  3. Reaction

  4. Decomposition
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Transformation is the general term used to describe the conversion of one substance into another.

Multiple choice

What is the term used to describe a chemical reaction in which a substance reacts with water to produce heat and a gas?

  1. Hydrolysis

  2. Decomposition

  3. Single-Replacement

  4. Double-Replacement
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hydrolysis is the term used to describe a chemical reaction in which a substance reacts with water to produce heat and a gas.

Multiple choice

What is the term used to describe a chemical reaction in which a substance reacts with an acid to produce a salt and water?

  1. Neutralization

  2. Decomposition

  3. Single-Replacement

  4. Double-Replacement
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Neutralization is the term used to describe a chemical reaction in which a substance reacts with an acid to produce a salt and water.

Multiple choice

What is the term used to describe a chemical reaction in which a substance reacts with a base to produce a salt and water?

  1. Neutralization

  2. Decomposition

  3. Single-Replacement

  4. Double-Replacement
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Neutralization is the term used to describe a chemical reaction in which a substance reacts with a base to produce a salt and water.

Multiple choice

What is the term used to describe a chemical reaction in which a substance reacts with a metal to produce a salt and hydrogen gas?

  1. Oxidation

  2. Reduction

  3. Single-Replacement

  4. Double-Replacement
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Single-Replacement is the term used to describe a chemical reaction in which a substance reacts with a metal to produce a salt and hydrogen gas.

Multiple choice

What is the term used to describe a chemical reaction in which a substance reacts with a non-metal to produce a salt and a gas other than hydrogen?

  1. Oxidation

  2. Reduction

  3. Single-Replacement

  4. Double-Replacement
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Single-Replacement is the term used to describe a chemical reaction in which a substance reacts with a non-metal to produce a salt and a gas other than hydrogen.

Multiple choice

Which Green Chemistry principle advocates for the use of catalysts in chemical reactions?

  1. Atom Economy

  2. Catalytic Processes

  3. Prevention of Waste

  4. Design for Degradation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The Catalytic Processes principle emphasizes the use of catalysts to facilitate chemical reactions, enabling more efficient and selective transformations while reducing the need for harsh reaction conditions and excessive energy input.

Multiple choice

Which of the following is a physical change?

  1. Rusting of iron

  2. Burning of wood

  3. Dissolving sugar in water

  4. Digestion of food
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Dissolving sugar in water is a physical change because the sugar molecules simply disperse throughout the water, without undergoing any chemical change.

Multiple choice

Which of the following is an example of a chemical change?

  1. Melting of ice

  2. Boiling of water

  3. Fermentation of grapes

  4. Condensation of water vapor
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Fermentation of grapes is a chemical change because it involves the conversion of sugar into alcohol and carbon dioxide by microorganisms.