ICSE Class 8 Chemistry Chapter 6 Solutions
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Questions and Answers

What is the definition of a chemical reaction?

  • Transformation into substances with distinct properties (correct)
  • Change in physical state
  • Change in color
  • Formation of a gas

During a chemical reaction, what occurs with the atoms of the reacting substances?

  • They remain unchanged
  • They bond with external atoms
  • They disappear
  • They break chemical bonds and rearrange to form new substances (correct)

What force holds the atoms of a molecule together in a compound?

  • Gravitational force
  • Electromagnetic force
  • Magnetism
  • Chemical bond (correct)

Which of the following is NOT an example of a characteristic of a chemical reaction?

<p>Change in temperature (A)</p> Signup and view all the answers

In a chemical reaction, what happens to the bonds between atoms of the reacting substances?

<p>They break (A)</p> Signup and view all the answers

What is the role of a catalyst in a chemical reaction?

<p>Increases or decreases the rate of reaction without undergoing any chemical change (A)</p> Signup and view all the answers

In the context of chemical reactions, what is a negative catalyst?

<p>A substance that decreases the rate of reaction (C)</p> Signup and view all the answers

When hydrogen sulfide gas reacts with chlorine gas, what is the resulting product?

<p>Sulphur (C)</p> Signup and view all the answers

How does light influence some chemical reactions?

<p>Can initiate reactions in certain cases (A)</p> Signup and view all the answers

Which substance is commonly used as a positive catalyst in the production of ammonia?

<p>Iron (D)</p> Signup and view all the answers

What is the product when lead nitrate is heated?

<p>Lead monoxide (B)</p> Signup and view all the answers

Flashcards

Chemical Reaction

Transformation into substances with distinct properties.

Atoms in Chemical Reaction

Atoms break chemical bonds and rearrange to form new substances.

Chemical Bond

Force that holds the atoms of a molecule together in a compound.

Characteristic of Chemical Reaction

A property of a reaction, like change in energy or gas release, but not temperature change.

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Bonds in Reacting Substances

Bonds between atoms of the reacting substances break during a reaction.

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Catalyst Role

Increases or decreases the rate of reaction without undergoing any chemical change.

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Negative Catalyst

A substance that decreases the rate of reaction.

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Hydrogen Sulfide and Chlorine Reaction

When reacted, results in the product of sulphur.

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Light's Influence in Reactions

Can initiate certain chemical reactions under specific conditions.

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Positive Catalyst in Ammonia Production

Iron is commonly used as a positive catalyst in the production of ammonia.

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Lead Nitrate Heating Product

Heating lead nitrate results in lead monoxide.

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Study Notes

Chemical Reactions

  • A chemical reaction involves the rearrangement of atoms and the formation of new substances with different properties.
  • In a chemical reaction, atoms of the reacting substances break existing bonds and form new bonds, resulting in the creation of new molecules and compounds.
  • The force holding atoms together in a molecule of a compound is the electrostatic force of attraction between the positively charged nucleus of one atom and the negatively charged electrons of another atom.
  • Physical changes are NOT characteristics of a chemical reaction. These include changes in state, size, or shape.
  • During a chemical reaction, bonds between atoms are broken and new bonds are formed, leading to the formation of new products.
  • A catalyst speeds up a chemical reaction without being consumed in the process.
  • A negative catalyst, also known as an inhibitor, slows down a chemical reaction.
  • The reaction of hydrogen sulfide gas with chlorine gas produces sulfur and hydrochloric acid as products.
  • Light can initiate, accelerate, or modify certain chemical reactions by providing the necessary energy for bond breaking or formation.
  • Iron is commonly used as a positive catalyst in the production of ammonia.
  • Heating lead nitrate results in the formation of lead oxide, nitrogen dioxide, and oxygen as products.

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Get expert solutions for Chapter 6 - Chemical Reactions from the Selina textbook for ICSE Class 8 Chemistry students. The solutions cover fundamental topics presented in a simple language to help students understand the concepts better and excel in their examinations.

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