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Question Bank Solutions for ICSE Class 8 - CISCE - Chemistry

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Chemistry
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Define of Radical.

[0.05] Language of Chemistry
Chapter: [0.05] Language of Chemistry
Concept: Language of Chemistry

Tick the most appropriate answer.

Who discovered that radioactive rays are given out by uranium?

  1. Henri Becquerel
  2. Marie Curie
  3. Pierre Curie
  4. Schmidt
[0.04] Atomic Structure
Chapter: [0.04] Atomic Structure
Concept: Atoms: Building Blocks of Matter

Give one example each of which illustrates the following characteristics of a chemical reaction change in state

[0.061] Chemical Reaction
Chapter: [0.061] Chemical Reaction
Concept: Classification of Change: Chemical Changes

How do the following help in bringing about a chemical change?

pressure.

[0.061] Chemical Reaction
Chapter: [0.061] Chemical Reaction
Concept: Classification of Change: Chemical Changes

How do the following help in bringing about a chemical change?

light.

[0.061] Chemical Reaction
Chapter: [0.061] Chemical Reaction
Concept: Classification of Change: Chemical Changes

How do the following help in bringing about a chemical change?

catalyst .

[0.061] Chemical Reaction
Chapter: [0.061] Chemical Reaction
Concept: Classification of Change: Chemical Changes

How do the following help in bringing about a chemical change?

heat. 

[0.061] Chemical Reaction
Chapter: [0.061] Chemical Reaction
Concept: Classification of Change: Chemical Changes

Define; catalyst.

[0.061] Chemical Reaction
Chapter: [0.061] Chemical Reaction
Concept: Classification of Change: Chemical Changes

 What are (i) positive catalysts and (ii) negative catalysts? Support your answer with one example for each of them.

[0.061] Chemical Reaction
Chapter: [0.061] Chemical Reaction
Concept: Classification of Change: Chemical Changes

Name three biochemical catalysts found in the human body.

[0.061] Chemical Reaction
Chapter: [0.061] Chemical Reaction
Concept: Classification of Change: Chemical Changes

MATCH THE COLUMNAS

1. Jpham  Dalton a. Neutrons
2. Atom b. Model of the atom
3. Chadwick c.The atomic theory of matter 
4. Rutherfrod d. Positively  charged 
5. Protons e. Electricity neutral 
6. Nuclear  fusion  f. Generator of electricity 
7.Gamma -rays  g. High penetrating power 
  h.Energy in sun 
[0.04] Atomic Structure
Chapter: [0.04] Atomic Structure
Concept: Atoms: Building Blocks of Matter

TRUE \ FALSE

Elements combine in definite proportions to form compounds.

[0.04] Atomic Structure
Chapter: [0.04] Atomic Structure
Concept: Atoms: Building Blocks of Matter

TRUE \ FALSE

Elements having a tendency to accept electrons are called metals

 

[0.04] Atomic Structure
Chapter: [0.04] Atomic Structure
Concept: Atoms: Building Blocks of Matter

TRUE \ FALSE

Neils Bohr gave the theory to explain the arrangement of protons in an atom.

[0.04] Atomic Structure
Chapter: [0.04] Atomic Structure
Concept: Atoms: Building Blocks of Matter

TRUE \ FALSE

Cathode rays are a stream of fast moving particles that travel in random directions.

[0.04] Atomic Structure
Chapter: [0.04] Atomic Structure
Concept: Atoms: Building Blocks of Matter

WRITE SHORT ANSWER

Define an ionic compound.

[0.04] Atomic Structure
Chapter: [0.04] Atomic Structure
Concept: Atoms: Building Blocks of Matter

WRITE SHORT ANSWER

What is radioactivity?

[0.04] Atomic Structure
Chapter: [0.04] Atomic Structure
Concept: Atoms: Building Blocks of Matter

WRITE SHORT ANSWER

Name three inert gases.

[0.04] Atomic Structure
Chapter: [0.04] Atomic Structure
Concept: Atoms: Building Blocks of Matter

ANSWER IN DETAIL

State the postulates of the Dalton’s atomic theory.

[0.04] Atomic Structure
Chapter: [0.04] Atomic Structure
Concept: Atoms: Building Blocks of Matter

ANSWER IN DETAIL

Enlist the features of Bohr’s model of an atom. How did he correct the Rutherford’s model ?

[0.04] Atomic Structure
Chapter: [0.04] Atomic Structure
Concept: Atoms: Building Blocks of Matter
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