MEDIUM
7th CBSE
IMPORTANT
Earn 100

Write the chemical equation for the chemical reaction shown in the illustration.

In the illustration:

  • The black sphere represents a carbon atom.​​
  • The white sphere represents a hydrogen atom.
  • The grey sphere represents an oxygen atom.

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Important Questions on Structure of Matter

EASY
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>ORAL QUESTIONS>Q 1

What is the difference between the smallest particle of an element and the smallest particle of a compound?

EASY
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>ORAL QUESTIONS>Q 2
For all elements, the smallest particle that can exist independently is an atom. Do you agree? Give reasons.
EASY
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>ORAL QUESTIONS>Q 3
Most elements are found in a free state in nature. Do you agree? Give reasons?
MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>ORAL QUESTIONS>Q 4
A scientist found that two samples of the same compound had the same elements combined in different ratios. Was the finding correct?
EASY
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>ORAL QUESTIONS>Q 5
The same scientist as above found that two samples of a mixture of the same elements had the elements mixed in different ratios. Was the finding correct this time?
EASY
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>ORAL QUESTIONS>Q 1
What is the difference between the symbol and the formula of oxygen?
MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>ORAL QUESTIONS>Q 2
What specific name is given to 'the number of hydrogen atoms that can combine with or be displaced by one atom of an element'? Is this a modern definition?
MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>ORAL QUESTIONS>Q 3
An element X forms a compound XH3 with hydrogen. Another element Y forms a compound YX2 with X. Given that the valency of hydrogen is 1, what are the valencies of X and Y?