Class 9 Science: Atoms and Molecules Worksheet
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Q1 · MCQ · 1 mark
Which of the following laws states that mass can neither be created nor destroyed in a chemical reaction?
Q2 · MCQ · 1 mark
The word 'atom' was coined by:
Q3 · MCQ · 1 mark
The chemical symbol for Sodium is:
Q4 · MCQ · 1 mark
What is the atomicity of Oxygen (O2) molecule?
Q5 · MCQ · 1 mark
Which of the following is a diatomic molecule?
Q6 · FILL · 1 mark
According to the Law of Constant Proportions, a pure chemical compound always contains the same elements combined together in the same proportion by ____.
Q7 · FILL · 1 mark
The smallest particle of an element that can take part in a chemical reaction is called an ____.
Q8 · FILL · 1 mark
A group of two or more atoms that are chemically bonded together is called a ____.
Q9 · SHORT · 2 marks
State the Law of Conservation of Mass.
Q10 · SHORT · 2 marks
Define atomicity. Give an example.