MEDIUM
7th CBSE
IMPORTANT
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A substance when viewed under an electron microscope revealed that it contains only one kind of atoms. Is the substance an element, compound or mixture?

Important Questions on Matter and Chemical Formulae

EASY
7th CBSE
IMPORTANT
Expanded Universal Science 7>Chapter 5 - Matter and Chemical Formulae>TRACK YOUR PROGRESS>Q 1
_____are the basic building blocks of matter.
EASY
7th CBSE
IMPORTANT
Expanded Universal Science 7>Chapter 5 - Matter and Chemical Formulae>TRACK YOUR PROGRESS>Q 1
The atoms in _____ are tightly packed together.
EASY
7th CBSE
IMPORTANT
Expanded Universal Science 7>Chapter 5 - Matter and Chemical Formulae>TRACK YOUR PROGRESS>Q 1
The number of protons is equal to the number of _____ in an atom.
MEDIUM
7th CBSE
IMPORTANT
Expanded Universal Science 7>Chapter 5 - Matter and Chemical Formulae>TRACK YOUR PROGRESS>Q 1
An _____is formed when an atom loses or gains electrons.
EASY
7th CBSE
IMPORTANT
Expanded Universal Science 7>Chapter 5 - Matter and Chemical Formulae>TRACK YOUR PROGRESS>Q 2
Atoms of two different elements are_____.
EASY
7th CBSE
IMPORTANT
Expanded Universal Science 7>Chapter 5 - Matter and Chemical Formulae>TRACK YOUR PROGRESS>Q 2
Oxygen molecule has _____atoms.
EASY
7th CBSE
IMPORTANT
Expanded Universal Science 7>Chapter 5 - Matter and Chemical Formulae>TRACK YOUR PROGRESS>Q 2
The constituent elements of a _____ lose their own properties.
EASY
7th CBSE
IMPORTANT
Expanded Universal Science 7>Chapter 5 - Matter and Chemical Formulae>TRACK YOUR PROGRESS>Q 2
The constituents of a compound combine in_____ratio. (fixed / indefinite)