4 Questions
Which of the following is a pure substance?
Sugar
What type of mixture is air?
Solution
Which of the following changes is reversible?
Melting of ice
What happens to the mass of a substance during a physical change?
It stays the same
Study Notes
Pure Substances and Mixtures
- A pure substance is a material that has a fixed composition and properties.
- Examples of pure substances include elements (e.g., oxygen, iron) and compounds (e.g., water, salt).
Types of Mixtures
- Air is a homogeneous mixture, meaning it has a uniform composition throughout.
Physical and Chemical Changes
- A reversible change is a physical change that can be undone, such as melting and freezing of water.
- Physical changes do not alter the composition of a substance, and the mass of a substance remains constant during a physical change.
Test your knowledge of pure substances, types of mixtures, reversible changes, and the mass of substances during physical changes in this quiz based on Chapter 1 of the Class 9 Science curriculum.
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