Podcast
Questions and Answers
Which of the following is a pure substance?
Which of the following is a pure substance?
What type of mixture is air?
What type of mixture is air?
Which of the following changes is reversible?
Which of the following changes is reversible?
What happens to the mass of a substance during a physical change?
What happens to the mass of a substance during a physical change?
Signup and view all the answers
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.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
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.
