Some Basic Concepts of Chemistry Definition, Types, Examples & Uses

Some Basic Concepts of Chemistry

Subject: General Science

Book: NCERT Chemistry Class 11

Chemistry is the study of matter and its properties.
- **Laws of Chemical Combination**:
- Law of Conservation of Mass.
- Law of Definite Proportions.
- **Mole Concept**:
- 1 mole = 6.022 × 10²³ particles.
- Used for stoichiometric calculations.
- **Atomic and Molecular Mass**:
- Atomic mass: Mass of an atom relative to Carbon-12.
- Molecular mass: Sum of atomic masses in a molecule.

**Possible Exam Questions:**
1. Explain the Law of Conservation of Mass with an example.
2. Define the mole concept and its significance.
3. How is molecular mass calculated?
4. What are the different types of chemical reactions?
5. Discuss Avogadro’s Hypothesis.