Questions and Answers
What is the difference between physical change and chemical change?
Physical changes can be easily reversed, while chemical changes are more permanent and involve the formation of new substances.
What happens to atoms during a chemical reaction?
During a chemical reaction, atoms do not change into those of another element; instead, there is a rearrangement of atoms.
What is formed when magnesium burns in air?
Chemical changes can be easily reversed.
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The powder formed when magnesium burns is called _______.
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Study Notes
Preface
- Reference Study Material created for Class X Chemistry tailored to the 2017-18 CBSE syllabus.
- Aims to simplify complex topics to aid understanding, especially for weaker students.
- Includes NCERT book questions and their answers, fostering confidence with foundational problems before advancing to Higher Order Thinking Skills (HOTS) questions.
- Expresses gratitude to various educational leaders for their support and encouragement in preparing this material.
- Open to feedback and corrections to improve future editions.
Dedication
- Material dedicated to Late Shri M.S. Mallayya, the author's father.
Chapter 1: Chemical Reactions and Equations
- Changes can be classified into physical (easily reversible) and chemical (permanent).
- Chemical changes result in the formation of new substances, differing from the original.
- A key aspect of chemical reactions is the rearrangement of atoms, without any atom changing into a different element.
- Example: Burning magnesium ribbon creates magnesium oxide with a dazzling white flame:
- Reactants: Magnesium (ribbon) + Oxygen (from air).
- Product: Magnesium Oxide (white powder).
- Chemical reactions involve energy changes; in this example, heat is released during reaction.
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Description
This study material is specifically designed for Class X chemistry students, covering chapter-wise concepts, key formulas, and important questions, including higher-order thinking skills (HOTS) questions. It aims to aid in thorough preparation and understanding of chemistry topics relevant for the year 2017-18.
