CHEM CHAPTER 1 PART 1 - PHYSICAL AND CHEMICAL CHANGE | UP BOARD 2026

Описание: CHEMISTRY
CHAPTER 1 CHEMICAL REACTION AND EQUATION
PART 1 PHYSICAL CHANGE AND CHEMICAL CHANGE


Here's a breakdown of the key topics discussed:

Chemistry Definition Chemistry is introduced as a vast subject dealing with various materials like metals, non-metals, solids, liquids, and gases.

Chemical Reaction : This is defined as the interaction between two substances (e.g., substance A reacting with substance B) to form something new.

Chemical Equation : Explained as a brief representation of a chemical reaction, simplifying the detailed description of reactions into a concise format.

Types of Changes : The video delves into two main types of changes substances undergo:

Physical Change :
This involves changes in physical properties like size, shape, state (solid, liquid, gas), appearance, or density .
The key characteristic is that the chemical composition remains unchanged, the changes are temporary , no new substance is formed, mass remains unchanged, and net energy is conserved.

Examples include water turning into ice, magnetization of iron, dissolution of sugar in water, and heating zinc oxide.

Chemical Change: These changes are permanent and irreversible, leading to the formation of a new substance with altered chemical composition and properties.

Examples include heating sugar to form carbon, burning paper, rusting of iron, and electrolysis of water.

Conditions for Chemical Change: For chemical changes to occur, substances need to be in close contact, and energy is often required. Energy can be supplied in various forms:

Heat: Demonstrated with the decomposition of calcium carbonate (CaCO3) into calcium oxide and carbon dioxide, an endothermic reaction.

Light : Illustrated with the reaction between hydrogen and chlorine to form HCl, and photosynthesis.

Electricity : Shown through the electrolysis of sodium chloride solution (20:45).

Pressure: Mentioned in the context of synthesizing ammonia from nitrogen and hydrogen.

Catalyst: Introduced as a substance that speeds up a chemical reaction without participating in it..

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