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🔥 CHEMICAL REACTIONS AND EQUATIONS ( CLASS 10TH CHEMISTRY )

🌟 What is a Chemical Reaction?

A chemical reaction is a process in which one or more substances change into new substances with different properties.

➡️ During a chemical reaction:

Old bonds break

New bonds form

New substances are produced

📌 Example:
Iron + Oxygen + Water → Rust
Iron changes into rust, which has different properties.

🌟 What is a Chemical Equation?

A chemical equation is a symbolic representation of a chemical reaction using:

Chemical symbols

Chemical formulae

📌 Example (Word equation):
Magnesium + Oxygen → Magnesium Oxide

📌 Symbolic equation:
2Mg + O₂ → 2MgO

🌟 Reactants and Products

Reactants: Substances that take part in a reaction

Products: New substances formed after reaction

👉 Reactants are written on the left-hand side (LHS)
👉 Products are written on the right-hand side (RHS)

🌟 Balanced Chemical Equation

A chemical equation is balanced when:

Number of atoms of each element on LHS = RHS

📌 This follows the Law of Conservation of Mass, which states:

Mass is neither created nor destroyed in a chemical reaction.

✔️ Balanced equation shows correct quantities of reactants and products.

🌟 Characteristics (Signs) of Chemical Reactions

A chemical reaction is identified by one or more of the following:

1️⃣ Change in colour
2️⃣ Evolution of gas
3️⃣ Change in temperature (heat absorbed or released)
4️⃣ Formation of precipitate
5️⃣ Change in state

📌 These signs prove that a new substance has been formed.

🌟 Importance of Chemical Reactions

Chemical reactions are essential because:

Digestion of food is a chemical reaction

Respiration is a chemical reaction

Rusting, burning, cooking – all involve chemical reactions

Life processes depend on chemical reactions

✨ One-Line Exam Summary

Chemical reactions explain how substances change, and chemical equations represent these changes symbolically.

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