Types of Chemical Reaction
Tamil Nadu Board · Class 10 · Science
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See them allWhat is a chemical reaction? Explain with an example.
Answer
A chemical reaction is a process in which atoms of reacting substances are rearranged to form new substances. Old chemical bonds are broken and new ones are formed. Example: When hydrogen gas combines…
What is the law of conservation of matter in chemical reactions?
Answer
The law of conservation of matter states that matter cannot be created or destroyed in a chemical reaction. Atoms are only rearranged to form new compounds. Therefore, in a balanced chemical equation,…
How do we write a balanced chemical equation? What information does it provide?
Answer
A balanced chemical equation represents a chemical reaction using chemical formulas and balancing coefficients so that atoms are conserved. Format: Reactants → Products with symbols for physical state…
Balance this chemical equation: Na + Cl₂ → NaCl
Answer
Balanced equation: 2Na(s) + Cl₂(g) → 2NaCl(s) Step-by-step balancing: 1. Count atoms on each side: Left has 1 Na and 2 Cl; Right has 1 Na and 1 Cl 2. Cl is unbalanced, so balance it: 2Na + Cl₂ → 2NaC…
Define combination reaction (synthesis reaction) and give its general equation.
Answer
A combination reaction is a chemical reaction in which two or more reactants combine to form a single product. It's also called synthesis or composition reaction. General equation: A + B → AB Types …
Why is the burning of LPG gas in your kitchen stove considered a combination reaction and an exothermic reaction?
Answer
The combustion of LPG (liquefied petroleum gas) is a combination reaction because: 1. Two reactants combine: C₃H₈(g) + 5O₂(g) → 3CO₂(g) + 4H₂O(g) + Heat 2. Propane and oxygen combine to form carbon di…
What is a decomposition reaction? List its three main types.
Answer
A decomposition reaction is a chemical reaction in which a single compound breaks down into two or more simpler substances. It's the opposite of combination reaction. General equation: AB → A + B Th…
What happens when you heat calcium carbonate (CaCO₃)? Describe the process and what you would observe.
Answer
Process: When calcium carbonate is heated strongly, it undergoes thermal decomposition. Chemical equation: CaCO₃(s) --Heat--> CaO(s) + CO₂(g) Observations: 1. White calcium carbonate powder graduall…
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