Chemical Changes and Reactions
ICSE · Class 9 · Chemistry
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See them allWhat is a chemical reaction?
Answer
A chemical reaction is the process of breaking the chemical bonds of the reacting substances (reactants) and making new bonds to form new substances (products). During this process, the chemical compo…
What is a chemical bond?
Answer
A chemical bond is the force that holds the atoms of a molecule together, as in a compound. It is responsible for keeping atoms connected to form molecules and compounds.
List the seven conditions necessary for chemical reactions to occur.
Answer
1. Mixing (close contact) - substances in solid state 2. Solution - substances in molten or aqueous state 3. Heat - energy supplied through heating 4. Light - photochemical reactions 5. Electricity - …
What is effervescence?
Answer
Effervescence is the formation of gas bubbles in a liquid during a chemical reaction. It occurs when one of the reactants is a liquid and a gas is produced as a product, creating visible bubbles in th…
What are the four main characteristics observed in chemical reactions?
Answer
1. Evolution of gas - gas bubbles or effervescence 2. Change of colour - reactants change color during reaction 3. Formation of precipitates - insoluble solid substances formed 4. Change of state - ch…
What is a combination reaction? Give the general formula and one example.
Answer
A combination reaction is when two or more substances combine together to form a single substance. General formula: A + B → AB Example: 2Mg + O₂ → 2MgO (Magnesium burns in oxygen to form magnesium oxi…
What is a decomposition reaction? Give the general formula and one example.
Answer
A decomposition reaction is the breaking up of a compound into elements or simpler compounds. General formula: AB → A + B Example: 2HgO → 2Hg + O₂ (Mercuric oxide decomposes into mercury and oxygen wh…
What is a displacement reaction? Give the general formula and one example.
Answer
A displacement reaction is when a more active element displaces a less active element from its salt solution. General formula: A + BC → AC + B Example: Zn + CuSO₄ → ZnSO₄ + Cu (Zinc displaces copper f…
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