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Questions and Answers
What is the chemical formula for marble?
What is the chemical formula for marble?
- H2O
- Ca(OH)2
- CaCO3 (correct)
- CO2
Which of the following reactions is an example of an exothermic reaction?
Which of the following reactions is an example of an exothermic reaction?
- Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O(l)
- 2H2(g) + O2(g) → 2H2O(l)
- C(s) + O2(g) → CO2(g)
- CH4(g) + 2O2(g) → CO2(g) + 2H2O(g) (correct)
In the context of chemical reactions, what defines an exothermic reaction?
In the context of chemical reactions, what defines an exothermic reaction?
- Formation of cold products
- Release of heat during reaction (correct)
- No change in temperature
- Absorption of heat during reaction
What type of chemical reaction occurs when calcium hydroxide reacts with carbon dioxide?
What type of chemical reaction occurs when calcium hydroxide reacts with carbon dioxide?
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Which substance is formed when coal burns in the presence of oxygen?
Which substance is formed when coal burns in the presence of oxygen?
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What type of reaction is the burning of natural gas?
What type of reaction is the burning of natural gas?
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During which process do we obtain energy from the food we eat?
During which process do we obtain energy from the food we eat?
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Study Notes
Chemical Reactions and Equations
- A complete chemical equation represents the reactants, products, and their physical states symbolically.
- A chemical equation must be balanced to ensure the same number of atoms of each type on both the reactant and product sides.
Types of Chemical Reactions
- Combination Reaction: Two or more substances combine to form a new single substance.
- Decomposition Reaction: A single substance decomposes to give two or more substances.
- Displacement Reaction: An element displaces another element from its compound.
- Double Displacement Reaction: Two different atoms or groups of atoms (ions) are exchanged.
- Precipitation Reaction: Produces insoluble salts.
Oxidation and Reduction
- Oxidation: Gain of oxygen or loss of hydrogen by substances.
- Reduction: Loss of oxygen or gain of hydrogen by substances.
Exothermic and Endothermic Reactions
- Exothermic Reaction: Reactions where heat is given out along with the products.
- Endothermic Reaction: Reactions where energy is absorbed.
Examples of Chemical Reactions
- Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water
- Zinc + Silver nitrate → Zinc nitrate + Silver
- Aluminium + Copper chloride → Aluminium chloride + Copper
- Barium chloride + Potassium sulphate → Barium sulphate + Potassium chloride
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