Explain the following terms with examples.
a. Endothermic reaction
b. Combination reaction
c. Displacement reaction
Answers
Answer:
An endothermic reaction takes place when a great amount of energy is needed to break the existing bonds in the reactants. It means that an endothermic reaction needs or takes in energy to continue.
example:In a test tube, when a small quantity of ammonium chloride (NH4Cl) is dissolved in water, the tube becomes colder. Heat is absorbed from the surroundings during the chemical reaction
NH4Cl(s) + H2O(l) →→ NH4Cl(aq) – heat.
b)
A combination reaction is one in which two or more reactants combine to form a single product. Examples:formation of calcium oxide by the combination elements calcium and oxygen. 2Ca + O2 → 2CaO
c)
A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge are the same for both the reactants and the products.
example:6 CO2 + 6 H2O → C6H12O6 + 6 O2 (balanced equation for photosynthesis)
d)
Displacement reaction is a chemical reaction in which a more reactive element displaces a less reactive element from its compound. Both metals and non-metals take part in displacement reactions.
example:Fe + CuSO4 >>>>>>FeSO4 +Cu
Answer:
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