Question

1) what are the strongest substances top 10
2) what is the smallest thing in the world ever discovered
3)what is theta tan theta
4)what are the what is mean by displacement reaction give example
5)what is the double displacement reaction give example
6)define exthermic and endothermic reaction
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Answer 1

Answer:

4)Double displacement reactions generally take place in aqueous solutions in which the ions precipitate and there is an exchange of ions. For example, on mixing a solution of barium chloride with sodium sulphate, a white precipitate of barium sulphate is immediately formed. These reactions are ionic in nature.

5)An exothermic reaction is a chemical reaction that releases energy through light or heat. It is the opposite of an endothermic reaction. Expressed in a chemical equation: reactants → products + energy. Exothermic Reaction means "exo" meaning releases and "thermic" means heat

Answer 2

Answer:

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