Question

Chemistry Some Questions:-

Answer 1

1.) {a} Combination reaction => In this reaction two or more elements combine to form a single product or compound .

{b} Displacement reaction => In this reaction more reactive elements displaces less reactive element from its compound.

{C} Decomposition reaction => In this reaction one single compound breakdown into two or more simpler substances. It is opposite of Combination reaction.

2.) {a} 2H2 + O2 -----> 2H2O

{b} 3H2 + N2 -------> 2NH3

3.) There are five signs of chemical reaction happened :-

(1) Change in colour

(2) Change in state

(3) Formation of Precipitate

(4) Change in Temperature

(5) Release of gas or Formation of gas

4.) {a} H2(g) + CL2(g) ------> 2 HCL(g)

{b} CaCo3(s) -------> CaO(s) + Co2(g)

5.) {a} The substance produced in a chemical reaction are called Product. Product is always written in the right side of the arrow.

{b} When a numbers of atoms present in reactant side is equal to the numbers of atoms in product side is called Balanced Chemical reaction.

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