types of chemical reactions

Question 1

what are the types of chemical reactions?

Answer 1

the types of chemical reactions are as follows: -
. combination reaction
. decomposition reaction
. displacement reaction
. double displacement reaction
. exothermic reactions
. endothermic reactions

Question 2

what are combination reactions?

Answer 2

when two or more substances combine together to form a single product, such a reaction is called combination reaction.

Question 3

what are decomposition reactions?

Answer 3

when a single reactant breaks down to produce simpler substances, such a reaction is called decomposition reaction.

Question 4

what is a thermal reaction?

Answer 4

a reaction in which heat is carried out.

Question 5

what color of fumes does nitrogen dioxide create?

Answer 5

brown fumes

Question 6

write the formula for decomposition reaction of lead nitrate.

Answer 6

Pb (NO3)2 → 2PbO+ 4NO2+O2

Question 7

write the decomposition formula for ferrous sulphate.

Answer 7

2FeSO4→Fe2O3+SO2+SO3

Question 8

what is the change after burning in ferrous sulphate?

Answer 8

the colors of its crystal’s changes from green to white.

Question 9

what is photolysis?

Answer 9

photolysis is a type of reaction in which the compound or element breaks own into smaller molecules by electromagnetic radiation typically in the form of visible or ultraviolet light. the energy from light breaks down the chemical bonds of the substance leading to a new chemical species.

Question 10

what happens to white silver chloride in sunlight and why?

Answer 10

when exposed to sunlight the white silver chloride turns grey due to the process of photolysis. this happens because of the decomposition of silver chloride into silver and chlorine by breakdown by sunlight.

Question 11

write the formula of reaction of silver chloride in sunlight.

Answer 11

2AgCl→ 2Ag+Cl2

Question 12

what is electrolysis?

Answer 12

it is the process of passing an electric current through a substance to drive a non-spontaneous chemical reaction. mainly it is passed through electrolytes to form a decomposition reaction.

Question 13

what is displacement reaction?

Answer 13

in a displacement reaction one element can replace the other in a compound, this is only possible when the element replacing is more reactive than the one being replaced.

Question 14

what happens to copper sulphate solution after being displaced?

Answer 14

the color of copper sulphate changes from blue to a faded shade.

Question 15

write the formula of displacement of iron in copper sulphate.

Answer 15

Fe + CuSO4 → FeSO4 + Cu

Question 16

give some examples of displacement reaction.

Answer 16

> Zn + CuSO4 → ZnSO4 + Cu
Pb + CuCl2 → PbCl2 + Cu

Question 17

what are double displacement reactions?

Answer 17

double displacement reactions or double replacement reactions or metathesis reactions are the ones in which two elements replace each other to form two new compounds. A positive substance replaces a negative one to form new compounds.in such a reaction exchange of ions takes place.

Question 18

what is precipitate?

Answer 18

it is an insoluble substance formed by a reaction

Question 19

write few examples of double displacement reaction.

Answer 19

> Na2SO4 + BaCl2 → 2NaCl + BaSO4
HCl + NaOH → NaCl + H2O

Question 20

what happens when you put sodium sulphate in barium chloride solution?

Answer 20

when we put sodium sulphate in barium chloride solution it forms a double displacement reaction and makes a precipitate, a white colored insoluble substance.

Question 21

what is oxidation?

Answer 21

when a substance loses an electron from its element, atom or ion, the process is called oxidation. it happens when oxygen in substance increases, or the hydrogen decreases or loses molecules.

Question 22

what is oxidizing agent?

Answer 22

it is an agent which helps in the loss of electrons or gain of oxygen to a substance and causing oxidation reaction.

Question 23

what is reduction?

Answer 23

the process of gaining electrons by a substance, atom or ions is called reduction. in such reaction hydrogen molecules are increased and oxygen molecules are decreased.

Question 24

what is reducing agent?

Answer 24

an agent which helps a substance to gain atoms or gain more molecules of hydrogen. it is an agent which Facilites the process of reduction reaction.

Question 25

what is corrosion?

Answer 25

it is the process of reaction of a metal from its surrounding environment, it forms a metal oxide or metal salt layer on the surface of a metal.