Question

Give 10 reactions of exothermic and 10reactions for endothermic reactions.

They all should be the proper equations with physical state, catalist ( if there ), ppt, colour, ect. Write that what the equation is for ( for example, burning of coal, ect. I mean u have to write what the equation is for)

Answer 1

HI !

Exothermic Reaction ( Heat is released into the surroundings)

s - solid
g - gas
aq - aqueous
l - liquid
Δ - heat


1) Burning of coal :-
C (s) + O₂ (g)   ------> CO₂ (g)

2)Thermite reaction 
                                 Δ
Al (s) + Fe₂O₃ (s) ----------> Al₂O₃ (s) + Fe ( l)

3) Reaction of quick lime with water

CaO(s) + H₂O(l) -----> Ca(OH)₂ (aq)

4) Reaction of calcium chloride and water.

CaCl₂(s) + H₂O(l) -------> Ca(OH)₂ (aq) + HCl(aq)

5) Reaction of Sodium with Water . ( Alkali - NaOH ( to manufacture soap)is formed )

Na(s) + H₂O(l) -------> NaOH(s) + H₂(g) + Heat

6) Reaction of potassium with water. ( KOH - salt is formed)
K(s) +  H₂O(l) -------> KOH(s) + H₂(g) + Heat

7) Respiration
C₆H₁₂O₆(s) + O₂(g) -------> CO₂(g) + H₂O(l) + Energy

8) Rusting of iron
Fe(s) + O₂(g) ---> Fe₂O₃ (s)(rust)

9) Neutralisation reaction
NaOH(aq) + HCl(aq) ------> NaCl(aq) + H₂O(l)

10) Displacement reaction 

H₂SO₄(aq) + Mg(s) ----> MgSO₄(aq) + H₂(g)

---------------------------------------------------------------------------------------------

Endothermic reaction (Heat is absorbed from the surroundings)

1. Photosynthesis
                        sunlight
CO₂(g) + H₂O (l) - -------------->C₆H₁₂O₆(s) + O₂(g)

2) Decomposition reaction of Calcium carbonate
              heat
CaCO₃(s) -----------> CaO + CO₂

3) Decomposition of potassium chlorate
              Heat
KClO₃(s)  ----------> KCl(s) + O₂(g)

4)Electrolysis of water
         electric current
H₂O(l) -----------------------> H₂ (g)+ O₂(g)

5) Photolysis of Silver chloride
           sunlight
AgCl(s) ---------------> Ag (s)+ Cl₂(g)

6) Photolysis of Silver bromide

          sunlight
AgBr(s) ---------------> Ag(s) + Br₂(g)

7) Decomposition of hydrogen peroxide
           Heat
H₂O₂(l) -----------> H₂O (l)+ O₂(g)

8)Decomposition of ferric hydroxide
                   heat
Fe(OH)₃(s) -------------> Fe₂O₃(s) + H₂O (l)

9) Nitrogen reaction with oxygen ( to form nitric oxide)

N₂(g) (g)+ O₂ (g) + Heat → 2NO 

10) Decomposition of FeSO₄ (ferrous sulphate)
                 heat
FeSO₄(s) ----------> Fe₂O₃(s) + SO₂(g) + SO₃(g)

Answer 2

...REACTION...

ENDOTHERMIC REACTION

The endothermic process is a term that describes a reaction where the system absorbs the energy from its surrounding in the form of heat. 

EXAMPLE ::

melting ice cubes

melting solid salts

evaporating liquid water

splitting a gas molecule

separating ion pairs

cooking of rice

baking bread


EXOTHERMIC REACTION

The exothermic reaction is the opposite of an endothermic reaction. It releases energy by light or heat to its surrounding.


Zn + 2HCl -----  ZnCl2 + H2

C + O2 ----- CO2

                         
Al + Fe₂O₃ ---------- Al₂O₃ (s) + Fe


CaO+ H₂O ---- Ca(OH)₂


respiration

rain forming from water vapor in clouds

burning sugar

burning candle

nuclear fission