Energy Change in Chemical Reaction
Trending Questions
Give an example of a reaction where the following are involved:
(a) Evolution of heat
(b) Absorption of heat
(c) High pressure is required
Constant boiling mixtures are known as :
Distillators
Constant compounds
Azeotropes
Woulfes compounds
Which of the following is an exothermic process?
Melting of ice
Evaporation of water
Boiling of soup
Condensation of water vapour
Water and alcohol are _____________ liquids.
(a) What is a chemical reaction.
(b) State the condition necessary for a chemical change or a reaction to take place.
Solubility of a gas in a liquid______ with rise of temperature.
___________ is the method of separation of components of a mixture containing two miscible liquids that boil without decomposition and have sufficient difference in their boiling points.
Distillation
Crystallisation
Filtration
Decomposition
The two metals involved in the galvanization process are
iron and copper
iron and zinc
zinc and copper
copper an aluminium
Give an example of a reaction where the following are involved
(a) Heat
(b) Light
(c) Electricity
(d) Close contact
(e) Solution
(f) Pressure
(g) Catalyst
Give reasons for the following observations with regard to Halls Heroults process.
Cryolite and fluorspar are added to pure alumina.
Match the item of column I to column II.
| Column 1 | Column 2 |
|---|---|
Cooling the molten iron |
Melting |
Camphor (s)Camphor (g) |
Vaporisation |
Dry air Liquid air |
Liquefaction |
Sodium(s) Sodium(l) |
Freezing |
Ethanol to ethanol vapour |
Sublimation |
Mixing of which of the following pair of components involve significant energy change?
Sulphur, Water
Sulphur, Iron filings
Calcium carbonate, Sulphur
Potassium, Ice cold water
Define effervescence.
- True
- False
