Advertisements
Advertisements
Question
Explain, giving one example of the following chemical change:
Thermal dissociation
Advertisements
Solution
A reversible decomposition reaction brought about only by heat is called thermal dissociation reaction.
Heat some solid ammonium chloride in a test tube. Two colourless gases, ammonia and hydrogen chloride, are produced. As these gases move up to the upper part of the cooler test tube, they combine to form ammonium chloride, which appears as a white sublimate on the upper cooler side of the test tube.
\[\ce{NH4Cl <=> NH3 \uparrow + HCl \uparrow}\]
APPEARS IN
RELATED QUESTIONS
Decomposition brought about by heat is known as thermal decomposition. What is the difference between thermal dissociation and thermal decomposition?
State the type of reactions for the following represent and balance the ones that are not balanced.
CaCO3→ CaO+ CO2
Complete the table given below.
| Heat on Copper Nitrate | Colour of acidic gas evolved |
Convert hydrogen to hydrogen chloride by a direct combination reaction.
Give a balanced equation for thermal decomposition of ammonium dichromate
State the double decomposition – neutralization reaction with a suitable representation.
Give a balanced equation for the following type of reaction:
A direct combination reaction between phosphorus and neutral gas.
Give a balanced equation for the following type of reaction:
A synthesis reaction between a metal and a non-metal resulting in the formation of an insoluble salt of iron.
Differentiate between the following:
Thermal decomposition & thermal dissociation.
Match the chemical reactions in List I with the appropriate answer in List II.
| List I | List II |
| 1. \[\ce{AB⇌[heat]A + B}\] | A: Double decomposition |
| 2. \[\ce{AB->A + B}\] | B: Thermal dissociation |
|
3. \[\ce{X+Y- + AB+B- ->X+B- + A+Y-}\] |
C: Endothermic reaction |
| 4. \[\ce{X + YZ->XZ + Y}\] | D: Displacement reaction |
| 5. \[\ce{X + Y->[heat]XY - \Delta}\] | E: Decomposition reaction |
