1. A car's engine block is made of (a) Iron, (b) Copper, (c) Tungsten and has a mass of 210 kg.
How much heat is absorbed by the engine when its temperature is raised from
(a) 10° C to 91°C? (b) 13° C to 97° C? (c) 14° C to 98° C?

i) Heat required to raise temperature of iron is

ii) Heat require to raise temperature of copper is

iii) Heat require to raise temperature of tungsten is

Explanation:

As we know that specific heat capacity of

i) Iron is 444 J/kg C

so heat required to raise its temperature is given as

ii) Copper specific heat is 385 J/kg C

so heat required to raise its temperature is given as

iii) Tungsten specific heat capacity is given as 134 J/kg C

freezing

deposition

condensation

explanation;

melting also called fusion is the process where solid becomes liquid, sublimation is the process where solid becomes gaseous without first changing to liquid, deposition involves change from gaseous to solid state, freezing involves change from liquid to solid, boiling or evaporation involves change of liquid to gaseous state, while condensation is the change from gaseous state to liquid state.

endothermic reactions involves absorption of heat from the surroundings or the environment while exothermic reactions involves loss of heat energy to the surroundings.

in this case, sublimation, evaporation and melting are endothermic reactions (gain energy from the environment) while, freezing, deposition and condensation are exothermic (loss of energy to the surroundings) reactions.

ammonium chloride & tallow