Question

1 Pre-Lab Questions Al the boiling temperature of water, what interactions are being broken for the liquid water to water vapors? 2. For an endothermic process, the forward reaction absorbs or releases hear? 3. What is the difference between a Calorie and caloric value? 4. Define specific heat. 5. Calculate the heat lost by a 50.0 g piece of a copper metal that decreases its temperature from 45°C to 22 °C. The specific heat of copper is 0.092 cal/g °C.

Answer 1

1 In liquid water, water molecule are held together by hydrogen bonding when we heat water then we break hydrogen bonding in order to make water vapour. 2) Endothermic process are those in which we give heat energy more than it releases heat during the process. So, Overall heat is absorbed during the process. e-gu reactant & 60 KJ - product + 30KT this is endothermic process as overall we gave extera 30 kJ of heat. so In endothermic process absorbs heat in forward process. Calorie is unit of heat. Caloric value is the amount of heat contained in a substance which comes out during combustion of that substanance. its unit is KI/kg or Ilg or Kolg etc. 4 Sbecific heat: It is de fined as the amount of energy ired to raise the temperature of ig substance by 1°C : it unit is Ilgoc 5) mass of Cu = 509 AT = 45°c - 22°c = 23°C specific heat = 0.092 Callgoc heat lost = mSAT - 50 g x 0.092 Callgoc X 23°C C Scanned with CamScanner - 105.8 cal.