Energy Changes ∆h Accompanying Physical And Chemical Changes Jamb Chemistry Past Questions
Question 1
The energy value of petrol can be determined by
- A. Bomb calorimeter
- B. Catalytic cracker
- C. Fractionating column
- D. Thermometer
Question 2
When steam is passed over red hot carbon the substances produced are
- A. hydrogen and trioxocarbonate (IV) acid
- B. hydrogen, oxygen and carbon (IV) oxide
- C. hydrogen and carbon (ii) oxide
- D. hydrogen and carbon (IV) oxide
Question 3
COg + H2Og \(\to\) 2g + H2g \(\Delta\)H = -4100J. Which of the following factors favour the formation of hydrogen in the above reaction? i. high pressure. ii. low pressure iii. high temperature iv. use of excess steam
- A. i, iii and iv
- B. iii only
- C. ii, iii and i
- D. iv only
Question 4
The heat required to raise the temperature of the body by 1k is called?
- A. Specific heat
- B. Thermal capacity
- C. Water equivalent
- D. None of the above
Question 5
The energy change (ΔH) for the reaction CO(g) + (1)/(2)O2(g) → is?
(ΔHi(CO) = -110.4 kJ mol-) (ΔHi(CO2) = -393 kJ mol-)
- A. -503.7 kJ
- B. +503.7kJ
- C. -282.9 kJ
- D. +282.9 kJ
- E. +393.3 kJ
