Energetics of Chemical Reactions - Chapter No 5

Right Answers have been shown below in red color.

1. The energy that transfer from one object to another due to their difference in temperature, is called _________.

a) Heat
b) Temperature
c) covalent
d) Energy

2. The S.I. Unit of heat is_________.

a) Coulomb
b) Joule
c) Newton
d) Kilometer

3. 1 KJ = _________J.

a) 106
b) 104
c) 103
d) 105

4. The equation shows __________ reaction.
C + O2 ————> CO2, ΔH = -393.7 KJ / mole.

a) Endothermic
b) Exothermic
c) Null
d) Salt

5. The reactions, in which heat is absorbed from the surrounding to the system, are called _________ reactions.

a) Null
b) Salt
c) Endothermic
d) Exothermic

6. The equation shows ______ reaction.
C + O2 ————> CO + H2, ΔH = 131.4 KJ / mole.

a) endothermic
b) Exothermic
c) Chemical
d) Content

7. Heat of reaction is denoted by__________.

a) ΔK
b) ΔH
c) ΔR
d) ΔC

8. 1 Calorie = ____________ Joules.

a) 4.184
b) 3.148
c) 8.144
d) 9.144

9. “ΔH” is _________ in exothermic reactions.

a) Positive
b) Negative
c) Zero
d) One

10. “ΔH” is _________ in endothermic reactions.

a) Positive
b) Negative
c) Zero
d) One

11. Everything which is under experiment is called ________.

a) System
b) Negative
c) Positive
d) Constant

12. The things which are not a part of a system are called __________.

a) System
b) Surroundings
c) Bond energy
d) Rate of reaction

13. The state function is___________.

a) Volume
b) Velocity
c) Graphite
d) None of these

14. The internal energy of a molecule is the sum of __________ energy and potential energy.

a) Pressure
b) Temperature
c) Kinetic
d) None of these

15. The branch of science that deals with energy transformation are called __________.

a) Thermodynamics
b) Rate of reaction
c) Constant
d) Energy

16. Energy can convert from one form to another, it can neither be created nor destroyed.

a) Second law of thermodynamics
b) First law of thermodynamics
c) Law of potential energy
d) None of these

17. According to “Hess’s” law __________.

a) ΔH remains same
b) ΔH / ΔQ = Constant
c) “ΔH” shows negative value
d) None of these

18. Hess’s law explains the__________ in heat of reaction.

a) Changes
b) Equal
c) Temperature
d) Joules

19. Thermochemistry is the study of the relationship between heat, energy and.

a) Kinetic energy
b) Chemical energy
c) Energy of activation
d) Ionization energy

20. According to Hess law.

a) Kp= Kc (RT)n
b) ΔH=positive
c) ΔH is same whiter process takes place in one step or more than one step
d) None of the above

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