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Topic 9 – Kinetics and Equilibrium

8. Heat energy of reactions – Using Reference Table I:

Interpreting equations from Table I based on ∆H value
1. According to Reference Table I , which gas is formed from its elements as a result of an endothermic

reaction?
1) CO2 2) NO2 3) H2O 4) C2H6

2. Which of these gases, according to Reference Table I, is formed by a reaction that is exothermic?



3) C2H4(g)
1) NO2(g)
4) C2H6(g)

2) NO(g)

3. According to Reference Table I, which substance is formed by a reaction that absorbs heat energy?
4) H2O(g)



3) NH3(g)
1) HI(g)
2) H2O(l)


4. Based on Reference Table I, the formation of I mole of which substance releases the greatest
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amount of heat energy?
1) C2H2 2) NO 3) C2H6 4) NH3

5. The dissolving of which salt is accompanied by the release of heat?
1) Ammonium chloride 3) Potassium nitrate
2) Lithium bromide
4) Ammonium nitrate

6. According to Table I, which reaction is endothermic? 3) CO(g) + O2(g) ------- > CO2(g)
+
-
1) NaOH(s) ------ > Na (aq) + OH (aq)

+
-
2) NH4Cl(s) ------ > NH4 (aq) + Cl (aq) 4) N2(g) + H2(g) ------- > NH3(g)

7. In which reaction, according to Reference Table I, do the products have lower energy content than
the reactants?
1) 2C(s) + 3H2(g) ---- > C2H6(g) 3) N2(g) + O2(g) --------- > 2NO(g)
4) N2(g) + 2O2(g) ------- > 2NO2(g)
2) 2C(s) + H2(g) ------ > C2H2(g)
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8. According to Reference Table I, when two moles of H2O(g) are formed from its elements,


1) 484 KJ of heat is absorbed

3) 242 KJ of heat is absorbed
2) 484 KJ of heat is released 4) 242 KJ of heat is released

9. According to Reference Table I, when 1 mole of H2O(g) is formed from its element,
1) 484 KJ of heat is absorbed 3) 242 KJ of heat is absorbed
2) 484 KJ of heat is released 4) 242 KJ of heat is released

10. Based on Reference Table I, the combustion of 1 mole of CH4

3) Absorbs 485.2 KJ of heat


1) Releases 890.4 KJ of heat
2) Absorbs 890.4 KJ of heat 4) Releases 485.2 KJ of heat

11. According to Table I, the combustion of 2 moles of methane
1) Releases 890.4 KJ of heat 3) Releases 1780.8 KJ of heat
2) Absorbs 485.2 KJ of heat 4) Absorbs 1780.8 KJ of heat

12. According to Reference Table I, the formation of 2 moles of ethyne, C2H2,
1) Releases 227.4 KJ of heat 3) Releases 454.8 KJ of heat
4) Absorbs 454.8 KJ of heat
2) Absorbs 227.4 KJ of heat

13. According to Table I, what is the heat of reaction for the combustion of 1 mole of ethanol, CH3OH?



3) ∆ H = -726 KJ/mole
1) ∆H = -1452 KJ/mole
2) ∆H = + 1452 KJ /mole 4) ∆ H = + 726 KJ/mole

14. According to Reference Table I, what is ∆H for the formation of 0.5 mole of HI(g) from its elements?
1) +26.5 KJ/mole 3) +53.0 KJ/mole
2) +13.25 KJ/mole 4) +106.0 KJ/mole


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