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- 1. Multiple ChoiceΔH value in an endothermic reaction is a positive number.TrueFalse
- 2. Multiple Choice
Match the definition below to the correct term.
The enthalpy change that takes place when one mole of a compound is formed from its elements in their standard states under standard conditions.
The enthalpy of neutralisation
The enthalpy of combustion
The enthalpy of formation
The enthalpy of reaction
- 3. Multiple ChoiceDefine 'Enthalpy'a) Energy stored in the movement of molecules in a substanceb) The opposite of temperaturec) The temperature of a moleculed) Energy stored in the chemical bonds in a substance
- 4. Multiple Choice
What does the circle mean in ΔH°?
Standard Conditions (T=298.15 K P=1 atm)
Standard Temperature and Pressure (T=273.15 K P=1 atm)
Degree K
Degree C
- 5. Multiple Choice
How do you calculate Enthalpy of a reaction?
ΔH = ΔHproducts - ΔHreactants
ΔT = q / mC
ΔG = ΔH -TΔS
E = mc2
- 6. Multiple Choice
"Heat change when 1 mole of gaseous atom is formed from its element at standard states" is the definition for _______.
standard enthalpy of formation
standard enthalpy ofhydration
electron affinity
standard enthalpy of atomisation
- 7. Multiple Choice
Name the type of enthalpy for the following reaction:
Na+ (g) --> Na+ (aq) ΔH = -364 kJmol-1
Standard enthalpy of neutralisation, ΔHneuto
Standard enthalpy of solution, ΔHsolno
Standard enthalpy of hydration, ΔHhydo
lattice energy, ΔHlatticeo
- 8. Multiple Choice
Define standard enthalpy of combustion.
Heat released when one mole of substance is burnt completely in excess oxygen.
Heat absorbed when one mole of substance is burnt completely in excess oxygen under standard state.
Heat released when one mole of substance is burnt completely in excess oxygen under standard state.
Heat change when one mole of substance is burnt partially in excess oxygen under standard state.
- 9. Multiple Choice
Which of the following has a ΔHfo value of 0?
Br2(g)
N(g)
CO(g)
N2(g)
- 10. Multiple Choice
Which of the equation below refers to the standard enthalpy of formation, ΔHfo?
Na(g) ---> Na+(g) + e- ΔH = -364 kJmol-1
C2H5OH(l) + 3O2(g) ---> 2CO2(g) + 3H2O (l) ΔH = - 1286 kJmol-1
2C(s) + 2H2(g) ---> C2H4 (g) ΔH = - 52.3 kJmol-1
Na+(g) ---> Na+(aq) ΔH = - 364 kJmol-1
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