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WorksheetsENTHALPY
Total questions: 15
Worksheet time: 8mins
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
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
How do you calculate Enthalpy of a reaction?
ΔH = ΔHproducts - ΔHreactants
ΔT = q / mC
ΔG = ΔH -TΔS
E = mc2
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.
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
The potential energy diagram of a reaction is shown. Which statement below is correct relating to this reaction?
#1 represents the enthalpy change for this exothermic reaction.
#2 represents the enthalpy change for this endothermic reaction.
#3 represents the enthalpy change for this endothermic reaction.
#4 represents the enthalpy change for this exothermic reaction.
Change in enthalpy is also called as _______.
Systematic Reaction
Balanced Reaction
Energy of Reaction
Heat of Reaction
What do we mean by the term standard conditions
1atm, 20C and 1moldm3
1atm, 0K and 1moldm3
10atm, 273K and 10mol/dm3
100kPa, 298K and 1mol/dm3
Define the term Exothermic by picking the correct statements
Products have less energy than the reactants
ΔH is negative
ΔH is positive
Energy is given out to the surroundings (temperature goes up).
products have more energy than the reactants
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
Which symbol represents Enthalpy change?
ΔH
ΔT
ΔG
ΔS
Hfinal > Hinitial means _____
change of enthalpy is positive and system absorbs heat
change of enthalpy is negative and system absorbs heat
change of enthalpy is positive and system loses heat
change of enthalpy is negative and system loses heat
