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WorksheetsEnthalpy L3 Y2
Total questions: 23
Worksheet time: 16mins
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 change of hydration
The enthalpy change of combustion
The enthalpy change of formation
The enthalpy change 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 all 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
Define endothermic by picking all the correct statements
ΔH is positive
Energy is taken in from the surroundings (temperature goes down).
Energy is given out to the surroundings (temperature goes up).
Products have less energy than the reactants
Products have more energy than the reactants
Define standard enthalpy change 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 conditions with all substances being in their standard states.
Heat change when one mole of substance is burnt partially in excess oxygen under standard state.
What does the circle mean in ΔH°?
Standard Conditions
Standard Temperature and Pressure
Degree K
Degree C
Match the definition to the correct term.
The enthalpy change that accompanies a reaction in the molar quantities shown in a chemical reaction under standard conditions with all reactants and products in their standard states.
The enthalpy change of formation
The enthalpy change of reaction
The enthalpy change of combustion
The enthalpy change of hydration
How do you calculate Enthalpy of a reaction?
ΔH = ΔHproducts - ΔHreactants
ΔT = q / mC
ΔH = ΔHreactants - ΔHproducts
q = mcΔT
Enthalpy changes of hydration values are always positive
True
False
Which statement is true regarding exothermic reactions?
Enthalpy changes of combustion values are always negative
True
False
Match the definition below to the correct term.
The enthalpy change that takes place when one mole of gaseous ions is dissolved in an infinitely dilute solution under standard conditions.
The enthalpy change of hydration
The enthalpy change of combustion
The enthalpy change of formation
The enthalpy change of reaction
A reaction that gives out energy to the surroundings causes the surroundings ....
temperature to drop
temperature to rise
temperature to remain constant
temperature to vary
Enthalpy changes of formation values are always positive
True
False
