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- 1. 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
- 2. Multiple Choice
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
- 3. Multiple Choice
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
- 4. Multiple Choice
Define Endothermic by picking 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
- 5. Multiple ChoiceΔH value in an endothermic reaction is a positive number.TrueFalse
- 6. Multiple ChoiceFor which of these processes is the value of ΔH expected to be positive?
1. The temperature increases when calcium chloride dissolves in water.
2. Steam condenses to liquid water
3. Water boils
4. Dry ice sublimates4 only1 only3 and 4 only2 and 3 only - 7. Multiple Choice
What type of reaction is shown in the reaction pathway?endothermic reactionexothermic reaction - 8. Multiple ChoiceWhat type of reaction is shown in the reaction pathway?endothermic reactionexothermic reaction
- 9. Multiple ChoiceThe SI unit of heat and energy is the __________.calorieheatjoulewatt
- 10. 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 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.
- 11. 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
- 12. Multiple ChoiceWhich statement is true regarding endothermic reactions?a) Temperature change is positive and enthalpy change is positiveb) Temperature change is positive and enthalpy change is negativec) Temperature change is negative and enthalpy change is positived) Temperature change is negative and enthalpy change is negative
- 13. 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
- 14. Multiple Choice
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 of formation
The enthalpy of reaction
The enthalpy of combustion
The enthalpy of neutralisation
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