Enthalpy change

Last updated: 04/02/2020

AQA A-Level Chemistry Energetics Enthalpy change

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Question 1 of 38

1. Question
What is the definition of enthalpy change?
- Potential energy that lies in between bonds
- Heat energy
- Energy in a reaction
- Attraction between molecules
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Question 2 of 38

2. Question
What symbol is used to signify enthalpy change?
- ΔH°
- ΔH
- Δ
- °C
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Question 3 of 38

3. Question
What is the definition of enthalpy?
- Thermal energy stored in a chemical reaction
- Electrical energy stored in a chemical reaction
- The change of energy throughout a chemical reaction
- Potential energy stored in a chemical reaction
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Question 4 of 38

4. Question
What is the definition of a chemical system?
- Atoms and bonds involved in a chemical reaction
- A system of thermal energy
- Everything other than atoms and bonds in a chemical reaction
- Energy changes
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Question 5 of 38

5. Question
What are the surroundings of a chemical reaction?
- Everything other than atoms and bonds in a chemical reaction
- A system of thermal energy
- Atoms and bonds involved in a chemical reaction
- Energy changes
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Question 6 of 38

6. Question
What is the definition of thermodynamics?
- Physical chemistry that focuses on the energy within a chemical system
- Chemical energy
- Focuses on the energy within the surroundings of a chemical reactions
- Thermal energy
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Question 7 of 38

7. Question
What is the conservation of energy law?
- The amount of energy that leaves a chemical system is the same as the amount of energy going into the surroundings
- The amount of energy that leaves a chemical system is different to the amount of energy going into the surroundings
- The energy that is gained within a reaction
- The energy that is lost within a reaction
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Question 8 of 38

8. Question
What happens between bonds when chemicals react?
- They are broken, forming new bonds
- Nothing happens
- They break apart
- They are formed
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Question 9 of 38

9. Question
How are thermal energy changes measured?
- Through temperature changes
- With a pH probe
- Through a colour change
- Through gas production
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Question 10 of 38

10. Question
What is the definition of an exothermic reaction?
- A reaction where there is a heat loss from the chemical system
- A reaction that involves a change in enthalpy
- A reaction where there is a heat gain to the chemical system
- A reaction with no change in heat within the chemical system
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Question 11 of 38

11. Question
What is the definition of an endothermic reaction?
- A reaction where there is a heat gain to the chemical system
- A reaction that involves a change in enthalpy
- A reaction where there is a heat loss from the chemical system
- A reaction with no change in heat within the chemical system
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Question 12 of 38

12. Question
What happens to the surroundings when heat is lost from a chemical system?
- There is a heat gain, along with a temperature increase
- There is a heat gain, along with a temperature decrease
- There is a heat loss, along with a temperature increase
- There is a heat loss, along with a temperature decrease
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Question 13 of 38

13. Question
What happens to the surroundings when heat is gained in a chemical system?
- There is a heat loss, along with a temperature decrease
- There is a heat gain, along with a temperature decrease
- There is a heat loss, along with a temperature increase
- There is a heat gain, along with a temperature increase
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Question 14 of 38

14. Question
Describe the change in enthalpy within an exothermic reaction.
- The enthalpy of the products is less than the enthalpy of the reactants
- The enthalpy of the products is the same as the enthalpy of the reactants
- The enthalpy of the products is greater than the enthalpy of the reactants
- There is no enthalpy change
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Question 15 of 38

15. Question
Describe the change in enthalpy within an endothermic reaction.
- The enthalpy of the products is greater than the enthalpy of the reactants
- The enthalpy of the products is the same as the enthalpy of the reactants
- The enthalpy of the products is less than the enthalpy of the reactants
- There is no enthalpy change
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Question 16 of 38

16. Question
Describe the enthalpy change sign for an exothermic reaction.
- It is negative
- It is positive
- Nothing
- There is no enthalpy change, so no sign
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Question 17 of 38

17. Question
Describe the enthalpy change sign for an endothermic reaction.
- It is positive
- It is negative
- Nothing
- There is no enthalpy change, so no sign
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Question 18 of 38

18. Question
For a graph with the variables, enthalpy and the progress of a reaction, describe the position of both the products and reactants for an exothermic reaction.
- Products are lower than the reactants
- Products are higher than the reactants
- Products are only slightly higher than the reactants
- Both lie at the same point
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Question 19 of 38

19. Question
For a graph with the variables, enthalpy and the progress of a reaction, describe the position of both the products and reactants for an endothermic reaction.
- Products are higher than the reactants
- Products are lower than the reactants
- Products are only slightly higher than the reactants
- Both lie at the same point
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Question 20 of 38

20. Question
Which state are substances considered in their standard conditions?
- Most stable form
- Solid
- Gaseous
- Liquid
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Question 21 of 38

21. Question
What is the standard condition for pressure in kPa?
- 100 kPa
- 10 kPa
- 1,000 kPa
- 10,000 kPa
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Question 22 of 38

22. Question
What is the standard condition for pressure in Pa?
- 100,000 Pa
- 100 Pa
- 1,000 Pa
- 100,000,000 Pa
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Question 23 of 38

23. Question
What is the standard condition for temperature in K?
- 298 K
- 200 K
- 283 K
- 270 K
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Question 24 of 38

24. Question
What is the standard condition for temperature in ℃?
- 0 ℃
- 10 ℃
- 1 ℃
- 5 ℃
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Question 25 of 38

25. Question
What is the definition for the enthalpy change of a reaction?
- The energy change associated with a given reaction, in standard conditions.
- A reaction under standard conditions.
- The energy change associated with a neutralisation reaction.
- The energy change associated with a given reaction.
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Question 26 of 38

26. Question
Which symbol is used to signify the enthalpy change of a reaction?
- $Δ_rH°$
- $_rH°$
- $_r°$
- $Δ_r°$
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Question 27 of 38

27. Question
Write the general equation for enthalpy change.
- $ΔH = H _{products} – H _{reactants}$
- $ΔH = H _{products} + H _{reactants}$
- $ΔH = H _{reactants} – H _{products}$
- $ΔH = H _{reactants} + H _{products}$
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Question 28 of 38

28. Question
What is the definition for the enthalpy change of formation?
- The energy change when one mole of a compound is formed from its constituent elements in their standard conditions.
- The energy change when one mole of a gaseous compound is formed from its constituent elements in their standard conditions.
- The energy change when a compound is formed.
- The energy change when a compound is formed from its constituent elements in their standard conditions.
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Question 29 of 38

29. Question
What symbol is used to signify enthalpy change of formation?
- $Δ_fH°$
- $Δ_fH$
- $ΔH°F$
- $R_fH°$
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Question 30 of 38

30. Question
Write the equation for the standard enthalpy change of formation of hexane, use state symbols.
- $C_6(s) + 7H_2(g) -> C_6H_{14}(l)$
- $C_6(s) + 7H_2(g) -> C_5H_{14}(g)$
- $C_5(s) + H_2(g) -> C_5H_{14}(l)$
- $C_6(s) + 7H(g) -> C_2H_{14}(l)$
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Question 31 of 38

31. Question
What is the definition for the enthalpy of combustion?
- The energy change when one mole of a substance is completely combusted.
- The energy change when a substance is completely combusted.
- The energy change when two moles of a substance are completely combusted.
- The energy change when one mole of a gaseous substance is completely combusted
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Question 32 of 38

32. Question
What symbol is used to signify enthalpy change of combustion?
- $Δ_cH°$
- $ΔH°$
- $C$
- $ΔC$
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Question 33 of 38

33. Question
Write the equation for the standard enthalpy change of combustion of ethane, use state symbols.
- $C_2H_6(g) + 3½O_2(g) -> 2CO_2(g) + 3H_2O(l)$
- $C_2H_6(l) + 3O_2(g) -> 2CO_2(g) + 3H_2O(l)$
- $C_2H_6(g) + O_2(g) -> CO_2(g) + H_2O(l)$
- $C_2H_6(g) + 3O_2(g) -> 2CO_2(g) + H_2O(l)$
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Question 34 of 38

34. Question
Write the equation for the standard enthalpy change of combustion of butane, use state symbols.
- $C_4H_{10}(g) + 6½O_2(g) -> 4CO_2(g) + 5H_2O(l)$
- $C_4H_{10}(g) + O_2(g) -> CO_2(g) + H_2O(l)$
- $3C_4H_{10}(g) + 3O_2(g) -> 4CO_2(g) + 5H_2O(l)$
- $C_4H_{10}(g) + 6O_2(g) -> 4CO_2(g) + 5H_2O(l)$
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Question 35 of 38

35. Question
Write the equation for the standard enthalpy change of combustion of methanol, use state symbols.
- $CH_3OH(l) + 1½O_2(g) -> CO_2(g) + 2H_2O(l)$
- $CH_3OH(l) + O_2(g) -> CO_2(g) + 2H_2O(l)$
- $CH_3OH(l) + O_2(g) -> CO_2(g) + 2H_2O(l)$
- $2CH_3OH(l) + 1½O_2(g) -> CO_2(g) + 2H_2O(l)$
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Question 36 of 38

36. Question
What is the definition for the enthalpy of neutralisation?
- The energy change associated with the formation of one mole of water within a neutralisation reaction.
- The energy change of a neutralisation reaction.
- The energy change associated with the formation of water within a neutralisation reaction.
- The energy change associated with the formation of two moles of water within a neutralisation reaction.
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Question 37 of 38

37. Question
Write the equation for the standard enthalpy change of neutralisation for the reaction between sodium hydroxide and hydrochloric acid, use state symbols.
- $NaOH(aq) + HCl(aq) -> NaCl(aq) + H_2O(l)$
- $NaOH(aq) + 2HCl(aq) -> 2NaCl(aq) + H_2O(l)$
- $NaOH(aq) + HCl(aq) -> NaCl(aq)$
- $NaOH(aq) + HCl(aq) -> NaCl(aq) + H_2(g)$
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Question 38 of 38

38. Question
What symbol is used to signify enthalpy change of neutralisation?
- $Δ_NeutH°$
- $Δ_NH°$
- $_NH°$
- $Δ_N°$
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