19 – Investigating the Heat of Combustion of Alcohols (LC 2027) (Leaving Cert Chemistry): Flashcards

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19 – Investigating the Heat of Combustion of Alcohols
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Heat of combustion definition

Energy released when 1 mole burns completely in oxygen

Calorimetry definition

Technique to measure heat transfer via temp changes in water

Why is copper used for the calorimeter?

Excellent heat conductor, ensures efficient heat transfer

Purpose of draught shield

Prevents air currents interfering with flame, improves accuracy

What type of reaction is alcohol combustion?

Exothermic (energy released to surroundings)

Heat transfer equation

m×c×ΔTm \times c \times \Delta T

Specific heat capacity of water

42004200 J kg−1^{-1} K−1^{-1} (or 4.24.2 kJ kg−1^{-1} K−1^{-1})

Specific heat capacity definition

Heat needed to raise 1 kg of substance by 1 K

What must be stirred during the experiment?

The water (gently, to ensure even heat distribution)

How does molecular length affect energy released?

Longer molecules release more energy (more bonds to break)

Main assumption in this experiment

All heat from burning alcohol goes into heating the water

Major source of error in experiment

Heat loss to surroundings

Why are experimental values lower than theoretical?

Heat losses, incomplete combustion, apparatus absorption

How is mass of alcohol burned found?

Weigh spirit burner before and after, find difference

Energy contribution per -CH2_2- group added

Approximately 650650 kJ/mol more energy release

Explore Leaving Cert Chemistry Revision Notes by Topics

Overview of Experiments (LC 2026)

Overview of Experiments (LC 2026)

1 – Carrying Out Flame Tests (LC 2027)

1 – Carrying Out Flame Tests (LC 2027)

2 – Detecting the Presence of Anions (LC 2027)

2 – Detecting the Presence of Anions (LC 2027)

3 – Measuring the Relative Molecular Mass of a Volatile Liquid (LC 2027)

3 – Measuring the Relative Molecular Mass of a Volatile Liquid (LC 2027)

4 – Verifying the Law of Conservation of Mass (LC 2027)

4 – Verifying the Law of Conservation of Mass (LC 2027)

5 – Investigating Decreases in Concentration (LC 2027)

5 – Investigating Decreases in Concentration (LC 2027)

6 – Preparing Sodium Carbonate (LC 2027)

6 – Preparing Sodium Carbonate (LC 2027)

7 – Standardising a Hydrochloric Acid Solution (LC 2027)

7 – Standardising a Hydrochloric Acid Solution (LC 2027)

Show more

4 – Verifying the Law of Conservation of Mass (LC 2027)

4 – Verifying the Law of Conservation of Mass (LC 2027)

5 – Investigating Decreases in Concentration (LC 2027)

5 – Investigating Decreases in Concentration (LC 2027)

6 – Preparing Sodium Carbonate (LC 2027)

6 – Preparing Sodium Carbonate (LC 2027)

7 – Standardising a Hydrochloric Acid Solution (LC 2027)

7 – Standardising a Hydrochloric Acid Solution (LC 2027)

8 – Standardising a Sodium Hydroxide Solution (LC 2027)

8 – Standardising a Sodium Hydroxide Solution (LC 2027)

9 – Determining the Concentration of an Ammonia Solution (LC 2027)

9 – Determining the Concentration of an Ammonia Solution (LC 2027)

10 – Determining the Concentration of Ethanoic Acid in Vinegar (LC 2027)

10 – Determining the Concentration of Ethanoic Acid in Vinegar (LC 2027)

11 – Standardising a Potassium Permanganate Solution (LC 2027)

11 – Standardising a Potassium Permanganate Solution (LC 2027)

12 – Determining the Percentage of Elemental Iron in an Iron Tablet (LC 2027)

12 – Determining the Percentage of Elemental Iron in an Iron Tablet (LC 2027)

13 – Standardising a Sodium Thiosulfate Solution (LC 2027)

13 – Standardising a Sodium Thiosulfate Solution (LC 2027)

14 – Investigating the Rate of Decomposition of Hydrogen Peroxide (LC 2027)

14 – Investigating the Rate of Decomposition of Hydrogen Peroxide (LC 2027)

15 – Investigating the Effect of Surface Area on Reaction Rates (LC 2027)

15 – Investigating the Effect of Surface Area on Reaction Rates (LC 2027)

16 – Studying the Effect of Concentration on Reaction Rate (LC 2027)

16 – Studying the Effect of Concentration on Reaction Rate (LC 2027)

17 – Studying the Effect of Temperature on Reaction Rate (LC 2027)

17 – Studying the Effect of Temperature on Reaction Rate (LC 2027)

18 – Investigating Effects on the State of Equilibrium (LC 2027)

18 – Investigating Effects on the State of Equilibrium (LC 2027)

19 – Investigating the Heat of Combustion of Alcohols (LC 2027)

19 – Investigating the Heat of Combustion of Alcohols (LC 2027)

20 – Determining the Enthalpy of Reaction of a Neutralisation Reaction (LC 2027)

20 – Determining the Enthalpy of Reaction of a Neutralisation Reaction (LC 2027)

21 – Investigating Galvanic Cells (LC 2027)

21 – Investigating Galvanic Cells (LC 2027)

22 – Investigating with Inert Electrodes (LC 2027)

22 – Investigating with Inert Electrodes (LC 2027)

23 – Preparing & Investigating Ethene (LC 2027)

23 – Preparing & Investigating Ethene (LC 2027)

24 – Preparing an Ester (LC 2027)

24 – Preparing an Ester (LC 2027)

25 – Preparing Soap (LC 2027)

25 – Preparing Soap (LC 2027)

26 – Distinguishing Between Aldehydes and Ketones (LC 2027)

26 – Distinguishing Between Aldehydes and Ketones (LC 2027)

27 – Synthesising & Investigating Benzoic Acid (LC 2027)

27 – Synthesising & Investigating Benzoic Acid (LC 2027)

Explore Leaving Cert Chemistry Model Answers by Topics

Overview of Experiments (LC 2026)

Overview of Experiments (LC 2026)

1 – Carrying Out Flame Tests (LC 2027)

1 – Carrying Out Flame Tests (LC 2027)

2 – Detecting the Presence of Anions (LC 2027)

2 – Detecting the Presence of Anions (LC 2027)

3 – Measuring the Relative Molecular Mass of a Volatile Liquid (LC 2027)

3 – Measuring the Relative Molecular Mass of a Volatile Liquid (LC 2027)

4 – Verifying the Law of Conservation of Mass (LC 2027)

4 – Verifying the Law of Conservation of Mass (LC 2027)

5 – Investigating Decreases in Concentration (LC 2027)

5 – Investigating Decreases in Concentration (LC 2027)

6 – Preparing Sodium Carbonate (LC 2027)

6 – Preparing Sodium Carbonate (LC 2027)

7 – Standardising a Hydrochloric Acid Solution (LC 2027)

7 – Standardising a Hydrochloric Acid Solution (LC 2027)

Show more

4 – Verifying the Law of Conservation of Mass (LC 2027)

4 – Verifying the Law of Conservation of Mass (LC 2027)

5 – Investigating Decreases in Concentration (LC 2027)

5 – Investigating Decreases in Concentration (LC 2027)

6 – Preparing Sodium Carbonate (LC 2027)

6 – Preparing Sodium Carbonate (LC 2027)

7 – Standardising a Hydrochloric Acid Solution (LC 2027)

7 – Standardising a Hydrochloric Acid Solution (LC 2027)

8 – Standardising a Sodium Hydroxide Solution (LC 2027)

8 – Standardising a Sodium Hydroxide Solution (LC 2027)

9 – Determining the Concentration of an Ammonia Solution (LC 2027)

9 – Determining the Concentration of an Ammonia Solution (LC 2027)

10 – Determining the Concentration of Ethanoic Acid in Vinegar (LC 2027)

10 – Determining the Concentration of Ethanoic Acid in Vinegar (LC 2027)

11 – Standardising a Potassium Permanganate Solution (LC 2027)

11 – Standardising a Potassium Permanganate Solution (LC 2027)

12 – Determining the Percentage of Elemental Iron in an Iron Tablet (LC 2027)

12 – Determining the Percentage of Elemental Iron in an Iron Tablet (LC 2027)

13 – Standardising a Sodium Thiosulfate Solution (LC 2027)

13 – Standardising a Sodium Thiosulfate Solution (LC 2027)

14 – Investigating the Rate of Decomposition of Hydrogen Peroxide (LC 2027)

14 – Investigating the Rate of Decomposition of Hydrogen Peroxide (LC 2027)

15 – Investigating the Effect of Surface Area on Reaction Rates (LC 2027)

15 – Investigating the Effect of Surface Area on Reaction Rates (LC 2027)

16 – Studying the Effect of Concentration on Reaction Rate (LC 2027)

16 – Studying the Effect of Concentration on Reaction Rate (LC 2027)

17 – Studying the Effect of Temperature on Reaction Rate (LC 2027)

17 – Studying the Effect of Temperature on Reaction Rate (LC 2027)

18 – Investigating Effects on the State of Equilibrium (LC 2027)

18 – Investigating Effects on the State of Equilibrium (LC 2027)

19 – Investigating the Heat of Combustion of Alcohols (LC 2027)

19 – Investigating the Heat of Combustion of Alcohols (LC 2027)

20 – Determining the Enthalpy of Reaction of a Neutralisation Reaction (LC 2027)

20 – Determining the Enthalpy of Reaction of a Neutralisation Reaction (LC 2027)

21 – Investigating Galvanic Cells (LC 2027)

21 – Investigating Galvanic Cells (LC 2027)

22 – Investigating with Inert Electrodes (LC 2027)

22 – Investigating with Inert Electrodes (LC 2027)

23 – Preparing & Investigating Ethene (LC 2027)

23 – Preparing & Investigating Ethene (LC 2027)

24 – Preparing an Ester (LC 2027)

24 – Preparing an Ester (LC 2027)

25 – Preparing Soap (LC 2027)

25 – Preparing Soap (LC 2027)

26 – Distinguishing Between Aldehydes and Ketones (LC 2027)

26 – Distinguishing Between Aldehydes and Ketones (LC 2027)

27 – Synthesising & Investigating Benzoic Acid (LC 2027)

27 – Synthesising & Investigating Benzoic Acid (LC 2027)

Explore Leaving Cert Chemistry Quizzes by Topics

Overview of Experiments (LC 2026)

Overview of Experiments (LC 2026)

1 – Carrying Out Flame Tests (LC 2027)

1 – Carrying Out Flame Tests (LC 2027)

2 – Detecting the Presence of Anions (LC 2027)

2 – Detecting the Presence of Anions (LC 2027)

3 – Measuring the Relative Molecular Mass of a Volatile Liquid (LC 2027)

3 – Measuring the Relative Molecular Mass of a Volatile Liquid (LC 2027)

4 – Verifying the Law of Conservation of Mass (LC 2027)

4 – Verifying the Law of Conservation of Mass (LC 2027)

5 – Investigating Decreases in Concentration (LC 2027)

5 – Investigating Decreases in Concentration (LC 2027)

6 – Preparing Sodium Carbonate (LC 2027)

6 – Preparing Sodium Carbonate (LC 2027)

7 – Standardising a Hydrochloric Acid Solution (LC 2027)

7 – Standardising a Hydrochloric Acid Solution (LC 2027)

Show more

4 – Verifying the Law of Conservation of Mass (LC 2027)

4 – Verifying the Law of Conservation of Mass (LC 2027)

5 – Investigating Decreases in Concentration (LC 2027)

5 – Investigating Decreases in Concentration (LC 2027)

6 – Preparing Sodium Carbonate (LC 2027)

6 – Preparing Sodium Carbonate (LC 2027)

7 – Standardising a Hydrochloric Acid Solution (LC 2027)

7 – Standardising a Hydrochloric Acid Solution (LC 2027)

8 – Standardising a Sodium Hydroxide Solution (LC 2027)

8 – Standardising a Sodium Hydroxide Solution (LC 2027)

9 – Determining the Concentration of an Ammonia Solution (LC 2027)

9 – Determining the Concentration of an Ammonia Solution (LC 2027)

10 – Determining the Concentration of Ethanoic Acid in Vinegar (LC 2027)

10 – Determining the Concentration of Ethanoic Acid in Vinegar (LC 2027)

11 – Standardising a Potassium Permanganate Solution (LC 2027)

11 – Standardising a Potassium Permanganate Solution (LC 2027)

12 – Determining the Percentage of Elemental Iron in an Iron Tablet (LC 2027)

12 – Determining the Percentage of Elemental Iron in an Iron Tablet (LC 2027)

13 – Standardising a Sodium Thiosulfate Solution (LC 2027)

13 – Standardising a Sodium Thiosulfate Solution (LC 2027)

14 – Investigating the Rate of Decomposition of Hydrogen Peroxide (LC 2027)

14 – Investigating the Rate of Decomposition of Hydrogen Peroxide (LC 2027)

15 – Investigating the Effect of Surface Area on Reaction Rates (LC 2027)

15 – Investigating the Effect of Surface Area on Reaction Rates (LC 2027)

16 – Studying the Effect of Concentration on Reaction Rate (LC 2027)

16 – Studying the Effect of Concentration on Reaction Rate (LC 2027)

17 – Studying the Effect of Temperature on Reaction Rate (LC 2027)

17 – Studying the Effect of Temperature on Reaction Rate (LC 2027)

18 – Investigating Effects on the State of Equilibrium (LC 2027)

18 – Investigating Effects on the State of Equilibrium (LC 2027)

19 – Investigating the Heat of Combustion of Alcohols (LC 2027)

19 – Investigating the Heat of Combustion of Alcohols (LC 2027)

20 – Determining the Enthalpy of Reaction of a Neutralisation Reaction (LC 2027)

20 – Determining the Enthalpy of Reaction of a Neutralisation Reaction (LC 2027)

21 – Investigating Galvanic Cells (LC 2027)

21 – Investigating Galvanic Cells (LC 2027)

22 – Investigating with Inert Electrodes (LC 2027)

22 – Investigating with Inert Electrodes (LC 2027)

23 – Preparing & Investigating Ethene (LC 2027)

23 – Preparing & Investigating Ethene (LC 2027)

24 – Preparing an Ester (LC 2027)

24 – Preparing an Ester (LC 2027)

25 – Preparing Soap (LC 2027)

25 – Preparing Soap (LC 2027)

26 – Distinguishing Between Aldehydes and Ketones (LC 2027)

26 – Distinguishing Between Aldehydes and Ketones (LC 2027)

27 – Synthesising & Investigating Benzoic Acid (LC 2027)

27 – Synthesising & Investigating Benzoic Acid (LC 2027)

Explore Leaving Cert Chemistry Exam Questions by Topics

Overview of Experiments (LC 2026)

Overview of Experiments (LC 2026)

1 – Carrying Out Flame Tests (LC 2027)

1 – Carrying Out Flame Tests (LC 2027)

2 – Detecting the Presence of Anions (LC 2027)

2 – Detecting the Presence of Anions (LC 2027)

3 – Measuring the Relative Molecular Mass of a Volatile Liquid (LC 2027)

3 – Measuring the Relative Molecular Mass of a Volatile Liquid (LC 2027)

4 – Verifying the Law of Conservation of Mass (LC 2027)

4 – Verifying the Law of Conservation of Mass (LC 2027)

5 – Investigating Decreases in Concentration (LC 2027)

5 – Investigating Decreases in Concentration (LC 2027)

6 – Preparing Sodium Carbonate (LC 2027)

6 – Preparing Sodium Carbonate (LC 2027)

7 – Standardising a Hydrochloric Acid Solution (LC 2027)

7 – Standardising a Hydrochloric Acid Solution (LC 2027)

Show more

4 – Verifying the Law of Conservation of Mass (LC 2027)

4 – Verifying the Law of Conservation of Mass (LC 2027)

5 – Investigating Decreases in Concentration (LC 2027)

5 – Investigating Decreases in Concentration (LC 2027)

6 – Preparing Sodium Carbonate (LC 2027)

6 – Preparing Sodium Carbonate (LC 2027)

7 – Standardising a Hydrochloric Acid Solution (LC 2027)

7 – Standardising a Hydrochloric Acid Solution (LC 2027)

8 – Standardising a Sodium Hydroxide Solution (LC 2027)

8 – Standardising a Sodium Hydroxide Solution (LC 2027)

9 – Determining the Concentration of an Ammonia Solution (LC 2027)

9 – Determining the Concentration of an Ammonia Solution (LC 2027)

10 – Determining the Concentration of Ethanoic Acid in Vinegar (LC 2027)

10 – Determining the Concentration of Ethanoic Acid in Vinegar (LC 2027)

11 – Standardising a Potassium Permanganate Solution (LC 2027)

11 – Standardising a Potassium Permanganate Solution (LC 2027)

12 – Determining the Percentage of Elemental Iron in an Iron Tablet (LC 2027)

12 – Determining the Percentage of Elemental Iron in an Iron Tablet (LC 2027)

13 – Standardising a Sodium Thiosulfate Solution (LC 2027)

13 – Standardising a Sodium Thiosulfate Solution (LC 2027)

14 – Investigating the Rate of Decomposition of Hydrogen Peroxide (LC 2027)

14 – Investigating the Rate of Decomposition of Hydrogen Peroxide (LC 2027)

15 – Investigating the Effect of Surface Area on Reaction Rates (LC 2027)

15 – Investigating the Effect of Surface Area on Reaction Rates (LC 2027)

16 – Studying the Effect of Concentration on Reaction Rate (LC 2027)

16 – Studying the Effect of Concentration on Reaction Rate (LC 2027)

17 – Studying the Effect of Temperature on Reaction Rate (LC 2027)

17 – Studying the Effect of Temperature on Reaction Rate (LC 2027)

18 – Investigating Effects on the State of Equilibrium (LC 2027)

18 – Investigating Effects on the State of Equilibrium (LC 2027)

19 – Investigating the Heat of Combustion of Alcohols (LC 2027)

19 – Investigating the Heat of Combustion of Alcohols (LC 2027)

20 – Determining the Enthalpy of Reaction of a Neutralisation Reaction (LC 2027)

20 – Determining the Enthalpy of Reaction of a Neutralisation Reaction (LC 2027)

21 – Investigating Galvanic Cells (LC 2027)

21 – Investigating Galvanic Cells (LC 2027)

22 – Investigating with Inert Electrodes (LC 2027)

22 – Investigating with Inert Electrodes (LC 2027)

23 – Preparing & Investigating Ethene (LC 2027)

23 – Preparing & Investigating Ethene (LC 2027)

24 – Preparing an Ester (LC 2027)

24 – Preparing an Ester (LC 2027)

25 – Preparing Soap (LC 2027)

25 – Preparing Soap (LC 2027)

26 – Distinguishing Between Aldehydes and Ketones (LC 2027)

26 – Distinguishing Between Aldehydes and Ketones (LC 2027)

27 – Synthesising & Investigating Benzoic Acid (LC 2027)

27 – Synthesising & Investigating Benzoic Acid (LC 2027)

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