A student investigates the combustion of four liquid fuels. She uses 1.0 g of each fuel. Look at her results. Fuel Temperature of water (°C) before heating after heating A Butanol 41 B Ethanol 39 C Methanol 37 D Propanol 43 Which fuel releases the most energy into the water?

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A student investigates the combustion of four liquid fuels - OCR Gateway - GCSE Chemistry Combined Science - Question 2 - 2019 - Paper 3

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A student investigates the combustion of four liquid fuels. She uses 1.0 g of each fuel. Look at her results. Fuel Temperature of water (°C) before heating after ... show full transcript

Worked Solution & Example Answer:A student investigates the combustion of four liquid fuels - OCR Gateway - GCSE Chemistry Combined Science - Question 2 - 2019 - Paper 3

Step 1

Calculate the temperature change for each fuel

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Answer

To find out which fuel releases the most energy into the water, we first need to calculate the temperature change for each fuel using the formula:

$\text{Temperature Change} = \text{Temperature after heating} - \text{Temperature before heating}$

Now, calculate for each fuel:

Butanol: (41 - 21 = 20,°C)
Ethanol: (39 - 21 = 18,°C)
Methanol: (37 - 15 = 22,°C)
Propanol: (43 - 22 = 21,°C)

Step 2

Identify the fuel with the highest temperature change

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Answer

Comparing the temperature changes:

Butanol: 20°C
Ethanol: 18°C
Methanol: 22°C
Propanol: 21°C

The fuel that releases the most energy into the water is Methanol with a temperature change of 22°C.

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A student investigates the combustion of four liquid fuels - OCR Gateway - GCSE Chemistry Combined Science - Question 2 - 2019 - Paper 3

Worked Solution & Example Answer:A student investigates the combustion of four liquid fuels - OCR Gateway - GCSE Chemistry Combined Science - Question 2 - 2019 - Paper 3

Calculate the temperature change for each fuel

Identify the fuel with the highest temperature change

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