In a report of an experiment to measure the specific latent heat of vaporisation of water, a student wrote the following. "Steam at 100 °C was added to cold water in a calorimeter. When the steam had condensed, measurements were taken. The specific latent heat of vaporisation of water was then calculated." Draw a labelled diagram of the apparatus used. List two measurements that the student took before adding the steam to the water. How did the student find the mass of steam that was added to the water? How did the student make sure that only steam, and not hot water, was added to the calorimeter? Give one precaution that the student took to prevent heat loss from the calorimeter.

Leaving Cert Physics Heat & Heat Transfer: In a report of an experiment to

In a report of an experiment to measure the specific latent heat of vaporisation of water, a student wrote the following - Leaving Cert Physics - Question 2 - 2005

Question 2

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In a report of an experiment to measure the specific latent heat of vaporisation of water, a student wrote the following. "Steam at 100 °C was added to cold water i... show full transcript

Worked Solution & Example Answer:In a report of an experiment to measure the specific latent heat of vaporisation of water, a student wrote the following - Leaving Cert Physics - Question 2 - 2005

Step 1

Draw a labelled diagram of the apparatus used.

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Answer

The diagram should include:

A calorimeter containing cold water.
A thermometer to measure the temperature of the water.
A steam generator or steam delivery tube to introduce steam into the calorimeter.
An insulation layer around the calorimeter to reduce heat loss.
Label each part clearly.

Step 2

List two measurements that the student took before adding the steam to the water.

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Answer

The initial temperature of the cold water in the calorimeter.
The mass of cold water in the calorimeter.

Step 3

How did the student find the mass of steam that was added to the water?

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Answer

The mass of steam added can be calculated by:

Weighing the calorimeter with water before the steam is added (initial mass).
Weighing the calorimeter with the condensed steam after the experiment (final mass).
The mass of steam is then given by:

$M_{steam} = M_{final} - M_{initial}$

where $M_{final}$ is the mass of the calorimeter with water and condensed steam, and $M_{initial}$ is the mass of the calorimeter with water.

Step 4

How did the student make sure that only steam, and not hot water, was added to the calorimeter?

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Answer

The student ensured that only steam was added by:

Insulating the steam generator and delivery system to prevent hot water from condensing before it entered the calorimeter.
Collecting steam directly from the generator into the delivery tube, ensuring that it is delivered in vapor form.

Step 5

Give one precaution that the student took to prevent heat loss from the calorimeter.

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Answer

One precaution could be covering the calorimeter with an insulated lid to minimize heat exchange with the environment.

In a report of an experiment to measure the specific latent heat of vaporisation of water, a student wrote the following - Leaving Cert Physics - Question 2 - 2005

Worked Solution & Example Answer:In a report of an experiment to measure the specific latent heat of vaporisation of water, a student wrote the following - Leaving Cert Physics - Question 2 - 2005

Draw a labelled diagram of the apparatus used.

List two measurements that the student took before adding the steam to the water.

How did the student find the mass of steam that was added to the water?

How did the student make sure that only steam, and not hot water, was added to the calorimeter?

Give one precaution that the student took to prevent heat loss from the calorimeter.

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