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Minor Versionm

by Vishal Bhatt

Introduction

Take ice, heat it to water, then to steam. Try and condense the steam into water and then put it back in the freezer to make ice.

    • Be careful while heating .

    • Use burner under adult supervision.

    • Do not ingest any of the materials.

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  1. Fill in your readings in a table such as this.
    • Fill in your readings in a table such as this.

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    • Take two vessels/beakers and add 50 ml of water to each one.

    • In one of them, add about 20g (1 tablespoon) of salt; stir it well.

    • Measure their temperature at this initial stage using a thermometer.

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    • Setup your heating equipment.

    • Once again, measure the temperature of water in both the vessels before heating.

    • Start heating both the vessels.Measure the temperature after 5 minutes.

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    • Record the temperature at 5-minute intervals.

    • Note down your readings till the water starts boiling.

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    • Pour 50 ml of water in two separate bowls .

    • Put about 1 tablespoon (~20g) of salt in one of the bowls.

    • Stir it well such that the salt dissolves completely .

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    • Measure both the initial temperatures and keep the bowls in the freezer.

    • Record the temperature at 5 minute intervals.

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    • Note down your readings till the water in each bowl freezes completely.

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    • Collect the salt water and normal water which are now completely frozen.

    • Let them thaw in the room and measure their temperature every 5 minutes.

    • Make a note of the temperature at each interval.

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    • Keep measuring the temperature at 5 minute intervals till the ice melts completely.

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    • You may now take the water in either bowl and put it in a vessel/beaker for heating.

    • Switch on the burner and put a lid on the vessel.

    • If the lid is transparent, you should notice the lid become cloudy as the water heats up. If not, then remove the lid as the water boils

    • Remove the lid and notice the steam slowly condense into water droplets on the lid.

    • Note that you have gone through the entire process of vaporising, freezing, melting and condensing water through the course of this experiment.

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    • Make sure you note down the readings at exactly 5-minute intervals .

    • Measuring the temperature, especially when there's a change of state, is imperative.

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    • How many states of matter did you observe?

    • Why does the water become cooler when you dissolve salt in it? What did you notice about the freezing point of salt water?

    • Which type of water has a higher boiling point?

    • Which type of ice melts faster? Salt water or fresh water?

    • Can you say something about the polar ice caps and the temperatures at the poles based on the freezing and thawing of ice?

    • If you are at a hill station, say 2000m or 3000m above sea level, are your readings significantly different from what we have shown? Why?

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Finish Line

Vishal Bhatt

Member since: 04/26/2017

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49 Guides authored

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