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Margrette Dolores R. Lopez Grade 7-Maalalahanin

The student conducted an experiment to test whether coffee dissolves faster in hot or cold water. The hypothesis was that coffee dissolves faster in hot water. Two trials were conducted where coffee was added to boiling water and cold water, and the time taken for complete dissolution was measured. Both trials showed coffee dissolved significantly faster, within seconds, in hot water compared to over 5 minutes in cold water. Based on the results, the conclusion was that coffee dissolves faster in hot water due to hot water molecules moving faster and providing more energy.

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87 views2 pages

Margrette Dolores R. Lopez Grade 7-Maalalahanin

The student conducted an experiment to test whether coffee dissolves faster in hot or cold water. The hypothesis was that coffee dissolves faster in hot water. Two trials were conducted where coffee was added to boiling water and cold water, and the time taken for complete dissolution was measured. Both trials showed coffee dissolved significantly faster, within seconds, in hot water compared to over 5 minutes in cold water. Based on the results, the conclusion was that coffee dissolves faster in hot water due to hot water molecules moving faster and providing more energy.

Uploaded by

isteypaniflor
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© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Margrette Dolores R.

Lopez

Grade 7- Maalalahanin

Experiment #1

Problem:

Does coffee dissolve faster in hot or cold water?

Hypothesis:

Coffee dissolves faster in hot water.

Materials:

1. 2 Tbsp coffee
2. 1 cup boiling water
3. 1 Cup cold water
4. 2 cups
5. Stopwatch

Procedure:

1. Put water in the refrigerator for at least one hour.


2. Boil water.
3. Prepare 1 Tbsp of coffee for the hot water and 1 Tbsp of coffee for the cold water separately
4. Pour the boiled water into one of the coffee containers and time until the coffee is completely
dissolved.
5. Pour the cold water into the other coffee container and time until the coffee is completely
dissolved
6. Compare the results for the hot water and cold water.

Observation:

 For the first trial, it took 12.10 seconds for the coffee to be completely dissolved in the hot
water. Whereas it took 7 minutes and 16.97 seconds for the coffee to dissolve in the cold water
completely.
 For the second trial, it took 10.17 seconds for the water to be completely dissolved in the hot
water. Whereas, it took 6 minutes and 44.19 seconds for the coffee to be dissolved in the cold
water.
 The coffee dissolved immediately when the hot water was poured but the mixture needed to be
stirred for the coffee to be dissolved in the cold water.
 Less hot water is needed to dissolve the coffee than cold water.

Conclusion:

I therefore conclude that coffee dissolves faster in hot water.

This is because when water is heated, the molecules gain energy and, thus, move faster. The added
energy in the hot water causes water molecules to move faster and coffee molecules to vibrate faster.

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