Properties of Water Experiments

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Basics on the topicProperties of Water Experiments

Want to do some water experiments at home? Learn three different water experiments you can do at home in this video!

TranscriptProperties of Water Experiments

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Properties of Water Experiments exercise

Would you like to apply the knowledge you’ve learned? You can review and practice it with the tasks for the video Properties of Water Experiments.
• Explain what will happen.

Hints

Why is it important that the water glass is not on a heater or near an open window?

If the water level went up, where did the extra water come from?

The water will gradually evaporate. What does evaporate mean? Is this a slow process or a fast one?

Solution
• The water level will go down slightly every two or three days. You can see this by marking the new level with a permanent marker every two or three days.
• The reason the water level goes down is due to evaporation.
It is important the glass is not near an open window or on a heater, as this will make the water evaporate too quickly to observe.
• What will happen?

Hints

The glass should be in the refrigerator for two to three hours. After you take it out into a warm room, how will the glass feel?

The glass should be in the refrigerator, NOT the freezer.

Condensation occurs when water vapor in warm air hits a cold surface and turns back into liquid form.

There are two correct sentences, and three false.

Solution

LIKELY RESULTS

• The glass and water will be very cold.
• The glass will have water droplets on the outside after a few minutes.
FALSE
• The glass and water will NOT be at room temperature after two hours in the refrigerator, because this experiment needs to be done on a warm day.
• The glass will NOT be dry on the outside because of the temperature difference between the water in the glass and the air around it.
• The water in the glass will NOT be frozen, because the glass should go in the refrigerator and NOT the freezer.

• What will happen?

Hints

The only way the glass with 100 grams of ice can be empty, is if the ice turns into gas and evaporates. Is it hot enough for the ice to melt, then boil, and turn into steam?

Although the ice has a larger volume than the liquid water (takes up more space), they both have exactly the same weight.

There is only one correct choice.

Solution

The glass with the original water, and the glass with the melted ice, will have the same amount of liquid after the ice melts. This is because even though the ice cubes take up more space than the liquid water, the weight is the same. Therefore, the amount of water is the same, even if it is in the form of ice.

• Explain what happened.

Hints

The water glass should not be near an open window or a heat source.

The water glass should be in a quiet place where no one and nothing disturbs it.

There are two correct sentences that should be highlighted, and three false ones.

Solution
• The water turned into water vapor over time.
• Water vapor evaporated out of the glass, making it more empty.
• Label the different phases of water.

Hints

Orange juice, milk, and anything you can pour is a liquid.

Cream is a liquid and ice cream is a solid.

If you try to touch a gas or vapor, you may not even feel it, and your hand will go straight through.

Solution

The different phases of water are:

• Solid as ice
• Liquid as water
• Vapor or gas as a cloud

• Explain the result.

Hints

Water has three forms:

• Solid (ice)
• Liquid (water)
• Vapor or gas (steam, clouds, mist, and so forth)

One of the choices is used twice in two separate sentences.

When water turns from a solid to a liquid, this is melting. When water turns from a liquid to a gas, this is evaporation, and when water turns from a gas to a liquid, this is condensation.

Solution

1) The glass became very cold in the refrigerator. When you took the glass out, there was a difference in temperature between the glass and the warm air.

2) There is always water vapor in the air on Earth. This stays in gas form in the warm air.

3) When the water vapor in the warm air hits the cold glass, it condenses and turns into liquid form.

4) The water droplets on the outside of the glass are actually condensed water vapor from the air outside the glass!