Science Unit 3 - Notes #2

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Water freezes at _ ° Celsius.

0

Density: _ gram per cubic centimeter

1

Water boils at _ ° Celsius.

100

What percentage of earth is made of water?

71%

Non-polar substances _________ with water.

Do not mix

Give an example of cohesion

Droplets of dew on grass

Define cohesion in your own words.

Holds water molecules together, causes it to stick to each other

Define adhesion in your own words.

Holds water to a surface

Why do humans sweat and dog pant? Explain the purpose and the reason both are effective.

Humans sweat because we have skin and it cools us down. Dogs pant because they have fur. This it effective because it helps regulate body temperature.

Water's unique properties are due to ______________

Hydrogen bonding

What causes surface tension in water?

Hydrogen bonds cause the molecules to stick to each other on top of the water.

High Specific Heat

Hydrogen bonds release heat when they break and form. It takes a lot of energy to heat water, freeze water and melt ice.

Water on earth is found in

Ice caps, freshwater lakes, salt lakes, rivers, ocean, underground, and atmosphere.

Give an example of surface tension

Insects can walk on water

Water has unique properties because of.....

It's positive and negative ends and it is polar

Chromatography

Method used to separate complex mixtures using capillary action.

Polar substances ___ with water.

Mix

Meniscus

The curved surface at the top of a column of liquid caused by adhesion.

How does water get to the leaves in the tops of the tallest trees against the force of gravity. Explain how this property works.

This happens because of capillary action. This is when water can climb up plants by cohesion and adhesion working together.

Two hydrogen atoms, one oxygen

Water

Because water has a high specific heat.....

Water stabilized the temperature of the earth.

Give an example of adhesion.

Water sticks to glass after it is washed.

Why does ice float on water?

ice floats because it is less dense and the molecules are farther apart.


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