What are the properties of water?

Targets

At the end of this Unit you should be able to answer the following questions 

1. What are the properties of pure substances and mixtures?

1.1 What are the properties of water?

1.2 How can mixtures be identified?

1.3 How can mixtures be separated?

2. What is a chemical reaction?

2.1 What is the difference between a physical change and chemical change?

targets

Pixabay
     

Water is unique and important in so many ways. It can exist on Earth as a solid, a liquid, or a gas. Liquid water fills our oceans while water vapour (gas) is in the air we breathe. We can skate on solid water (ice).

Water has no smell, no taste, and no colour, but without it, there would be no life on Earth. If it smells, tastes odd, or has some colour, it has impurities in it! Chemical reactions required for living occur in the water because of its amazing ability to dissolve most substances.

Think about a typical day and list all the ways you might use water.


Pixabay
Different materials melt at different temperatures. This is called the melting point. The melting point of water in 0°C. This is when ice becomes a liquid.

Different liquids become a gas at different temperatures. This is called the boiling point. The boiling point of water is 100°C.

To change the physical of state of water from a solid to a liquid, or a liquid to a gas, what needs to be added?


  Video

You can review phase changes (solid, liquid, and gas) with Bill Nye the Science Guy:

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Or, review the three states of matter by watching the BrainPop: States of Matter video.
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