Science 4th grade | UNIT 3: Solids‚ liquids and gases 3.1 Matter
What is matter?
Matter is everything around us.
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Matter exists in three different states. A state of matter is called a phase. These phases are known as solid, liquid or gas.
It is Suni's tenth birthday party. Identify two solids, two gases and one liquid on his birthday table.
Gases in air
Air is everywhere around us. Air is a mixture of different gases. We can't see or smell the gases in air. A gas called nitrogen makes up 4÷5 of the air.
Air also contains a gas called oxygen. We need oxygen to live. We breathe in oxygen. We breathe out a gas called carbon dioxide, which is also found in air.
Some gases do have a colour. Some gases also have a smell. Hydrogen sulfide smells like rotten eggs.
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Activity 3.1 (Making carbon dioxide)
You will need: Vinegar - bicarbonate of soda - a glass bottle - a surgical or rubber glove - an elastic band
Put some bicarbonate of soda in a surgical or rubber glove. Then, fill the glass bottle halfway with vinegar. Attach the glove carefully to the bottle using an elastic band. Ensure that you do not mix the bicarbonate of soda and the vinegar whilst attaching the glove. Once attached, shake the bicarbonate of soda into the vinegar. Observe what happens. The gas you have made is carbon dioxide.
Questions
1) What state of matter is:
a: vinegar b: bicarbonate of soda c: produced in the reaction?
2) Draw a picture to show what happened when the vinegar and bicarbonate of soda mixed together. Label the liquid and the gas.