Last half term, year 4 have been learning about different states of matter in Science.
To understand why solids, liquids and gases have different properties, we examined the structure of each states. We learned that…
- Solid particles are packed tightly together which is why many solid objects are firm and do not bend.
- Liquid particles have a little bit of space between them which allows the particles to move. This is why liquids can be poured to take the shape of the container it is contained in.
- Gas particles have lots of space between them! This means that when gas is released, it disperses into the atmosphere really quickly! Think of what happens when you release the air from a balloon!
Changing states of matter: Melting and freezing
We then looked at how states can change! Did you know that solids could become a liquid by a process called melting? Did you know that liquids can change into a solid through the process of freezing?
We explored these reversible processes by doing an exciting rice crispies experiment! First we melted a solid bar of chocolate into a chocolate syrup. Next we covered the rice crispies with the melted chocolate mixture and put it in the fridge.
Can you guess what happened to the chocolate?
That’s right, it turned into solid chocolate again! If states of matter can change back to it’s original state, we call this a reversible change.
The Water Cycle:
Once we understood how states of matter can change from a solid to a liquid and a gas, we moves on to explore the water cycle.
To start with, we explored the scientific enquiry: what happens to a puddle during a hot, sunny day?
We learned that liquids change into a gas if there is heat. This process is called evaporation.
We also learned how clouds are formed. Did you know that clouds are just evaporated water droplets? When the water droplets cool down, they condense and become clouds!
If there are too many water droplets, the clouds get heavy and we have precipitation! This is when the clouds release all the water droplets in the form of rain, hail or snow.
The water the returns to rivers, oceans, the sea, or seeps back into the soil ready to start all over again.
At the end of our states of matter unit, we created our very own water cycle poster explaining the different ways water changes states in the water cycle.
Can you spot where evaporation, condensation, precipitation and collection happens in this diagram?