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Properties and Changes of Materials Autumn Term Two

Ice Cream Making - (properties and changes of materials)

After the initial 'showing what we know' about properties and changes of materials, the Pine Class pupils who didn't go on the residential trip made, and then ate, their own ice cream. 

The vanilla essence and castor sugar was dissolved into the milk through stirring, then put into a sealed plastic bag.  This was then placed into a larger, sealed plastic bag that was full of ice cubes and some salt.  Gloves were needed as the bags got very cold!!   Then, the bags were shaken for quite a while, until the liquid turned into a solid due to the cold and the movement.  The milk solution became ice cream! This was quickly eaten, before it could melt back into a liquid again. 



States of Matter Autumn Term One

States of Matter

Further investigations in this term included:

Do all liquids freeze? 

In this investigation we froze different liquids for a week.  To ensure a fair test we used the same amount of each liquid, in the same containers, in the same freezer for the same amount of time.  

We found out that the ketchup, water, salt water, shampoo and washing up liquid froze.  However the hand sanitiser didn't.  We think this was due to its alcohol content.

Where does water go? 

We investigated how different conditions affect the evaporation rate of a wet cloth.   First we weighed a dry cloth, then we made it wet and weighed it again.  We hung them up in different environments inside and outside the classroom and recorded their weight and the temperature of the location over the course of the day.  Cloths in the sunny side of the class or outside dried quicker which told us the warmer the temperature, the quicker the evaporation rate.  We found out that water evaporates into water vapour.   We produced graphs to show our results. 

Balloon and Paper Science Magic

We found out what happens when baking soda is mixed with an acidic liquid, in this case vinegar.  It produces the gas Carbon Dioxide.  This blew up the balloons when we tipped the soda from inside the balloon to inside the plastic bottle containing the vinegar.   It also created a little heat because of the energy of the reaction. 

Next we filled cups with water and placed paper over the top.  On turning them upside down, the paper miraculously stuck to the cup and didn't fall.  We found out that this was because the water could not come out of the cup, unless air was let in.   The air could not get in because it was pushing the card upwards, the water pressure decreased inside the cup and the surface tension created a seal between the card and the cup. 

See our pictures below. 

States of Matter 

Are all liquids runny? 

Pine Class investigated whether all liquids are 'runny'.  We discussed the term 'viscosity' and found out it meant how much friction a liquid had and how much resistance was created when flowing.  In other words, how 'runny' it is.   We also found out that some liquids are colloids - they have a mixture of substances, such as toothpaste or creams.  Non Newtonian liquids were also investigated.  We watched a video of a man walking on custard and found out that some liquids become solids when impacted.  This was further investigated through the use of corn flour mixed with water in class.  We also found out that this technology can be used when making protective clothing such as for motorbike riders and the scientists invented something called Armour Gel.

States of Matter

Pine Class have been investigating the three states of matter:  solids, liquids and gases.  

Everyday items were classified and sorted into sorting hoops, however it proved very tricky and led to lots of discussion about whether an object was made of all three states.  Good thinking Pine! 

We then made gasses visible, poured solids and investigated how liquids fill different spaces.