Date: 20th May nnnnnnnnnnnnnnnnnnnnnnnn\nPartner: Theo, Erica, Raymond
Packing Pellets in Water
To see what happens to packing pellets when they are in water.
Small beaker, room temperature water, packing pellets
- Fill the small beaker with water.
- Place the packing pellet in the water.
- Record your observations of the pellet as time goes by.
- Record the times down.
- The packing pellet will expand.
- The pellet will absorb a small amount of water.
Results: 10:40am – 10:45am
- The pellet was floating.
- The pellet wasn’t moving, slowly sinking, falling apart
- Expanding, flat, sinking, absorbing water
- looks soggy, looks fluffy
- Expanding even more, floating less
- same amount?
The packing pellet was absorbing small amounts of water and slowly started to dissolve into a liquid. My hypothesis was right because the pellet did expand and absorbed small amounts of water.
There are many ways to separate mixtures like: Chromatography, this is good for separating dissolved substances that are in mixtures/liquids, filtration, this is good for separating insoluble substances from liquids such as rocks from water, evaporation, this is good for separating salt from water, you let the water evaporate and the salt stays and lastly, simple distillation. It’s the exact same to evaporation except you cool the gas down to get the water back.
Click here to go Bitesize’s site.
Today, we went to the science lab and we were setting up our anti-rusting experiments. My partner and I didn’t set ours up but we had fun watching everyone else.
If you want to know more about the experiments, please go to my other post: http://layla2014.global2.vic.edu.au/2014/06/17/conducting-a-science-experiment/
For my experiment, I predict that the nail that will be painted, will have hardly any rust on it because of the paint. The nail without paint will have rust on it, depending on what type of nail it is. (I prefer iron nails)
We all had to make POE charts. (predict, observe, explain) This is my chart:
- Why don’t some metals rust?
- Why does it take some things longer to rust than others?
- Why do materials rust?
- What does rust look like?
- How can rust be prevented?
- Why do we need rust?
- Is rusting important?
- Can the metal in a Olympic medal rust?
- Some metals don’t rust because some of the metals don’t get affected by oxygen so they don’t rust.
- It takes some metals longer to rust because some of them haven’t been affected by oxygen before but after it might take a little longer.
- Metal rusts as a result of iron coming into contact with water or air. When the water combines with air on the metal, carbonic acid is formed and the iron is dissolved hence making some of the water to break down into hydrogen and oxygen. When the oxygen comes into contact with the iron, iron oxide is formed making the metal to rust.
Materials rust because oxygen is reacting with the metal creating rust, then wearing away the rust.
- The unsightly orangy-brown mess that accumulates on metal is a highly unattractive feature that plagues many different objects, especially cars, trucks, screws, bolts, and tools.
Rust can be prevented by covering the metal in plastic, greasing it or even painting it!
- Rust is like metal growing old, almost like humans growing older and then dying. So rust is like a human, growing older then fading away.
- Rusting is important because it’s like us because if we don’t grow, nothing grows, so rust is like growing and it is also getting warn out by weather, letting you know that you need more metal.
- They are made of silver so they might rust sometime soon
Conducting a Science Experiment
- Water (150ml x2)
To find a way for metal (nail) to have the least amount of rust.
- Take one beaker and fill it with 150ml of water.
- Take the other beaker and fill it with 150ml of water.
- Paint one nail and let it dry completely.
- Put the unpainted nail in one beaker and the painted nail in the other beaker.
- Let the beakers sit for at least 12 hours. Observe and explain the results. Compare both nails.
Fair Test Table:
|Nail coated in paint then put in water.
||Measure of how much rust is on both nailsTime=12-24 hours
||Same materials except paint on one nail150ml of water
||Nail put in water.
There are millions of mixtures and compounds. For example: Iron sulphide is a compound and iron, sulphur is a mixture. You can take compounds and mixtures apart, separating it into the different substances but you can only take apart compounds with another chemical reaction. You can separate mixtures with a magnets and other things but with iron sulphur, you would mainly use magnets.
On the 21st of May, 2014, 5/6B went to GTAC (Gene Technology Access Centre). We went there by bus/tram and we went to GTAC to learn how changing temperature can affect the state of a substance. We left school at about 8:50 to catch the 508 9:00 am bus. We then caught a 19 tram to Melbourne Uni. We were split into groups for after the first session. We also went there because it was Education Week and the theme was ‘Scientists do amazing things’. For our activities, my favourite on was the phosphate test because we got some household items, apparently they were phosphate free. We did some phosphate tests and we proved whoever made them wrong! We learnt a lot at GTAC and here are some of the things I learnt.
If a solid, like dry ice, skips the liquid state, it is called sublimation. Dry ice doesn’t melt so it can’t evaporate but I don’t know why dry ice skips the liquid state. Condensation is a new word we learnt. It means that the droplets outside of a glass with icy cold water in it, the glass draws the hot air to it but cools down the air so it turns into droplets.
I now know that there is a such thing called water fleas, called daphnia and they live in water, dirty water but they can still live in filtered water. I also know how you get the clean drinking water. You get the dirty water and flocculate it. Flocculate is a liquid that sends the dirty stuff in water to the bottom. You then let the dirt settle to the bottom and then filter the water. You chlorinate it and then you have you have the drinking water we have today.
A question I’m left with is: Does the physical change to substances only happen at a certain temperature? Also, why does dry ice skip the liquid state?