# science motion experiment

During Science class we are in the unit motion. We have done an experiment with motion detectors. In that experiment we had to move things so we could match a graph. We did that by moving back or front, at different speeds. Here are the graphs,  the blue lines are the beginning graphs and the red are the ones that we did.

For this graph we first moved back,  then at the straight line we kept the same speed and then we came closer again to get the line down.

Also on this picture, you cannot see the whole graph but I will also explain the last part that you cannot see.  I think we first went closer and then we went back and at the end we stood still because the end of the graph was in the middle.

For this one we went closer and then stopped for about a half second, then went closer and stopped again but for one second. After that I went back again.

 graph

For this last graph it was metres per seconds and for this graph we used a trash can to do the graph. But this graph was particularly difficult.  First I did not move, then I moved back to make the line go up. Then I did not move so It would get in the middle. Then I went fast closer so the graph would go down, but you cannot see that on the image.

# Science experiment

In science class we did an experiment of how to make hydrogen gas and then let it explode a little bit.
We made a video of that in fast motion and here is it:

Here is the experiment and how to do it is also in the video, I hope you learned how do do it!

# Dissection

During science class we have dissected a pig’s eye. We needed to label some parts of the eye an i have listed them on an image:

And here is how the eye works.
Fist the light waves go through the cornea, the layer that protects the pupil and the iris. Then the light goes through the pupil, the iris controls the size of the of the pupil because when it’s dark it makes your pupil big to let as much light waves in as possible so the you can see something. And when you look at something shining very bright  it makes your pupil small to let as less as possible amount of light waves in, because otherwise it hurts.
When the light waves went through the pupil it goes to the lens, the lens focusses the image. After that the image is formed on your cornea. Then the image is upside down because of the lens. When that is done the message of the image you see is sent to the brain by the optic nerve, the brain also flips the image again.
And the you see!

# I pads yes or no

In science we are talking about elements and compounds.
The illegal mined minerals are called conflict minerals,  Conflict minerals’ are minerals mined in conditions of armed conflict and human rights abuses . the most of them are mined in Congo.
What conflict minerals are mined in Congo?
Congo produces coltan, tin, gold and tungsten.
Who mines all those minerals?
The minerals are mined by normal citizens and the government does not pay enough money for the safety of the miners so that is why it is about the toughest job that exists. Also children work so for them it is even more exhausting.
Also the miners get barely enough money to survive. Because if they find lots of tin they get just five dollars.

Mostly they are not exported by Congo itself but mostly it is smuggled to Uganda and Rwanda and then then they go to other country’s.
Also the miners who do the hard work does not get the money of the minerals but mostly the army commanders and they  buy weapons from that money.

A mineral that is used a lot in i pads is tin It also mined in Congo and mining it is dangerous and also people get about 5\$ a day if they work really hard and find lots of tin.

So because if I see this I think we can continue the I pad program but I think we should not buy lots of new I pads.
I think if we stopped the I pad program the miners have worked really hard to make it and it is weird if you then just put the I pads away they have worked and been exhausted and not happy and you just put away what they have worked really hard for.

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Bibliography:
“Congo’s Conflict Minerals.” Conflict Minerals in D.R. Congo. Warchild, n.d. Web. 30 Sept. 2014
Simpson, Cam. “The Deadly Tin Inside Your Smartphone.” Bloomberg Business Week. Bloomberg, 23 Aug. 2012. Web. 02 Oct. 2014.
“Tin in Your Smartphone Threatens Life on Bangka.” Bloomberg Business Week. Bloomberg, n.d. Web. 01 Oct. 2014.

# Science salt and sand mixture separating experiment

For Science we had a project that we had to separate sand and salt which are mixed together. I will show you a way how to do that!

First you need : a 100 ml beaker with the salt and sand mixture in it (salt and sand about to 20ml in beaker,  about 50 ml of water, filter paper,funnel, retort stand, ring for retort stand, mixing stick or spoon, an empty beaker, bunsen burner, gas tap, matches, gauze mat, safety mat, tripod and safety goggles.
Method

1. Put the 50 ml water in the sand and salt mixture.
2. Mix it with the mixing stick/spoon until the salt is completely dissolved.
3. fold the filter paper and put the ring for the retort stand on the retort stand.
4.Put the filter paper in  funnel and the funnel in the ring.
5.Put a empty beaker underneath the ring with the funnel filter paper in it.
6.Put the water (with the salt dissolved in it) in the filter paper and let it leak in the beaker.(do this in more times because the filter paper is not big)
7. When that is done you need to  set up the bunsen burner (with all equipment see in image).
8. Put the beaker on the gauze mat on the tripod
9. Plug the rubber tube in to the gas tap
10. Lighten the mach then and hold it at the top of the bunsen burner
11.Put the bunsen on by scrolling the two sort of rings to the right and when that is done the upper one more to the right and  the bottom one to the left. Stop doing that until sou see a light/blue flame.(see Image.
12.Then evaporate all the water until there is no water left and then you will see just the solid salt!

 Bunsen burner equipment