Hydrogen peroxide

Next week we are going to be doing two different practicals which are part of Chemistry.  The first one will use hydrogen peroxide, and the second one will use detergent (among other things).  For today, try and find the following information on these chemicals:
For Hydrogen peroxide:

1. Its chemical formula.
2. What properties it has and what it can be used for.
3. Why it occurs in the body.
4. How it is broken down and what the products are.

For detergent:

1. The main chemical that makes it up.
2. The different characteristics of the two ends of the molecule.
3. How it cleans oil or food off dishes.
4. What forces occur between molecules in a bowl of water.

Some websites to give you a hand:
http://www.madsci.org/posts/archives/1999-09/938519528.Bc.r.html - info on hydrogen peroxide.

http://en.wikipedia.org/wiki/Hydrogen_peroxide - structure and formulas.

http://www.google.co.uk/imgres?imgurl=http://www.chemistryland.com/CHM107/Water/Soap02.jpg&imgrefurl=http://www.chemistryland.com/CHM107/Water/WaterQuiz.html&h=358&w=500&sz=36&tbnid=sOTCFK3LGgzENM:&tbnh=93&tbnw=130&prev=/search%3Fq%3Dsoap%2Bmolecules%26tbm%3Disch%26tbo%3Du&zoom=1&q=soap+molecules&hl=en&usg=__o0cJB9QQUBgI4mOIVgz4-1dDy0w=&sa=X&ei=RakWTq33GtC4hAewrcnMBQ&ved=0CCMQ9QEwBA - Information on what detergent does in water.

Finally....
Complete this crossword, trying to keep cheating at a minimum! (Sami).  http://www.creative-chemistry.org.uk/funstuff/xword/rates.htm
Once you're finished, have a look at this website - http://www.canaryzoo.com/Chemistry%20Games.htm

Animal testing

Following on from the milgram experiment we saw last week, we're going to look at ethics today.  Here's the  video from last week if you want a refresh:

This experiment places stress on the people involved, and so raises issues about whether it is wrothwhile.  Animal testing is another area that raises a similar issue.

Task for today: Use the following links to find out more about the animal testing issue, then answer the questions here in your books:

1. Explain why animals are used in research
2. Are animals treated cruelly in research? Do they suffer? Describe any suffering they may go through.
3. Name some products/materials that have been developeed using animal testing.
4. Decide whether you support animal testing or not, and explain why.  Make sure you justify your stance!

http://news.bbc.co.uk/1/hi/uk/4767875.stm  :    RECENT NEWS INFO

http://www.bbc.co.uk/science/hottopics/animalexperiments/    VIEWPOINTS

http://news.bbc.co.uk/cbbcnews/hi/find_out/guides/animals/animal_testing/newsid_2149000/2149767.stm                         NEWSROUND – CHILD FRIENDLY INFO    

http://www.pro-test.org.uk/               THE PRO USE OF ANIMALS GROUP

http://www.thebodyshop.com.au/ourValues.cfm?valueID=1  BODY SHOP VIEWPOINT

http://www.buav.org/                                   ANTI ANIMAL TESTING GROUP



I.T. lesson

This morning we will be doing some research for a prac experiment we will be doing next week.  You will need some background information that you will collect today, and after planning the experiment tomorrow we will be ready for next week.
The experiment will be investigating how much juice we can get from a certain amount of apple using enzymes.
Use the internet to find answers to the questions on your sheets, this link may be useful if you're stuck:
http://www.sciencebuddies.org/science-fair-projects/project_ideas/BioChem_p010.shtml

This one is a page from bitesize giving some information about enzzymes:
http://www.bbc.co.uk/schools/ks3bitesize/science/organisms_behaviour_health/diet_drugs/revise5.shtml

Last of all, try any of the activities on this page:
http://reviewgamezone.com/game.php?id=196

Make sure you keep your sheets to refer to tomorrow.

Moments

Here are some slides that we used when we were looking at moments.  The two slides at the end are saying that if the two opposite moments are equal the see saw won't move.  This means that two different weights can be put at different distances from the pivot and balance.
https://docs.google.com/leaf?id=0BzFUvVu_WNI_NTVjNGQ1ODEtYzNlZi00NDQ4LWJmMzktOGNiNDk1ODc0MjYx&hl=en&authkey=CNX8n74D

Alterations

I'm not sure why little bits of text keep getting changed around, but for the first example you're trying to find the pressure, which is f divided by a ( or 10 N / 5cm squared), which equals 2 N/cm.  This should help you work out the later questions.

Pressure in Fluids

https://docs.google.com/leaf?id=0BzFUvVu_WNI_Yjg4NTU5N2UtNWNmMC00OTc3LWEzNmEtMzFhOTQzY2M3OWRl&authkey=CNrI0bwE&hl=en

This is the link to the slideshow that we used today.  Remember that pressure = force x area, and then use the worked example on the slide to try the summary questions at the end.  We won't have another lesson until next Tuesday so make sure you have a go at this in the meantime!

Moments

We started pressure and moments today, and completed a practical on moments.  You need to remember that a moment is the turning effect of a force, and can be calculated by using the formula:

moment (Newton meters) = Force (newtons) x Distance from pivot (meters).

 So to lift or move something thats heavy using a lever you can either use more force or lengthen the distance between teh force (where you are pushing) and the pivot.  Tomorrow we will be using this to cover more material so make sure you know how to use the equation.