- The ethilic alcohol helps the breakup of the bond between the fat acid and the glycerine, that is it favours the hydrolysis.
- The sodium chloride replaces the water and forms the molecules of soap.
- The sodium chloride is also called sodium hydroxide.
WELCOME
INTRODUCING
STUDENTS ARE GOING TO INTRODUCE THEMSELVES, THEIR SCHOOL AND THEIR COUNTRY.
1st step
Part 1 PEOPLE AND CHEMISTRY
INTRODUCE THE TOPIC
■ Do you have any chemicals/chemical products in your home?
■ What chemicals/chemical products do you have in your home?
INTRODUCE THE TOPIC
■ Do you have any chemicals/chemical products in your home?
■ What chemicals/chemical products do you have in your home?
2nd step
Part 2 CHEMISTRY IN OUR HOMES
In Parts 1 and 2 students find out more about the many
chemical products which people use in their homes. They also
examine the labelling of these products and learn about the
international symbols for labelling chemical substances.
They have an opportunity to make and test a chemical
product
In Parts 1 and 2 students find out more about the many
chemical products which people use in their homes. They also
examine the labelling of these products and learn about the
international symbols for labelling chemical substances.
They have an opportunity to make and test a chemical
product
STEP 3 LIVING WITH CHEMISTRY
STEP 3 LIVING WITH CHEMISTRY
Research by interview, or from secondary sources, to investigate a local story related to chemistry and to discover an example of the importance of chemistry to the local, regional or national economy.
Research by interview, or from secondary sources, to investigate a local story related to chemistry and to discover an example of the importance of chemistry to the local, regional or national economy.
mercoledì 3 giugno 2009
26.We put the mixture of alcohol, oil, caustic soda and water in the water with sodium chloride.
27.We put the mixture and we allowed to rest a little time.
28.We filtered with a filter paper and a funnel the content of the becker.
29.We got some micelles of soap.
30.We rinsed produced soap with water to remove caustic soda, used during the production of
the soap.
21.After saponification, we waited some seconds.
22.We removed the erlenmeyer flask from the becker on the heater.
23.We allowed to cool the mixture in the erlenmeyer flask.
24.We measured 15 grams of sodium chloride and 60 ml of water.
25.We put the water in a becker and we untied sodium chloride in the water in the becker.
11.We used a spalsher to add the water.
12.We used a turkey baster to remove the water in excess, in this way the water in the becker
didn’t fall in the erlenmeyer flask.
13.We took a fat:the extrravergin olive oil which is a mixture of triglicerides.
14.We measured 10 millimeters of olive oil.
15.We waited that the mixture of water, alcohol and caustic soda in the erlenmeyer flask boiled.
13.We took a fat:the extrravergin olive oil which is a mixture of triglicerides.
14.We measured 10 millimeters of olive oil.
15.We waited that the mixture of water, alcohol and caustic soda in the erlenmeyer flask boiled.
6.We added the caustic soda in the erlenmeyer flask.
7.We put on an heater a becher, full of water.
8.We waited that the water boiled in the becher.
9.We put the erlenmeyer flask (with the watrer, the alcohol and the caustic soda) in the becker.
10.We set the erlenmeyer flask on a clamp, because the mixture inside the beuta didn’t mix with
the water in the becker.
1.We measured 80 ml of water and 20 ml of ethilic alcohol in a graduated cylinder.
2.We filled the erlenmeyer flask with 80 ml of water.
3.We put inside the beuta 20 ml of ethilic alcohol, too.
4.We steared the mixture.
5.We measured 25 grams of caustic soda (the molecular mass of the caustic soda is 40 MM).
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- The ethilic alcohol helps the breakup of the bond ...
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- 21.After saponification, we waited some seconds.22...
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