This gallery contains 4 photos.
We observed a chemical change. We burned a match and looked at it under a microscope Miscope. These are the results we obtained.
After ten mintes we took a glass of and saw changes on rose petal. Instead of red it became pink. We put one petal under a Miscope and saw a bunch of white spots all over it which were caused by sulfur-dioxide influence. This was very interesting and taughtful experience.
And this we recorded when we mixed drop of blood with water:
Goal: Students were noticing the structure of crystal by looking trough microscope and on creative way connected what they saw with their knowledge about chemical structure.
Students were separated in four groups and each group has its own task.
First group had a task to observe under the microscope difference compounds with ionic character: KMnO4, K2Cr2O7 and CuSO4. Magnification was 40 times.
Second group: They made crystal bar model of kitchen salt (NaCl) by using modeling clay and toothpicks.
Third group: They made Mg-chloride and Na-oxide puzzles by using cardboard.
Fourth group: They made comic whose characters (water, salt and nitrogen from the air) are explaining types of chemical bond between their atoms.
In the of the class all groups were presenting their results and were discussing looks of crystals. They came with a conclusion why some crystals have specific shapes.
First we went to the Botanic Garden. There we took photos of the Pancic omorika. Than we went to Miljakovac forest which is near our school. We were looking for an insect called Trculjak, which is a protected species, but we didn’t find it. Then we took photos of plants. After that we went to the Topciderka River where we took samples of its water. That is all we did that day.
- Picea branches
Picea omorika is a coniferous tree species in the family Pinaceae which grows in a very small area in the nature, but is widespread in the parks throughout Europe and North America. It is used as a Christmas tree. It was discovered on Tara Mountain in 1875 by the botanist Joseph Pancic . That is a protected species.
A sparrow is a songbird that inhabits large parts of Europe and Asia. In Serbia they call it “a house sparrow”. It is a symbol of our town. Today it is the most common birds in the world. It lived only in Europe and Asia but people took it to the rest of the world. The total number of sparrows in Europe is between 130 and 270 million.
We went to Miljakovac forest and took pictures of different plant species. We managed to find fern only in coniferous forest area, just like the hellebore. There were lots of ferns in heaps but they were rare. Unlike the ferns, hellebore were spread a lot. Fern was easy to spot because it was bright green.
Although many people think that Belgrade lies on two rivers, there is a third one, the Topciderka. It is small and very polluted because waste fromthe sewage is flowing into it. While we were watching the samples from the river through a microscope, we saw something and we think those are the algae cells. You could see it there. We microscoped lymph from my finger. We saw a lot of white blood cells.