I never teach my pupils; I only attempt to provide the conditions in which they can learn. – Albert Einstein
Posted on September 28th, 2014 No comments
Organic and inorganic chemistry has been a very tricky subject for all students. You have to imagine the structure of the molecule. We have been allways doing them on the black boards. Drawing those complex 3 dimensional structures on a 2 dimensional surface can not provide us with ample structural benifits for the students to imagine the structure.
Why not make a cheap modelling system that can be made with daily house hold items, which can provide the students with lots of fun and in the same time teach them model making.
Posted on September 27th, 2014 No comments
One day this tyrant set up a tall pole in the public square, and put his own cap on the top of it, and then he gave orders that every man who came into the town should bow down before it. But there was one man, named William Tell, who would not do this. He stood up straight with folded arms, and laughed at the swinging cap. He would not bow down to Gessler himself.
When Gessler heard of this, he was very angry. He was afraid that other men would disobey, and that soon the whole country would rebel against him. So he made up his mind to punish the bold man.
William Tell’s home was among the mountains, and he was a famous hunter. No one in all the land could shoot with bow and arrow so well as he. Gessler knew this, and so he thought of a cruel plan to make the hunter’s own skill bring him to grief. He ordered that Tell’s little boy should be made to stand up in the public square with an apple on his head, and then he bade Tell shoot the apple with one of his arrows.
Tell begged the tyrant not to have him make this test of his skill. What if the boy should move? What if the bowman’s hand should tremble? What if the arrow should not carry true?
“Will you make me kill my boy?” he said.
“Say no more,” said Gessler. “You must hit the apple with your one arrow. If you fail, my soldiers shall kill the boy before your eyes.”
Then, without another word, Tell fitted the arrow to his bow. He took aim, and let it fly. The boy stood firm and still. He was not afraid, for he had all faith in his father’s skill.
The arrow whistled through the air. It struck the apple fairly in the center, and carried it away. The people who saw it shouted with joy.
As Tell was turning away from the place, an arrow which he had hidden under his coat dropped to the ground.
“Fellow!” cried Gessler, “what mean you with this second arrow?”
“Tyrant!” was Tell’s proud answer, “this arrow was for your heart if I had hurt my child.”
And there is an old story, that, not long after this, Tell did shoot the tyrant with one of his arrows, and thus he set his country free.
Posted on September 26th, 2014 No comments
The Periodic Table of Elements is a tabular display of the chemical elements, organized on a basis of their properties. Elements are presented in increasing atomic number while rectangular in general outline, gaps are included in the rows or periods to keep elements with similar properties together, such as the halogens and the noble gases, in columns or groups, forming distinct rectangular areas or blocks. Because the periodic table accurately predicts the properties of various elements and the relations between properties, its use is widespread within chemistry, providing a useful framework for analysing chemical behavior, as well as in other sciences.
Here is a fully functional periodic table that will help you find information about elements.
Try the new Periodic Table.
Posted on September 25th, 2014 No comments
When something is going straight, it always keeps going straight unless something else stops it or turns it. If it can’t go straight, then it goes as straight as it can. So when you hit a ball tied to a rope, it tries to go straight away from you. But the rope pulls on it and keeps the ball from going straight. So the ball goes as straight as it can – around the pole in a circle. That’s centrifugal force – the energy of something trying to go straight even though it can’t.
The Earth is affected by centrifugal force. It is moving, so it tries to keep moving in a straight line. But the gravity of the Sun pulls the Earth toward it, just as the rope pulls the ball. Gravity can’t pull the Earth into the Sun, because the Earth keeps trying to go straight. So the Earth takes a middle road, going in a circle around the Sun.
Following is a video about centrifugal force.
Posted on September 24th, 2014 No comments
Don Quixote liked to read. He liked to read a lot. He liked to read so much that he pretty much stopped doing everything else. This is not a good idea unless you are very rich, and he was not. He lived on a farm that had once been fairly prosperous and large, but in addition to ignoring his daily chores, he had begun to sell off pieces of his property in order to buy more books. But the real problem seemed to be his choice of books. He read every book about knights and knight-errantry he could get his paws on.