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Class VII-2020-21

PHYSICAL AND CHEMICAL CHANGES

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April 27, 2020

Dear students of class 7(3), I hope this help you to understand physical and chemical changes.

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CHEMISTRY CHAPTER - 1 (work sheet)

May 07, 2020

Dear students of class 7(3) write answer for the following work sheet.

( for understanding intermolecular force)

March 26, 2020

There are two kinds of forces, or attractions, that operate in a molecule— intramolecular and intermolecular . Let's try to understand this difference through the following example. Figure of towels sewn and Velcroed representing bonds between hydrogen and chlorine atoms We have six towels—three are purple in color, labeled hydrogen and three are pink in color, labeled chlorine . We are given a sewing needle and black thread to sew one hydrogen towel to one chlorine towel. After sewing, we now have three pairs of towels: hydrogen sewed to chlorine. The next step is to attach these three pairs of towels to each other. For this we use Velcro as shown above. So, the result of this exercise is that we have six towels attached to each other through thread and Velcro. Now if I ask you to pull this assembly from both ends, what do you think will happen? The Velcro junctions will fall apart while the sewed junctions will stay as is. The attachment created by Velcro...