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Chapter: 7th Science : Term 1 Unit 3 : Matter Around Us

Points to remember

7th Science : Term 1 Unit 3 : Matter Around Us : Points to remember

Points to remember

* An atoms is the smallest particle of an element

* Elements are the simplest forms of pure substances

* Molecules of an element consist of a fixed number of one type of atom

* Molecules of a compound consist of a fixed number of different types of atom

* The molecules of the different element nitrogen and oxygen make up 99 percent of the air

* The particulate nature of matter can be used to explain heating effect of Solid, Liquid and Gas

 * The mass of the matter remains same during expansion

* A molecule is made up of two or more atoms chemically combined

* We can represent a molecule using the chemical formula.


ICT CORNER

Matter around us

Let’s build the molecules.


PROCEDURE :

Step 1: Use the URL to reach stimulation page. Click ‘Download’ and launch the stimulation.

Step 2: Drag the atoms from the kit which is at the bottom of the display to ‘make molecule’. Click on “3D” to see the molecule in 3 dimension. And drag that molecule to ‘Your molecule collection’ on the left side window.

Step 3: Click on the ‘collect multiple’ tab on the top of the window for more molecules.

Step 4: Click on the ‘Larger molecules’ tab to make larger molecules.


Matter around us URL:

https://phet.colorado.edu/en/simulation/build-a-molecule

*Pictures are indicative only

*If browser requires, allow Flash Player or Java Script to load the page.


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