https://padlet.com/snekhabala5/ChemMR_lyspuns24_7 en-us 2017-04-19 09:31:16 UTC 2026-01-01 06:54:27 UTC hello@padlet.com https://padletuploads.blob.core.windows.net/prod/187029628/702ecb49058c44ebd9bb5e221d5726d4/IMG_5674.jpg snekhabala5 https://padlet.com/snekhabala5/ChemMR_lyspuns24_7/wish/166964671 2017-04-19 09:57:23 UTC https://padlet.com/snekhabala5/ChemMR_lyspuns24_7/wish/166964671 snekhabala5 https://padlet.com/snekhabala5/ChemMR_lyspuns24_7/wish/166964699 ✅ Definitions :
• Elements : Pure substances that cannot be broken down into simpler substances by chemical methods.
• Compounds : are defined as pure substances made up of atoms of two or more elements chemically combined together.(can only be separated by chemical methods)
• Mixtures : Consist of different substances that are not chemically combined together.(can be separated with physical methods)
• Monatomic : consist of single atom
• Molecules of elements : are pure substances made up of two or more atoms of the same type chemically joined together.
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Key important points to take note of ..
• All substances which are composed of only one type of atom are called elements . 
• Elements can exist as MONATOMIC elements or as MOLECULES OF ELEMENTS. (find the meaning above)
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• Each element/Compound has its own unique physical properties; such as MELTING POINT and BOILING POINT. ]]> 2017-04-19 09:57:36 UTC https://padlet.com/snekhabala5/ChemMR_lyspuns24_7/wish/166964699 snekhabala5 https://padlet.com/snekhabala5/ChemMR_lyspuns24_7/wish/166968512 🔆🔆
The formation of a compound requires a chemical reaction. In the process , energy change is usually involved ; 
• Exothermic : when energy is given out TO the surrounding .(remember the word 'exit' which is somewhat like EXothermic) 
• Endothermic : when energy is taken in from the surrounding .(remember the word 'enter' which is somewhat like ENdothermic) 
• A COMPOUND has its own physical and chemical properties . But thy are different from its constituent elements. 
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••• A compound is made up of atoms of different elements chemically combined in a FIXED ratio. ]]> 2017-04-19 10:26:15 UTC https://padlet.com/snekhabala5/ChemMR_lyspuns24_7/wish/166968512 snekhabala5 https://padlet.com/snekhabala5/ChemMR_lyspuns24_7/wish/166969664 2017-04-19 10:35:10 UTC https://padlet.com/snekhabala5/ChemMR_lyspuns24_7/wish/166969664 snekhabala5 https://padlet.com/snekhabala5/ChemMR_lyspuns24_7/wish/166969929 🔆🔆🔆
• A mixture does not have a fixed composition by mass. 
•• When a pure substance is contaminated with impurities, a mixture is formed. The impurities can affect the MELTING and BOILING point of the pure substance.
•• The greater the amount of impurities, the lower the impure substance melts below its melting point.]]> 2017-04-19 10:37:20 UTC https://padlet.com/snekhabala5/ChemMR_lyspuns24_7/wish/166969929 snekhabala5 https://padlet.com/snekhabala5/ChemMR_lyspuns24_7/wish/166970692 2017-04-19 10:42:26 UTC https://padlet.com/snekhabala5/ChemMR_lyspuns24_7/wish/166970692 snekhabala5 https://padlet.com/snekhabala5/ChemMR_lyspuns24_7/wish/166971226 2017-04-19 10:45:54 UTC https://padlet.com/snekhabala5/ChemMR_lyspuns24_7/wish/166971226 snekhabala5 https://padlet.com/snekhabala5/ChemMR_lyspuns24_7/wish/166972829 🔆🔆
• Matter takes up space and has mass.
• Matter can exist in 3 different physical states ; which are SOLID, LIQUID and GAS. 
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• Kinetic particle theory states that :
Matter is made up of tiny particles. These tiny particles can be atoms, ions or molecules.
•The particles have kinetic energy and hence, are in constant and random motion .

]]> 2017-04-19 10:57:25 UTC https://padlet.com/snekhabala5/ChemMR_lyspuns24_7/wish/166972829 snekhabala5 https://padlet.com/snekhabala5/ChemMR_lyspuns24_7/wish/166973654 2017-04-19 11:03:25 UTC https://padlet.com/snekhabala5/ChemMR_lyspuns24_7/wish/166973654 snekhabala5 https://padlet.com/snekhabala5/ChemMR_lyspuns24_7/wish/166974657 2017-04-19 11:09:09 UTC https://padlet.com/snekhabala5/ChemMR_lyspuns24_7/wish/166974657