Chem 1st Page
- Created by: Natasha
- Created on: 05-04-13 18:31
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- Chemistry
- Isotope are different forms of the same element
- Has same number of -protons but different number of electrons.
- Ionic Bonding- Lose or gain electrons
- Have similar properties- High melting and boiling points. Dissolve easily
- Covalent bonding- Share electrons to get the full outer shell
- A covalent bond is a shared pair of electrons
- Examples in book Page 47
- Giant covalent bonfs are Macromolecules
- No charged ions, Dont conduct electricity, Diamond and graphite for example.
- Metals are made up of free electrions
- Alloys (a mix of two metals) are harder than pure metals.
- Thermosoftening polymers- forces between chains easy to over come. Easy to melt. Can remould when need again
- Thermosetting polymers- crosslinks hold it in solid structure. Doesnt soften. Strong, hard and rigid.
- Relative atomic mass is the same as the mass number.
- Relative formula mass is mass number= M(r)
- Number of moles= mass in grams/ M(r)
- Isotope are different forms of the same element
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