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Flashcards in topic 2 (bonding,structure...) Deck (13)
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1

properties of ionic compounds

high melting and boiling points(strong electrostatic force of attraction)

cannot conduct electricity when solid (as ions cannot move )

2

allotropes

allotropes are different structural forms of the same element in the same physical state

3

allotropes of carbon

diamond= is very hard ,does not conduct electricity and has a high melting point

graphite= is soft and slippery with a high melting point

graphine= is one layer of graphite

fullerenes =hollow balls of carbon

4

ionic compounds

many ionic form crystals ,ionic compounds form giant compounds and are 3 dimensional

5

states of matter

solid
liquid
gas

6

changing of state

solid
melting (down) freezing (up)
liquid
boiling (down) condensing (up)
gas

7

nanoparticles

A nanoparticle or ultrafine particle is usually defined as a particle of matter that is between 1 and 100 nanometres in diameter

uses:transparent sunglasses,coating for solar cells,self cleaning windows......

effects:this effects of inhaled nanoparticles are inflammation and heart problems

8

polymers

a polymers is a substance which has a molecular structure built up chiefly or completely from a large number of similar units bonded together, all atoms in a polymer are joined by covalent bonds

9

giant covalent structures

giant covalent structures are macromolecules (a molecule containing a very large number of atoms)
and these are joined together by strong covalent bonds

10

ionic bonds

attraction between a metal and a non-metal
the metal gives away its electron (and is a positive ion)
the non-metal gains electrons (and becomes a negative ion)

11

covalent bond

the attraction between two non-metals which share electrons

12

metallic bonding

is a type of bonding produced by electrostatic force of attraction between electrons and positive ions

13

properties of covalent bonds (molecules)

small covalent molecules have low melting and boiling points (meaning they're usually liquids or gases at room temperature )

they also do not conduct electricity (as they have no overall charge)