GCSE Chemistry C2

(general) non metals react together by ... .... . when two atoms .... a pair of ..... they form a covalent bond . covalent bonds are .... .... . Any element or compound that is formed by atoms .... .... is called ......

(general) there are two types of covalent bonding these include

Many of the elements and compounds exist as small molecules and so we call thier structure

examples of compounds or elements that have a simple molecular structure include :

simple molecular - substances which are made of small molecules have relatively ... melting and boiling points this is because the ... of ..... ..... the molecules are very .... and so ... very much .... is needed to break them . we say these substances have .... ..... ... . it is is these ...... ........ ... that need to be overcome when these substances change state not the ...... ...... ... ...... the molecule

elements and compounds with a simple molecular structure do ... conduct electricity . this is because :
(simple molecular)

most molecular substances are ..... and ..... at room temperature but they can be ....
(simple molecular)

draw the structure of hydrogen
(simple molecular)

draw the structure of chlorine
(simple molecular)

draw the structure of water
(simple molecular)

draw the stucture of ammonia
(simple molecular )

draw the structure of hydrogen chloride
(simple molecular)

draw the structure of methane
(simple molecular)

draw the chemical structure for oxygen
(simple molecular)

fill in this table (simple molecular)

giant covalent structures are known as

giant covalent - in ginat covalent structures all the atoms are bonded to each other by ..... ... ...

giant covalent - giant covalent structures have very ..... melting and boiling points this is because :

ginat covalent - ginat covalent structures .... conduct electricity this is because :

ginat covalent - the main examples of macramolecules are

ginat covalent
in diamond each each carbon atomd forms .... covalent bonds in a very ..... ginat covalent structure . this structure makes diamond the .... natural substance so it's used for drill tips , and it's pretty sparkly to

ginat covalent - both diamond and graphit are only made up of ..... atoms

ginat covalent - silica is also known as ..... ... , this is what ..... is made of . Each grain of .... is one .... .... of ..... and ....

ginat covalent - in graphite each carbon atom only forms .... covalent bonds . This means that each carbon atom has ... .... that is not involved in a covalent bond and it is these .... ... ..... which can move and so enable graphite to ..... electricity each carbon atom forms .... which are ..... to .... .... .... ... , like a pack of cards - so graphite is .... and ..... .