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level: S3 Revision

Questions and Answers List

Question	Answer
What is a compound made up of?	Two or more elements chemically joined
what do compounds ending in -ide contain?	two elements
what do compounds ending in -ite or -ate contain?	three elements one being oxygen
how do non-metal elemetns join together?	by sharing electrons to form covalent bonds
what type of elements do covalent bonds consist of	non metal elements
what is a covalent bond	a shared pair of electrons
what does a diatomic molecule contain	two atoms joined together
what type of melting and boiling points do covalent substances made of molecules have?	low melting and boiling points
what type of melting and boiling points do covalent network substances have?	very high melting and boiling points
do covalent substances conduct electricity?	no, not in any state
what is an ion?	a charged atom
how are ionic compounds formed?	the transfer of electrons when metal elements react with non-metal elements
what type of elements do ionic compounds contain?	metal and non-metal
what happens when metal atoms lose electrons (refer to ions)	they form positive ions
what happens when non metal atoms gain electrons (refer to ions)	they form negative ions
what is an ionic bond?	the electrostatic attractions between oppositely charged ions
what type of melting and boiling points do ionic compounds have?	very high melting and boiling points
do ionic compounds conduct?	yes depending on the state
in what state do ionic compounds conduct	molten in solution
do ionic compounds conduct in the solid state?	no