deducing formulae Flashcards

1
Q

what is the formula of aluminium sulfide

A

step 1
finding the group number for each element
aluminium -3
sulfur would be 2 as it is a non-metal so it is 8-6=2
step 2
swap the numbers

so the answer would be Al2S3

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2
Q

what is the formula of calcium bromide?

A

step 1
write the formulae of the ions Ca+ and Br-
step 2
balance the charges. we need two Br- to balance on Ca2+
step 3
write the formulae with the metal ion first CaBr3

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3
Q

what are state symbols

A

gas (g), liquid (l), solid(s)

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4
Q

what is an ionic equation

A

an equation showing only those ions and molecules taking part in the reaction.

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5
Q

what are spectator ions

A

ions which do not take part in a reaction.

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