the periodic table

what is periodicity ?
is a regular periodic variation of properties of elements with atomic number and position in the periodic Table
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what are the three factors that affect ionisation energies ?
nuclear charge , distance from the nucleus, electron shielding
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what happens to ionisation energies across a period ?
general increase across a period
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what happens to ionisation energies down a group ?
energys decrease down a group
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what is the trend in boiling points across a period ?
increase between 1 -4 , sharp decrease between 4-5 , low boiling points 5-8
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why is there a sharp decrease in boiling points between groups 4 and 5 ?
Because the structure if the elements change from giant structures to simple weak molecular forces
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name 3 physical properties of group two elements
they have reasonably high melting and boiling points , they are light metals with low densities , they form colourless compounds
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what happens to a group to element in a reaction ?
it becomes oxidised
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what happens to group to elements when they react with water ?
they form hydroxides with the general formula M(OH)2, and hydrogen gas is formed.
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what is thermal decomposition ?
the breaking up of a chemical substance with heat into at least two chemical substances
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what happens to group 2 oxides when they react with water ?
they form a solution of a metal hydroxide
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what happens when a group 2 hydroxide reacts with water ?
they form alkaline solutions
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what happens when a group 2 carbonate is decomposed ?
it forms a metal oxide and CO2
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name 2 physical properties of group 7 elements
they have low melting/ boiling points , they exist as diatomic molecules
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what happens to halogens in a reaction ?
they become reduced
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what is a displacement reaction ?
a reaction in which a more - reactive element displaces a less reactive element from an aqueous solution of the latters ions
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what is disproportionation ?
the oxidation and reduction of the same element in a redox reaction
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what are trends of group 7 elements and compounds?
less reactive down the group , and elements react with metal to form ionic halides with an X- ion.
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how do you test for halides ?
unknown halide is dissolved in water , then an aqueous solution of silver nitrate is added.. a coloured precipitate is formed
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what halides form what colour precipitates ?
chloride= white , Bromide= cream , iodide= yellow
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if you cannot judge the colour of a halide precipitate , what could you do ?
add aqueous ammonia , different halides have different solubilities
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Other cards in this set

Card 2

Front

what are the three factors that affect ionisation energies ?

Back

nuclear charge , distance from the nucleus, electron shielding

Card 3

Front

what happens to ionisation energies across a period ?

Back

Preview of the front of card 3

Card 4

Front

what happens to ionisation energies down a group ?

Back

Preview of the front of card 4

Card 5

Front

what is the trend in boiling points across a period ?

Back

Preview of the front of card 5
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