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Group One: The Alkali Metals

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Malvika Dahiya

on 25 November 2012

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Transcript of Group One: The Alkali Metals

Alkali Metals Alkali Metals: Introduction Reactions of Lithium, Sodium and Potassium
with Water and Oxygen: 2 Potassium and Oxygen Reaction Group 1
A collection of relatively soft metals showing a trend in melting reacting with oxygen and water.
Consists of:
lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs),and francium (Fr) ("Chemical Elements").
Very reactive.

("BBC Bitesize") Reactions of Lithium, Sodium and Potassium with Water and Oxygen Reaction with Water ( H2o)
Hydroxide is produces for all the metals
Fizzes steadily then disappears.
Melts and forms a ball which moves.
Fizzes rapidly.
Orange flame.
Melts and floats.
Moves quickly.
Fire with sparks and lilac flame.
Small explosion.

("BBC Bitesize") Reactions with Cold Water (H2o)
lithium + water -> lithium hydroxide + hydrogen
2Li(s) + 2H2O(l) -> 2LiOH(aq) + H2(g)
sodium + water -> sodium hydroxide + hydrogen
2Na(s) + 2H2O(l) -> 2NaOH(aq) + H2(g)
potassium + water -> potassium hydroxide + hydrogen
2K(s) + 2H2O(l) -> 2KOH(aq) + H2(g) Reactions with Oxygen (O) Lithium:
lithium+oxygen -> lithium oxide
4Li(s) + O2(g) -> 2Li2O(s)
sodium + oxygen -> sodium oxide.
4Na(s) + O2(g) -> 2Na2O(s)
potassium + oxygen -> potassium oxide.
4K(s) + O2(g) -> 2K2O(s) ("BBC Bitesize") ("GCSE Science") By Malvika Dahiya Properties of Alkali Metals Reaction with Oxygen (O)
Burns in air.
Red flame.
Burns in air.
Orange flame.
Burns in air.
Lilac flame. ("GSCE Science") Melting and Boiling Points Densities of the Alkali Metals Hardness of the Alkali Metals
Francium= softest Patterns? Thank you! :) ("Youtube") ("BBC Bitesize") ("Chem Guide") Bibliography "Alkali Metals." Chemical Elements. N.p., n.d. Web. 12 Nov. 2012. <http://www.chemicalelements.com/groups/alkali.html>.
"Atomic and Physical Properties of Periodic Table Group 1." Chem Guide. N.p., n.d. Web. 15 Nov. 2012. <http://www.chemguide.co.uk/inorganic/group1/properties.html>.
"Group One Properties." BBC Bitesize. BBC, n.d. Web. 10 Nov. 2012. <http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_pre_2011/periodic_table/group1rev2.shtml>.
"The Periodic Table." GSCE Science. N.p., n.d. Web. 15 Nov. 2012. <http://www.gcsescience.com/pt7.htm>.
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