Topic 6- Groupings in the periodic table (paper 2)
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what are properties of alkali metals?
• soft • low melting points
What happens to lithium in water?
• moves around on the surface • lots of fizzing (effervescence) → hydrogen gas • solution becomes alkaline
what happens to sodium in water?
• moves around on the surface • lots of fizzing (effervesence) → hydrogen gas • melts in the heat of the reaction • solution produced is alkali
what happens to potassium in water?
• moves around on the surface • lots of fizzing (effervesence) → hydrogen gas • melts in the heat of the reaction • flame produced as the potassium is hot enough to ignite the hydrogen • alkaline solution
word equation for the reaction of alkali metals and water
alkali metal + water → metal hydroxide + hydrogen
physical state and colour of chlorine at room temperature
green gas (poisonous)
physical state and colour of bromine at room temperature
red-brown liquid that gives off an orange vapour (poisonous)
physical state and colour of iodine at room temperature
dark grey crystalline solid → purple vapour when heated (poisonous)
what is the test for chlorine gas?
bleaches damp blue litmus paper red and then white
what is the trend of reactivity in the halogens?
more reactive going up the group
what type of reaction are halogen displacement reactions?
redox reactions
what change could be seen to suggest a displacement reaction has occured?
colour change of solution
what are properties of noble gases
• inert • low density
what does inert mean?
unreactive