C6 Groups in the Periodic Table
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What are the physical properties of alkali metals?
• Low melting and boiling points • Very soft
Why are group 1 metals so reactive?
They only have one electron in their outer shell so they easily lose it
What colour is chorine at room temperature?
A green gas
What colour is bromine at room temperature?
Red-brown liquid that gives off an orange vapour
What colour is iodine at room temperature?
Grey solid which gives off a purple vapour
How do you test for chlorine?
Hold damp blue litmus paper which turns white if chlorine is present
What are the properties of group 0 elements?
• Colourless gases at room temperature • Non-flammable • Low density
What are some uses for group 0 gases?
• Argon is used in filament lamps because it is non-flammable • Argon and Helium protect metals that are being welded by stopping the hot metal reacting with oxygen • Helium is used in airships and party balloons as it has a lower density than air so it floats
How can you measure the rate of reactions?
• Precipitation reaction with a black cross • Measure the change in mass • Measure the volume of gas given off