The Periodic Table (Part 2)

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Presentation transcript:

The Periodic Table (Part 2) 13/09/2018 The Periodic Table (Part 2) WJEC GCSE Applied Science Our Planet : 1.3.2 Obtaining Resources

Lesson Objectives By the end of this lesson you should: 13/09/2018 By the end of this lesson you should: Be able to identify the alkali metals and the halogens in The Periodic Table Be able to write equations for the reactions of the alkali metals and the halogens.

Group 1 – The alkali metals 13/09/2018 Li Na K Rb Cs Fr

13/09/2018

Flame tests 13/09/2018 Compounds containing lithium, sodium and potassium can be recognised by burning the compound and observing the colours produced: Lithium Red Sodium Yellow Potassium Lilac

Reactions with water 13/09/2018

Group 1 – The alkali metals 13/09/2018 Some facts… 1) These metals all have ___ electron in their outer shell 2) Reactivity increases as you go _______ the group. This is because the electrons are further away from the _______ every time a _____ is added, so they are given up more easily. 3) They all react with water to form an alkali (hence their name) and __________, e.g: Potassium + water potassium hydroxide + hydrogen 2K(s) + 2H2O(l) 2KOH(aq) + H2(g) Words – down, one, shell, hydrogen, nucleus

Group 7 – The Halogens 13/09/2018 F Cl Br I At

13/09/2018

Reactions of halogens 13/09/2018

Group 7 – The Halogens Decreasing reactivity Some facts… 13/09/2018 Decreasing reactivity Some facts… 1) Reactivity DECREASES as you go down the group 2) At room temperature chlorine is a green gas, bromine is an orange liquid and iodine is a grey solid 3) Chlorine is used to sterilise water while iodine is used to sterilise wounds 4) Melting point, boiling point and density all increase going down the group 5) Reactions with group 1 metals: metal+ halogen metal halide sodium + chlorine sodium chloride

13/09/2018 Plenary A technician found that the labels had come off bottles containing the alkali metals lithium, sodium and potassium. Describe a simple test she could carry out to identify the metals. Give a safety precaution she must take and describe the expected observations for each metal.