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Reaction of Alkali Metals with Water Observations Flame floats/surface, melts, bubbles/moves/fizz Behaviour NothingPopSplint Blue/baseLitmus SoftestSofterSoftHardness.

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Presentation on theme: "Reaction of Alkali Metals with Water Observations Flame floats/surface, melts, bubbles/moves/fizz Behaviour NothingPopSplint Blue/baseLitmus SoftestSofterSoftHardness."— Presentation transcript:

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2 Reaction of Alkali Metals with Water

3 Observations Flame floats/surface, melts, bubbles/moves/fizz Behaviour NothingPopSplint Blue/baseLitmus SoftestSofterSoftHardness Shiny / LustreAppear KNaLi

4 Answers to Questions The outer electron. Because positive and negative charges attract, but this attraction decreases with distance (like magnets). 4.K was most reactive because its outer electron is further away and thus easier to remove. Li is least reactive because its outer electron is closer and harder to remove. 1.K was most reactive, Li was least. 2.Li Na K 3 p+4 n03 p+4 n p + 12 n p + 20 n

5 Answers to Questions Rb, Cs, or Fr is more reactive There is not one that is less reactive 6.Litmus tested for hydroxide A flaming splint tested for hydrogen gas 7.The K beaker did not react because the hydrogen was already used up

6 Misconceptions 3.Electrons are attracted to protons with an electrostatic force, not magnetism or gravity. 4.K is not more reactive than Li because it has more electrons, it is because its outer electron is further from the nucleus. 7.CO 2 is not a product when a metal burns or when H 2 burns, only when the original substance contains C. In this case H 2 was burning and producing H 2 O. Excess N 2 and no H 2 (or O 2 ) can explain the splint going out.

7 Observations Flame (1) floats/surface, melts, bubbles/moves/fizz (3) Behaviour Nothing (1)Pop (1)Splint Blue/base (1)Litmus Softest (1)SofterSoftHardness Shiny / Lustre (1)Appear KNaLi Mark: /9

8 Answers to Questions The outer electron (1). Because positive and negative charges attract, but this attraction decreases with distance (like magnets). 4.K was most reactive because its outer electron is further away and thus easier to remove. Li is least reactive because its outer electron is closer and harder to remove.(1) 1.K was most reactive, Li was least (1) 2.Li Na K (1) /6 3 p+4 n03 p+4 n p + 12 n p + 20 n (1)

9 Answers to Questions Rb, Cs, or Fr is more reactive (1) There is not one that is less reactive (1) 6.Litmus tested for hydroxide (1) A flaming splint tested for hydrogen gas (1) 7.The K beaker did not react because the hydrogen was already used up (1) This slide: /5 Total: /20 For more lessons, visit


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