Reaction of Alkali Metals with Water Observations Flame floats/surface, melts, bubbles/moves/fizz...
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Transcript of Reaction of Alkali Metals with Water Observations Flame floats/surface, melts, bubbles/moves/fizz...
Reaction of Reaction of
Alkali Metals Alkali Metals
with Water with Water
ObservationsObservations
Flamefloats/surface, melts, bubbles/moves/fizz
Behaviour
NothingPopSplint
Blue/baseLitmus
SoftestSofterSoftHardness
Shiny / LustreAppear
KNaLi
Answers to Questions 1-4Answers to Questions 1-4
3. The outer electron. Because positive and negative charges attract, but this attraction decreases with distance (like magnets).
4. K was most reactive because it’s 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 n0 2 111 p+
12 n0 2 8 1 19 p+
20 n0 2 8 8 1
Answers to Questions 5-7Answers to Questions 5-75. Rb, Cs, or Fr is more reactive
There is not one that is less reactive6. Litmus tested for hydroxide
A flaming splint tested for hydrogen gas7. The K beaker did not react because the
hydrogen was already used up
MisconceptionsMisconceptions3. 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 it’s outer electron is further from the nucleus.7. CO2 is not a product when a metal burns or when H2 burns,
only when the original substance contains C. In this case H2 was burning and producing H2O. Excess N2 and no H2 (or O2) can explain the splint going out.
ObservationsObservations
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
Answers to Questions 1-4Answers to Questions 1-4
3. The outer electron (1). Because positive and negative charges attract, but this attraction decreases with distance (like magnets).
4. K was most reactive because it’s 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) (1)
/6
3 p+
4 n0 2 111 p+
12 n0 2 8 1 19 p+
20 n0 2 8 8 1
(1)
Answers to Questions 5-7Answers to Questions 5-75. 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: /5Total: /20
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