alakline Flashcards

1
Q

give two observations when lithium reacts with water

A

bubbles
get smaller and dissappear
floats

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2
Q

give two observations when pottasium reacts with water

A

catches fire
floats on water
bubbles

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3
Q

explain why lithium is less reactive than pottasium
refer to atomic structure

A

li has a smaller atomic radium
so valence electron is attracted strongly to nucleus
cant be easily lost as k

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4
Q

give observatio would be different if k used instead of li

A

burn with a flame
reacts more vigrous
form a ball

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5
Q

identify the most reactive metallic element in the periodic table

A

francium

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6
Q

the elements in group 1 show a clear trend in some of the phisical proprities
identify the phisical property that shows a clear trend

A

melting point

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7
Q

when a peice of lithium is removed from the oil dried and cut the exposed surface

A

changes from shiny to dull

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8
Q

why lithium and sodium have simillar reactions with water

A

they have one electron in their valence shell

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9
Q

is melting point decrease or increase down group of alkaline metal

A

decrease

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10
Q

is denisty increase and decrease down group

A

increase

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11
Q

phisical properties of alkali metals

A

they have shiny silvery surface when freshely cut with a knife
they are soft metals
have low densties
they are good conductor of electricity and heat
they have low melting point

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12
Q

give me melting point of lithium

A

180

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13
Q

give me melting point of pottasium

A

64

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14
Q

why pottasium floats on water

A

as its less dense than waTER

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15
Q

WHAT IS THE lightest alkali metal

A

lithium

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16
Q

why they are called alkali metals

A

as they react with water forming alkaline solution

17
Q

why reactivity of alkali metal increase on descending group

A

as number of shells increase so distance between the valence electron and nucleus increases thus the valence electron is less firmly held to the nucleus and cant be lost easily

18
Q

sources of sodium chloride

A

sea water,ground rock salt deposits

19
Q

where metals are stored

A

store under oil /keresone

20
Q

why metals are store under keresoine

A

to isolate them from air and water

21
Q

observation when alkali react with oxygen

A

give a white oxide layer

22
Q

difference of li and k and na

A

lithium doesnt give a flame
na gives yellow flame
k gives a lilac flame

23
Q

why reaction is more violent in case of patossium than in case of sodium

A

pottasium is more active than sodium

24
Q

example of chemical equation alkali metal reacts with water

A

2li+2h2o=2lioh

+h2

25
reaction alkalis with air
4na+o2=2na2o
26
reaction alkali with halogen
2na+cl2=2nacl
27
uses of sodium
used in extraction of titanium
28
Uses of tatinum
Make body of rockets
29
Chemical equation of extraction of titanium
Ticl3+3Na=>Ti +3Nacl
30
What is meant by reactivity of metals
Tendency to lose it's valence electron
31
Observe li when put in cold water
Gas fizzes around it,float,metal chamge into ball and get smaller and disappear
32
Observation when k put in cold wayer
React violently,melt immediately, catch fire with lilac flame,floats,change into ball and get smaller and disappear in water