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Chemistry µGCSE:

Alkali Metals

10 quick questions - for GCSE and iGCSE

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10 minutes maximum! (can you do it in 5?)


 
1. Group 1 elements all react in a similar way because they ….
  • A: are all listed in the same group on the Periodic Table.
  • B: are all silver colored metals.
  • C: all have one outer electron.
  • D: all have a low density and melting point.

Q2-3. Small, similar sized pieces of three different alkali metals, X, Y and Z, were added to water.
The time taken for each piece to react completely was recorded:

Metal Time taken to react (s)
X 29
Y 7
Z 45
Potassium in water
Tavoromann | CC-BY-SA 3.0

2. The order of reactivity of these metals from most to least reactive is ….

  • A.    X>Y>Z
  • B.    Z>Y>X
  • C.    Y>X>Z
  • D.    Z>X>Y

3. X, Y and Z could be ……

  X Y Z
A sodium potassium lithium
B sodium lithium potassium
C potassium sodium lithium
D lithium potassium sodium
4. Three observations that would be made when a small piece of sodium is added to water in a trough are …
  • A: sodium sinks, fizzes and becomes smaller and disappears
  • B: sodium sinks, melts into a ball and becomes smaller and disappears
  • C: sodium floats, fizzes and becomes smaller and disappears
  • D: sodium floats, melts into a ball and burns with a lilac flame
5. The word equation for the reaction between sodium and water is …
  • A: sodium + water  sodium oxide +  hydrogen
  • B: sodium + water  sodium hydroxide + hydrogen
  • C: sodium + water  sodium hydroxide +  oxygen
  • D: sodium + water  sodium hydride + oxygen

6. The alkali metals, lithium, sodium and potassium, react vigorously with the halogens, chlorine, bromine and iodine.

Which of these is the most vigorous reaction combination?

 
  Alkali Metal Halogen
A lithium iodine
B lithium chlorine
C potassium iodine
D potassium chlorine

7. Sodium burns in chlorine producing sodium chloride. The correct balanced equation for this reaction is …

  • A. Na + Cl2   NaCl
  • B. 2Na + Cl2  2NaCl
  • C. Na + Cl   NaCl
  • D. Na + Cl2   NaCl2

8. The table below shows the melting point of some alkali metals.

Alkali Metal Atomic Number Melting Point (oC)
Sodium 11 98
Potassium 19 ?
Rubidium 37 39
Caesium 55 28
 

Predict the melting point of potassium using the data in the table.

  • A.  110 oC
  • B.  63 oC
  • C.  48 oC
  • D.  35 oC

9. The reactions of lithium and potassium with water are described below:

Alkali Metal Description of reaction with water
lithium Moves slowly, fizzes and disappears
potassium Moves quickly, fizzes and burns with a lilac flame
 

Which of the following best describes how caesium would react with water?

  • A.   moves very quickly, fizzes and explodes
  • B.   moves very quickly, fizzes and disappears
  • C.   moves quickly, fizzes and burns with a coloured flame
  • D.   moves very slowly, fizzes and disappears

10. Select the correct formula for the following potassium compounds:

  chloride oxide hydroxide
A KCl2 K2O K(OH)2
B KCl2 KO K2OH
C KCl KO KOH
D KCl K2O KOH

 

 

Jacques Barrette | Pixabay