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Chemistry µIB
3.2b Chemical Trends
10 quick questions

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10 minutes maximum!

An IB Periodic Table is required.

1. Which pair of elements will react most readily?
  • A.   lithium + iodine
  • B.   lithium + chlorine
  • C.   potassium + iodine
  • D.   potassium + chlorine

2. Which of the following reactions will occur as written?

I.    Br2 (aq) +  2KCl (aq)Cl2 (aq)   +   2KBr (aq)
II.   I2 (aq)   +  2KBr (aq)Br2 (aq)   +   2KI (aq)
III.  Cl2 (aq)   +   2KI (aq)I2 (aq)   +   2KCl (aq)
 
  • A.   I only
  • B.   III only
  • C.   I and II only
  • D.   II and III only
3. Caesium is an element in group 1 of the Periodic Table. Which statement is true for caesium?
  • A.   It has a low melting point and a slow reaction with water
  • B.   It has a high melting point and a slow reaction with water
  • C.   It has a low melting point and a vigorous reaction with water
  • D.   It has a high melting point and a vigorous reaction with water

4. Which of the following would be observed when lithium is added to water?

I. A flame
II. Effervescence
III. The temperature of the solution rises
 
  • A.   I and II only
  • B.   I and III only
  • C.   II and III only
  • D.   I, II and III
5. Which equation correctly represents the reaction of sodium with water?
  • A.  2Na(s) +  2H2O(l)  →  2NaOH(aq) + H2(g)
  • B.  2Na(s) +  2H2O(aq)  →  2NaOH(s)  + H2(g)
  • C.  2Na(s) +  H2O(l)  →  Na2O(aq)  + H2(g)
  • D.  2Na(s) +  H2O(aq)  →   Na2O(s)  + H2(g)

6. Which statements apply to aluminium oxide?

I. It dissolves in water to produce a neutral solution
II. It reacts with strong acids
III. It reacts with strong alkalis
 
  • A.   I and II only
  • B.   I and III only
  • C.   II and III only
  • D.   I, II and III
7. What is the approximate pH of the solution produced when potassium is added to water?
  • A.   2
  • B.   7
  • C.   9
  • D.   13
8. Why is potassium more reactive that sodium?
  • A.   Potassium has a lower ionization energy than sodium
  • B.   Potassium has a greater value of electron affinity than sodium
  • C.   Potassium has a greater nuclear charge than sodium
  • D.   Potassium has a lower melting point than sodium

9. Which row gives the correct acid-base classification for the oxides of period 3 from Na to Cl?

  Acidic Amphoteric Basic
A Na, Mg Al Si, S, P, Cl
B Na, Mg, Al Si P, S, Cl
C Si, S, P, Cl Al Na, Mg
D P, S, Cl Si Na, Mg, Al

10. Which row correctly states and gives a reason for the trend in reactivity from fluorine to iodine?

  Reactivity Because..
A decreases the electron affinity decreases down the group
B decreases the ionization energy decreases down the group
C increases the electron affinity decreases down the group
D increases The ionization energy decreases down the group