Properties of Period 3 Elements and their Oxides Flashcards Preview

AQA A level Chemistry HJ > Properties of Period 3 Elements and their Oxides > Flashcards

Flashcards in Properties of Period 3 Elements and their Oxides Deck (26)
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1
Q

Na or Mg, which is more reactive?

A

Na (G1) is more reactive than Mg (G2).

2
Q

what do Na and Mg form when they lose electrons?

A

Na+ and Mg+

3
Q

why is Na more reactive than Mg?

A

Sodium is more reactive than Magnesium as the amount of energy required to remove an electron from Sodium is lower than it is to remove 2 with Magnesium.

More energy is required for Magnesium to react

4
Q

what happens to Sodium as it reacts with cold water?

A

yellow flame
sodium melts
universal indicator (goes from green -purple)
effervocense the gas produced is H2
alkaline solution of Sodium hydroxide

5
Q

what is the test for hydorgen?

A

the test for H2 is the squeaky pop test

6
Q

write the equation for when Na reacts with cold water?

A

2Na (s) + 2H2O (l) –> 2NaOH (aq) + H2 (g)

7
Q

what happens to Magnesium as it reacts with cold water?

A

Magnesium reacts slowly with cold water forming a weak alkaline solution of magnesium hydroxide (Mg(OH)2).
-this is a weak alkaline solution as magnesium hydroxide is sparingly soluble so there are little OH- ions in solution.

8
Q

write the equation for the reaction between Mg and cold water?

A

Mg (s) + 2H2O (l) –> Mg(OH)2 (aq) + H2 (g)

9
Q

describe the reaction between Mg and steam?

A

Magnesium reacts much faster with steam forming a magnesium oxide (MgO)

10
Q

write the equation for the reaction between Mg and steam?

A

Mg (s) + H2O (g) –> MgO (s) + H2 (g)

11
Q

what happens to P3 elements when they react with oxygen?

A

they form oxides

12
Q

what is the exception for the element in P3 that doesn’t form an oxide?

A

Sulfur

13
Q

what does Sulfur form when it reacts with oxygen?

A

it forms SO2 (oxidation number +4) . With a higher temperature and catalyst SO3 can be made (oxidation number +6)

14
Q

write an equation for the reaction between sodium and oxygen

A

2na (s) + 1/2 O2 (g) –> 2Na2O (s)
sodium oxide

15
Q

write an equation for the reaction between magnesium and oxygen

A

Mg (s) + 0.5 O2 (g) –> MgO (s)
magnesium oxide

16
Q

write an equation for the reaction between aluminium and oxygen

A

2Al (s) + 1.5 O2 (g) –> Al2O3 (s)
aluminium oxide

17
Q

write an equation for the reaction between silicon and oxygen

A

Si (s) + O2 (g) –> SiO2 (s)
silicon dioxide

18
Q

write an equation for the reaction between phosphorus and oxygen

A

P4 (s) + 5O2 (g) –> P4O10 (s)
phosphorus (V) oxide

19
Q

write an equation for the reaction between sulfur and oxygen?

A

S (s) + O2 (g) –> SO2 (g)
sulfur dioxide

20
Q

how does Na2O react with air?

A

very fast

21
Q

how does MgO react with air?

A

very fast

22
Q

how does Al2O3 react with air?

A

slow (fats if powered because of the large SA)

23
Q

how does SiO2 react with air?

A

slow

24
Q

how does P4O10 react with air?

A

spontaneously combusts

25
Q

how does SO2 react with air?

A

steadily burns

26
Q

why do Na2O, MgO and Al2O3 all have high melting points?

A

they form giant ionic