Metallic bonds

Question 1

What is meant by the term metallic bond?

Answer 1

Metallic bond is the electrostatic attraction between positive ions and delocalised electrons

Question 2

Explain fully the properties of metallic bonds

Answer 2

Metallic compounds can always conduct electricity, they usually have high melting points

Question 3

Explain fully why metallic compounds can conduct electricity

Answer 3

Metallic compounds have delocalised electrons which are free to move through out the compound

Question 4

Write the full word equation for the reaction of a metal with oxygen

Answer 4

Metal + oxygen = metal oxide

Question 5

Write the full word equation for the reaction of a metal with water

Answer 5

Metal +water =metal hydroxide +hydrogen

Question 6

Write the full word equation for the reaction of a metal with acid

Answer 6

Metal +acid = salt + hydrogen

Question 7

State what is meant by the term redox reaction

Answer 7

Redox reaction is one in which oxidation and reduction take place at the same time

Question 8

What is meant by the term oxidation reaction

Answer 8

Oxidation involves the loss of electrons

Question 9

What is meant by the term reduction reaction

Answer 9

Reduction involves the gain of electrons

Question 10

Write the equation for the reduction of sodium

Answer 10

Na+ plus e- ~> Na(s)

Question 11

Write the equation for the oxidation of aluminium

Answer 11

Al (s) ~> Al3+.(aq) plus 3e-

Question 12

MnO4- plus 8H+ plus 5e- ~> Mn2+ plus 4H2O

H2O ~>. O2 plus. 2H+ plus 2e-

Answer 12

2MnO4- plus 6H+ plus 5H2O2 ~> 2Mn2+ plus 8H2O plus 5O2

Question 13

Cl2 plus 3e- ~>. 2Cl-

Fe2+ ~> Fe3+ plus e -

Answer 13

Cl2 plus 2Fe2+. ~>. 2Cl- plus 2Fe3+

Question 14

What is the reaction that occurs during the extraction of a metal

Answer 14

Metal ions are reduced to metal atoms

Question 15

State what is meant by the term ore

Answer 15

An ore is a naturally occurring rock that contains a metal or metal compound

Question 16

List the metals that can be extracted using heat alone

Answer 16

Ag silver
Au gold
Hg mercury

Question 17

List the metals that can be extracted using heat with carbon or carbon dioxide

Answer 17

Cu. Copper
Pb. Lead
Sn. Tin
Fe. Iron
Zn. Zinc

Question 18

Which metals can be extracted using electrolysis

Answer 18

Any metal above Al (aluminium) on the electrochemical series

Question 19

What is meant by the term electrolysis

Answer 19

Electrolysis is a method of extracting metals at the top of the electrochemical series. Electrolysis extracts the metals using electricity

Question 20

Explain fully why a D.C. power supply needs to be used during electrolysis

Answer 20

DC means direct current and is used to ensure each electrode has a permanent charge which means the products can be identified

Question 21

What is meant by the term electrolyte

Answer 21

Electrolyte is a solution that contains ion so is able to conduct electricity

Question 22

Draw a simple cell

Question 23

Draw a cell made of two- half cells

Question 24

State the use of an ion bridge

Answer 24

An ion bridge in a cell completes the circuit by linking to half cells

Question 25

Explain fully how the voltage produced in an electro chemical cell can be predicted

Answer 25

The further apart, the metals are in the electrochemical series, the higher, the voltage produced will be

Question 26

Explain fully how the voltage produced in an electrochemical cell can be predicted

Answer 26

The further apart metals are in the electrochemical series, the higher, the voltage produced will be

Question 27

Identify the oxidation and reduction reactions taking place in an electrochemical cell

Answer 27

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