Extracting copper Flashcards

1
Q

Copper-rich ore

A

From where we extract most of the copper. These are limited source and are in danger of running out.

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2
Q

Two main methods to obtain copper from the ore

A
  • use sulfuric acid to produce copper sulfate solution, before extracting the copper metal
  • smelting-heat copper ore very strongly with air to produce copper metal
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3
Q

Copper mining has a negative impact on…

A

the environment.

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4
Q

A cathode electrode is made of…

A

pure copper.

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5
Q

The half-equation at the cathode

A

Cu2+(aq)+ 2e- = Cu(s)

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6
Q

The half-equation at the anode

A

Cu(s)= Cu2+(aq) + 2e-

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7
Q

Thermal decomposition (smelting) is used to extract copper from…

A

melted chalcocite. Equation:

copper (l) sulfide + oxygen = copper + sulfur dioxide

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8
Q

Sulfur dioxide causes

A

acid rains. Therefore, it is neutralised in chimneys or used to make sulfuric acid.

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9
Q

Electrolysis is used to…

A

make pure copper.

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10
Q

Smelting produces very…

A

impure copper.

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11
Q

An anode electrode is made of…

A

impure copper.

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12
Q

In this process of electrolysis…

A

atoms from impure electrode move through the solution, containing copper ions, to the pure electrode.

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13
Q

The anode gets…

A

smaller as atoms move to the cathode.

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14
Q

Copper from copper sulfate can be extracted by…(displacement)

A

adding scrap iron. Iron is more reactive than copper, so it can displace copper from its solution. (Displacement)

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15
Q

Phytomining

A

Uses plants to absorb metal compounds and then the plants are burned to produce ash, containing the metal compound.

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16
Q

Low-grade ore

A

Heps of previously discarded waste from processing of copper-rich ores.

17
Q

The ash containing copper is…

A

dissolved in sulfuric acid and this makes the copper ions leach, producing leachate solution.

18
Q

Copper can be extracted from copper sulfate by…

A

electrolysis or adding a scrap metal(displacement)

19
Q

Bioleaching

A

Bacteria feed on low-grade metal ores. These bacteria are then used to produce leachate solutions that contain metal compounds.

20
Q

Recycling of metals

A

It is important to recycle metals because extracting them uses limited sources, expensive in terms of energy and it is harmful to the environment.