Unit 3 Test Review - Mining Metals Flashcards
Is metal ore/rock pure?
No, they are not entirely pure. Metals oxidize. They react with oxygen over time, forming oxides. They form ionic substances.
What is electrolysis? When do people use electrolysis?
It is a process by which electric current is passed through a substance to effect a chemical change. People use it if the element is higher than C on the reactivity series.
What do people do with an ionic compound to make an electrolyte?
They make sure the ionic compound is heated until molten and dissolved in water.
In which forms do ionic substances form electricity in?
Molten form and Aqueous form
How does electrolysis actually work?
Once the source of electricity is on, the negative electrode attracts more positive ions, consequently extracting all the metal ions out of the electrolyte
At the negative electrode an ion like Fe3+ can be stripped of this charge ad turned into an iron atom. Write a half equation to show how this happens.
3e- + Fe3+ —-> Fe0
What is smelting? Is it a chemical reaction?
Smelting is the name of the industrial process of
using a blast furnace (heating/melting) to extract metal from ores. It is NOT a chemical reaction, it is the name of an industrial process.
What is the reaction happening during smelting?
The reaction that’s actually happening in the furnace is a redox reaction
What is a redox reaction?
A redox reaction is a specific example of a single displacement reaction where there is an oxidation reduction. It is an oxidation-reduction reaction. The non metal is oxidized and the metal is reduced.
In a redox reaction, why is carbon oxidized and why is iron (III) oxide reduced?
Carbon is oxidized because oxygen is added to it
Iron(III)oxide is reduced because oxygen is removed from it.
What are the three stages of obtaining metal compounds from ores? Explain each.
1) Mined - dug from the ground
2) Crushed - separate metallic compound from waste rock
3) Processed - separate metallic compounds from substances
During smelting, to a furnace you…
1) Add coke
2) Add mineral
3) Add air supply
4) Ignite
a) Predict the result of this reaction:
C + Fe2O3 —->
b) What type of reaction is this?
c )Why does this reaction form this product, what is happening?
a) C + Fe2O3 —> Fe + CO2
b) This type of reaction is redox
c) - This reaction happens because oxygen is removed from
iron(III) oxide and added to carbon (forming CO2).
- This is a single displacement oxidation-reduction reaction where the metal oxide loses the oxide
What temperature does smelting require?
Smelting requires a temperature of 1500 degrees Celsius
What is the difference between molten and aqueous form?
The key difference between molten and aqueous is that:
- The term molten refers to the liquid state of
materials that are liquified by heat - The term aqueous refers to the liquid state of
materials that are liquified by dissolving in
water.
