AQA Chemistry Unit 2 & 3 Question Game 14th June 2016

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xxxtentacion..
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This is the official thread for the Unit 2 & 3 question game for chemistry. Answer the question from the post above and ask another question for the next person to answer.

I'll start: --->Describe how the structure of an alloy is different from the structure of a pure metal (2 marks) <---
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Wikia
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- Layers in alloys do not slide over eachother as the atoms are different sizes (whereas in a pure metal they do), and as a result they cannot be bent into shape.

--> What is meant by an endothermic reaction (1 mark)
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Anmol_.
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Endothermic reaction is one which absorbs energy from the surroundings in the form of heat and is seen by a fall in temperature.

Explain the process of electroplating (3 marks)
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nerdyminion
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(Original post by Anmol_.)
Endothermic reaction is one which absorbs energy from the surroundings in the form of heat and is seen by a fall in temperature.

Explain the process of electroplating (3 marks)
The object which is going to be electroplated is the cathode; the material that the object is going to be plated with is the anode. At the anode, the material is oxidised, meaning that it loses electrons and positively charged ions enter the solution (electrolyte). At the cathode, the positively charged ions are reduced, meaning they gain electrons and become atoms of the material.

C3: Describe the Haber process and its conditions.
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Mahrez
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(Original post by nerdyminion)
The object which is going to be electroplated is the cathode; the material that the object is going to be plated with is the anode. At the anode, the material is oxidised, meaning that it loses electrons and positively charged ions enter the solution (electrolyte). At the cathode, the positively charged ions are reduced, meaning they gain electrons and become atoms of the material.

C3: Describe the Haber process and its conditions.
Temp of 450 and pressure of 200. High temp increases rate of reaction but low temp favours exo thermic side of the reaction. Increased pressure increases rate and yield but expenisve. so a comprimise is used. Sorry for dogy typing cba to explain fully
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alchima
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(Original post by nerdyminion)
The object which is going to be electroplated is the cathode; the material that the object is going to be plated with is the anode. At the anode, the material is oxidised, meaning that it loses electrons and positively charged ions enter the solution (electrolyte). At the cathode, the positively charged ions are reduced, meaning they gain electrons and become atoms of the material.

C3: Describe the Haber process and its conditions.
The Haber process is the production of ammonia from nitrogen and hydrogen. The reaction is reversible and takes place in a chamber where the gases are compressed to 200atm and the temperature is 450 degrees. The unreacted nitrogen and hydrogen and ammonia will leave the chamber and is cooled. Ammonia liquefies and is tapped off and the remaining gases are recycled to make more ammonia.
Question: Give one similarity and one difference between alkali metals and halogens.
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xxxtentacion..
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(Original post by alchima)
The Haber process is the production of ammonia from nitrogen and hydrogen. The reaction is reversible and takes place in a chamber where the gases are compressed to 200atm and the temperature is 450 degrees. The unreacted nitrogen and hydrogen and ammonia will leave the chamber and is cooled. Ammonia liquefies and is tapped off and the remaining gases are recycled to make more ammonia.
Question: Give one similarity and one difference between alkali metals and halogens.
Theyre both highly reactive. However, alkali metals need to lose one electron and halogens need to gain one electron.

---> How does temperature have an effect of equilibrium? <-----
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jazz_xox_
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(Original post by hafsa473)
Theyre both highly reactive. However, alkali metals need to lose one electron and halogens need to gain one electron.

---> How does temperature have an effect of equilibrium? <-----
A higher temperature would favour the reaction in the endothermic way to supply the heat energy needed, but in the Haber Process, more heat is compensated to increase the rate of reaction

explain the method of titration calculations
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bborn12
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does anyone know the time of the unit 2 exam tomorrow ? my schools messed up the time
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syeds
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(Original post by bborn12)
does anyone know the time of the unit 2 exam tomorrow ? my schools messed up the time
mine is 1:25
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bborn12
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(Original post by syeds)
mine is 1:25
Thank you so much
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jazz_xox_
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(Original post by bborn12)
does anyone know the time of the unit 2 exam tomorrow ? my schools messed up the time
Mine is 1pm- its definitely an afternoon exam depending when your school do them
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Hassan M
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Name the products of sodium chloride solution in electrolysis?
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pratical1
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A hydrogen gas
A chlorine gas
A solution of sodium hydroxide is formed.

What are the characteristics of a simple molecule structure (covalent bonding) - 3marks
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syeds
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Good luck everyone!
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Monsor
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Chemistry is easy just acids and salts which mess my head , good luck guys

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DatSmartGuy
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Its 2:43am and I'm still revising. :smug: Dedication or stupidity??!?!

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syeds
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EASIEST EXAM! what did everyone get for the mean temp?
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Hassan M
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I got 6.04


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GCSElyfe
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(Original post by syeds)
EASIEST EXAM! what did everyone get for the mean temp?
I got 5.75


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