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W/ practical
What Group is Chlorine in?
Group 7
What is Electrolysis?
Using electricity to split a compound
Why won’t some displacement reactions occur?
Because some of the elemnts have a higher reactivity than the other elements that’s trying to displace them
What is the proper name for a positive electrode?
Anode
What is the name of the thing that attracts to the anode
The anion
What is the proper name for a negative electrode?
Cathode
What is the name of the thing that attracts to the cathode?
The cation
What does pH stand for?
Power of Hydrogen
The pH of an acid or alkali is a measure of the concentration of…………ions
Hydrogen
A pH change from 4 to 2 increases H+ concentration by a factor of…..
100
The pH of a strong acid is……….. than the pH of a weaker acid if they have the same……….
Less, Concentration
What ions do acids produce in aqueous solutions?
H+
What ions do alkali produce in aqueos solutions?
OH-
Why is aliminuim oxide mixed with cryolite?
To lower its melting point
Why can aliminuim not be extracted by carbon?
Carbon is less reactive than aliminium
Strong acids are (completely/partially) ionised in an aqueous solution - Pick the right one
Completely
A weak acid is (completely/partially) ionised in an aqueous solution - Pick the right one
Partially
In sodium chloride solution, hydrogen forms at the cathode and chlorine forms at the anode. Why does Hydrogen form at the cathode and not Sodium?
Because sodium is more reactive than hydrogen
In sodium chloride solution, hydrogen forms at the cathode and chlorine forms at the anode. Why does chlorine form at the anode?
Because Chlorine is in Group 7
What are the tests for chlorine?
Litmus paper. And it turns from blue to white
What are the tests for hydrogen?
The squeakpy pop test.
The concentartion of an acid is…
a measure of the number of hydrogen ions in a solution
Describe how aliminuim is extracted by electrolysis:
Electrolysis splits these compunds. The oxygen goes through the process of oxidation (losing electrons) and attracts to the anode as it becomes a negative ion. Aliminium attracts to the cathode and goes through the process of reduction (gaining electrons)
What does OILRIG stand for?
Oxidation is Losing electrons, Reduction Is Gaining electrons
What is tITRARION
First step of titration practical:
1) Use pipette to transfer 25cm³ of sodium hydroxide solution and it will pour into the conical flask
What does the conical flatk do?
Reduces risk of splashing
Second step of titration practical:
2) Add 5 drops of indicator which will be to the alkali in the conical flask
Third step of titration practical:
3) Place conical flask on a white tile so seeing the colour change will be more visible
Fourth step of titration practical:
4) Fill burette w/ sulfuric acid
Fifth step of titration practical:
5) Add acid to the alkali until the solution is nuetral. Adjust just enough acid carefully for this to happen. Once slight colour change is seen, you now add acid drop by drop until solution is neutral.
What is it important to do with the conical flask?
We should swirl the solution to make sure the acid and alkali mix.
When neutralisation is showcased in the conical flask what colour will it turn into??
From a clear colour to pink
Sixth step of titration practical:
6) Read volume of acid added from the burrette that made the solution neutral. Take multiple measurements than find the mean for a total volume.
What do you do first before the actual/proper titration practical?
Do rough titration first.
Which one is more reactive, Sodium or Iron?
Sodium
List the reactivity series of elements
Potassium, sodium, calcium, magnesium, aluminium, zinc, iron, lead, copper , silver, gold
Metals can be arranged in a reactvitiy series based on their reactions w/ water and dilute……………. What one word completes the sentence?
Acids
What is the name of the main compound found in an iron ore?
Iron oxide or haemtite
Look at this list of metals: copper, sodium, iron, zinc, calcium. Which is the third most reactive?
Zinc
Which element is sused to reduce metal oxides and make pure metals?
Carbon
If copper is placed in a solution of zinc sulfate, will the zinc be displaced?
No
Explain your last answer:
Copper is less reactive than zinc. A metal that has a lower reactivity than another metal will never displace the original solution.
Will sodium displace iron from iron oxide?
Yes
Explain your last answer:
Because sodium is more reactive than an iron . So the sodium will replace iron in the compound.
Which of the following metals would react most vigorously with dilute hydrochloric acid? Copper, Calcium or Zinc
Calcium
Explain your answer:
Because calcium is more reactive than zinc and copper
Note 
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