Edit Game
Y11 chemistry CC10/11 Electrolysis Equilibrium
 Delete

Use commas to add multiple tags

 Private  Unlisted  Public



 Save


Get beautiful free images


Delimiter between question and answer:

Tips:

  • No column headers.
  • Each line maps to a question.
  • If the delimiter is used in a question, the question should be surrounded by double quotes: "My, question","My, answer"
  • The first answer in the multiple choice question must be the correct answer.

 Import questions


Get beautiful free images






 Save   61  Close
What is the source of hydrogen in the Haber process?
natural gas or water or steam
What is the source of nitrogen in the Haber process?
air
What happens to an equlibrium of gases when you decrease gas pressure
 
direction that forms more gas molecules (increases pressure)
 
direction that forms less gas molecules (decreases pressure)
 
in direction that uses up the substance that has been added
 
direction that forms more of the substance removed
In the following reaction: 2H2O(g) <--> 2H2(g) + O2(g) If you increase the pressure, what will happen?
The equilibrium will shift to reactants (left) because there are fewer gas molecules on the left.
When a compound is oxidised, what happens in terms of oxygen?
oxygen is gained
This happes when a metal reacts with oxygen, making the metal weaker over time
corrosion
Zinc oxide reacts with carbon to form zinc and carbon dioxide in a redox reaction. Explain which substance has been oxidised and which has been reduced.
oxidised: carbon (gained O/lost e-); reduced: zinc oxide (lost O/ gained e-)
What is the last state in the life cycle assessment of a product
 
disposing of the product
 
obtaining and processing raw materials
 
using the product
 
manufacture and packaging of product
What is the balanced Haber equilibrium equation? (include states of matter also)
N2(g) + 3H2(g) <--> 2 NH3(g)
What catalyst was used in the Haber process to produce ammonia from nitrogen and hydrogen?
 
iron
 
iodine
 
enzymes
 
sunlight
Which of the following is TRUE about this process? N2(g) + 3H2(g) <--> 2NH3(g)
 
This is the Haber process
 
When nitrogen is added more hydrogen is produced
 
This is not an equilibrium reaction
 
When ammonia is added, more nitrogen is produced
When calcium carbonate is heated it decomposes to form calcium oxide and carbon dioxide. Which of the following is NOT true about this reaction?
 
The equilibrium can be shifted if calcium oxide is removed
 
equilibrium cannot be achieved as this is an open system.
 
Equation: CaCO3(s) <--> CO2(g) + CaO(s)
 
carbon dioxide gas is released
How does equilibrium shift if heat is added to this reaction? (justify your answer)
shift to reactants (left) because it is exothermic the heat is a product and adding more stress to products shifts to reactants
How does equilibrium shift if nitrogen dioxide is removed from this reaction? (justify your answer)
shift to reactants (left) to compensate for the lack of stress on reactants
How does equilibrium shift if nitrogen dioxide is added to this reaction? (justify your answer)
shift to products (right) to compensate for the stress on reactants
What happens at the highlighted point?
equilibrium (when it levels off)
What happens to the amount of products when a reaction reaches equilibrium?
it stays the same
What is: a state of balance between continuing processes.
dynamic equilibrium
What is: a state of balance between continuing processes.
dynamic equilibrium
Taking waste metal and changing it into a useful item. What process is this?
recycling metal
What is the half reaction that occurs at the anode for Al2O3
2O2- --> O2 + 4e-
What is the half reaction that occurs at the cathode for Al2O3
Al3+ + 3e- --> Al(s)
Which metal can only be extracted from its ore by electrolysis
 
sodium
 
gold
 
lead
 
zinc
Plants absorb mineral ions through their roots. What is this?
phytoextraction or phytomining
Why is bioleaching slow?
the bacteria take time to decompose the ore
What is bioleaching?
 
extract metals in ores using microorganisms to oxidize metal
 
using enzymes to do metal plating
 
use bacteria to convert copper into gold
 
use bacteria to shine metals
State why copper can be produced by heating copper oxide with carbon
carbon is more reactive than copper, and will displace copper from copper oxide
a naturally occurring solid material from which a metal or valuable mineral can be extracted profitably. What is this?
ore
State the order of reactivity of the three metals, giving a reason for your answer.
increasing reactivity: Z, X, Y - X displaces Z so X is more reactive than Z; X does not display Y so Y is more reactive than X
Predict products: copper + magnesium sulfate -->
no reaction (because copper is lower on reactivity series and not reactive)
Predict products: magnesium + copper sulfate -->
copper + magnesium sulfate
What are the products: Mg(s) + H2O(aq) -->
H2(g) + MgO(s)
What are the products: Zn(s) + H2SO4(aq) -->
H2(g) + ZnSO4(aq)
When a sodium chloride solution is electrolysed, why is hydrogen produced instead of sodium metal?
hydrogen ions are discharged more readily than sodium ions
What is the ratio of hydrogen: oxygen gas volume when acidified water is oxidized
2:! hydroge: oxygen because the formula for H2O is 2 hydrogen for every 1 oxygen
Which half reaction of molten lead shows oxidation?
the anode
What would be the product at the cathode from the electrolysis of molten sodium chloride?
sodium
What would be the product at the anode from the electrolysis of molten sodium chloride?
anode: chlorine
In the copper sulfate practical, why did we use propanone to wipe the electrodes before they were weighed?
to dry them, so that the weight represents only the copper and not the water.
In the copper sulfate electrolysis practical, why was a variable resistor required?
the current can vary in the experiment but a variable resistor keeps it constant
In the copper sulfate electrolysis practical, why did you have to clean the copper electrodes?
so that the copper deposited will adhere to the electrode ( because when it is oxidized, the copper metal is not on the outside)
In the copper sulfate electrolysis practical, what was the gas that was produced?
 
oxygen
 
carbon dioxide
 
hydrogen
 
nitrogen
Which of the following does not describe oxidation?
 
gain of electrons
 
loss of electrons
 
gain of oxygen
 
loss of hydrogen ions
Which ions would be attracted to an anode: Ca2+, SO3, NO3-, Br-, Fe3+, NO2,
NO3- and Br-
Identify the Cations: Ca2+, SO3, NO3-, Br-, Fe3+, NO2,
Ca2+ and Fe3+
What type of ion is F-?
anion
What type of ion is Fe2+
cation
Explain why ionic solids cannot be electrolysed
ions cannot move around in a solid (when electrolysis occurs ions need to move to electrodes)
electrolysis can only occur in
 
solutions or liquids
 
solids
 
gases
 
any of the other choices
Define electrode
 
rod of metal/graphite which carries current in/out solution
 
a negatively charged particle
 
chemical decomposition produced by passing electric current
 
a positively charged metal
Name the electrode that diminishes during electroplating.
Anode
What is electroplating?
Electroplating is the electrolytic process of deposition of a superior metal on the surface of a baser metal or article.
Why are articles electroplated? [two reasons]
To prevent corrosion and to make them attractive
Mention any two conditions for electroplating [with reasons]
To be discussed
Why is pure water a non-electrolyte?
Because contains only molecules and not ions to conduct electricity
Metals which ionize most readily are at the ________ of the series. [top / bottom]
top
State the entire electro-chemical series of metals in proper order.
K, Ca, Na, Mg, Al, Zn, Fe, Pb, [H], Cu, Hg, Ag
Explain how OH- ion yields oxygen gas at the anode.
4 OH- ons lose an electron each and give 2 molecules of water and one molecule of oxygen
What is meant by the degree of dissociation?
It is the extent to which an electrolyte breaks up into ions
State the charge of the electrode where oxidation takes place.
Positive
Which is the negative electrode? Which ions migrate to it?
Cathode, Cation


Get beautiful free images

Your experience on this site will be improved by allowing cookies.