KEY ANSWER - QUIZ: CHEMICAL REACTION, REDOX, ELECTROLYSIS
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1. Oxidation is the loss of_______________or the_________________of oxygen
2. Reduction is the loss of________or the ______________of electron
3. Limestone, Calcium carbonate is heated at high temperature. CaCO3 --> CaO + CO2
4. H2 + O2 --> H2O
5. Which one of the following changes is a reduction?
6. The reaction between magnesium and dilute hydrochloric acid may be represented by the equation: Mg + 2H+ --> Mg2+ + H2
7. At cathode occurs....
8. Is the positive electrode
9. Which of the following is an electrolyte?
10. During the electrolysis of a MOLTEN salt (compound) the product at the CATHODE is:
11. During the electrolysis of a MOLTEN salt (compound) the product at the ANODE is:
12. During the electrolysis of a MOLTEN sodium chloride ( NaCl ) the product at the anode and the cathode are:
13. During the electrolysis of a MOLTEN lead iodide ( PbI2) the product at the anode and the cathode are:
14. During the electrolysis of a CONCENTRATED CuSO4( aq) the product at CATHODE is
15. When aqueous H2SO4(aq) solution is electrolysed using inert carbon electrodes, the substance formed at cathode is:
16. Which of the following does NOT contain free ions?
17. Metallic and non-metallic elements can both be extracted by electrolysis. Which element is produced at the negative electrode (cathode)?
18. The diagram shows the electrolysis of molten lead(II) bromide.
19. Copper and hydrogen can each be formed by electrolysis. At which electrodes are these elements formed?
20. Two elements X and Y form ionic compounds, XBr2 and Y2O3. The compounds are separately melted and electricity is passed through the liquids.
In electrolysis of aqueous copper(ii) sulfate solution using graphite electrodes.
The following diagram shows electroplating of a an iron spoon with copper
The diagram shows the electrolysis of Lead (II) bromide, PbBr2
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6. The reaction between magnesium and dilute hydrochloric acid may be represented by the equation: Mg + 2H+ --> Mg2+ + H2
A metallic cup can be coated in silver by electrolysis. The process is called electroplating
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27/08/2018 7:37:53D. electron; gainC. oxygen; gainC. DecompositionC. synthesisD. KMnO4 --> MnO2
B. oxidation because there has been a loss of electrons
B. reductionC. anodeD. hydrogen chlorideB. metalA. non metal
D. anode:chlorine; cathode:sodium
B. anode:iodine; cathode:lead
D. Red brown deposit Cu(s)
A. hydrogen gas
C. Solid potassium nitrate
D. hydrogen
A. electrode X:brown gas; electrode Y:silvery metal
D. copper:cathode; hydrogen:cathode
D. X and Y
Cu(2+), SO4(2-), H(+) , OH(-)
anode: bubbles
cathode: brown solid deposited
anode: oxygen
cathode: Cu
4OH- --> O2 + 2 H2O + 4e
Cu(2+) + 2e --> Cucopperanodecathode
copper sulfate
copper nitrate
silver
because its ions do not move freely
2Br- --> Br2 + 2ebrominePb(2+) + 2e --> Pb
it will not be coated evenly
in order to coat the spoon evenly
silver sulfate
silver nitrate
markus.heriprasetyo@kalamkudussolo.sch.id
B. oxidation because there has been a loss of electrons
silver
silver nitrate
silver cyanide
silver sulfate
cathode
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