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Electrolysis

Authored by Andrew Hogan

Chemistry

10th - 12th Grade

NGSS covered

Used 182+ times

Electrolysis
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20 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is electrolysis?

breaking down of a compound using a current
making a compound using a current

Tags

NGSS.HS-PS2-5

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which statement correctly describes the 2 electrodes?

The anode is negative and the cathode is positive
The anode and cathode are both positive
The anode is positive and the cathode is negative
The anode and cathode are both negative.

Tags

NGSS.HS-PS3-5

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Positive ions (cations) will move towards the cathode (-) where they will discharge by....

Breaking apart
Losing electrons
Clumping together.
Gaining electrons

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the equation to show what happens to Cl ions at the anode.

Cl- --> Cl + e-   
2Cl- --> Cl2 + 2e-   
Cl2 + 2e-   2Cl- 
Cl2 + 2e-  -->  2Cl- 

5.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Choose the half-equation that shows the discharge of aluminium ion.

Al3+ - 3e- --> Al

Al2+ + 3e- --> Al

Al3+ + 3e- --> Al

Al3+ --> Al + 3e-

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the half-equation for the discharge of hydroxide ions?

2O2- --> O2 + 4e-

OH- --> OH + e

4OH- --> 2H2O + O2 + 4e-

2H2O + O2 + 4e- --> 4OH-

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the product formed at the cathode during the electrolysis of molten magnesium fluoride (hint: consider the oxidation states of the products)?

magnesium
hydrogen
fluorine
oxygen

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