1.
NaCl(s) cell anode cathode 3.
2.
4.
Modelling electrolysis
Our Goal today: We are going to create a model to understand the electrolysis of NaCl(l) What is a model and why do we use it in science? Compare to reality What is an ion? Model A1 atom or ion?
charge? Model A2 atom or ion?
charge? Model B1
atom or ion? charge?
Model B2 atom or ion? charge?
Paired discussion Each model shows the same element. Q1. Can you identify what the element is? Explain how you know this. Q2. Which models are of atoms? What is the charge. Explain how you know this. Q3. Which models are of ions and what is the charge? Explain how you know this. Q4. Can you now explain in your own words what an ion is. Key words: protons, electrons, positive, negative, atom An ion is...... A. D. atom or ion? charge? B. atom or ion? charge? C. atom or ion? charge? atom or ion? charge? Electrolysis turns ions into atoms (or molecules) Cl2
?
How does it work? NaCl
Na
Sodium chloride ions • Use the sheet to help you
• Tick off each point as you do it
• If you get stuck I can help If you are finished, get your partner to use the criteria above to ask you questions. You must use the model to explain you answers. Swap. Evaluate one model together Back to evaluate and improve Sodium chloride ions Electrolysis turns ions into atoms (or molecules) . Q1. What is the difference between an atom and an ion? An atom is different to an ion because....
Q2. Can you describe the movement of electrons in electrolysis? Electrons move from..... to........
Q3. What did your model teach you about electrolysis that you did not understand before?
Before I thought....
But now I know..... If you are stuck use this sheet to help you. Draw on the electrons for the sodium and the chloride ion. You can now use these in your model
+
Na
+
Na
Cl­
Cl­