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When you started the exam and told the presiding officer you were sick, they would've kept an eye on you throughout the exam to see if you had any visible signs of being affected during the test. If they noticed any difficulties there's a section for them to fill out to corroborate your form...

One person left our exam early out of like 90+. I'm from a selective high school so its weird for us to even have one person leave early.

Good work. Our teacher went through with us during the year stuff about how a galvanic cell can work work in one beaker, and an electrolytic cell can work in two beakers as long as the set-up is right. So I'm 100% confident on this answer

Just James is right, the iron doesnt rust because the magnesium is more reactive than it. The magnesium works like a sacrificial anode, making the nail a cathode. The electrons move through the electrolyte, as do the ions. The iron deposits on the nail and the magnesium corrodes until either all...