IGCSE CHEMISTRY 2013 (May 20th & June 10th)

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I think it was magnesium and I can't remember the other one (but it was more reactive than hydrogen in the reactivity series)

Yeah Magnesium and Iron. That's what I put but some said it was Copper since Magnesium has a rapid reaction with the acid so it is not a safe reaction. :/

Reply 161

alexgr97

Original post by Vorte

What did you guys put for that question where they ask to choose two metals that can be used for a safe reaction?

I put Magnesium and Iron.

It said to react safely, which means it can't be Potassium. Copper doesn't react either. So it's definitely two out of Magnesium, Iron and Silver.

Reply 162

Vorte

Original post by expatkid

Thanks

I put negative too but I was a but confused about the question hahah

And also, sometime said they think the A* boundary would be 160, but I doubt it will be that high. Remember there are thousands of other people around the world taking the test and for what some people find easier than the other paper, some may find it hard. I think it will still be around 75-78% as grade boundaries don't change that much year to year. :smile:

Yeah I Just said there are chances of it being really high. I just hope it stays in the normal range.

Reply 163

username1194059

Wasn't the energy question just 2310J???

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Reply 164

alexgr97

Original post by ooftar

Wasn't the energy question just 2310J???

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Yeah something like that.

Reply 165

LookIts_Liam

Original post by Vorte

Yeah Magnesium and Iron. That's what I put but some said it was Copper since Magnesium has a rapid reaction with the acid so it is not a safe reaction. :/

no, for preparation of soluble salts they use MAZIT metals ie magnesium aluminium zinc iron tin, so you're right :smile:

Reply 166

NikolaT

Original post by LookIts_Liam

no, for preparation of soluble salts they use MAZIT metals ie magnesium aluminium zinc iron tin, so you're right :smile:

Oh, poop.

Reply 167

joey12340

what did people write for the names of the two apparatus (in the titration)

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Reply 168

Enigma Machine

I'm pretty sure it's copper and iron. I believe Mg reacts too violently.

Original post by joey12340

what did people write for the names of the two apparatus (in the titration)

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Beaker and pipette

Reply 169

mm97123

Why was the experiment not complete in the graph question and what do you think we had to say for five marks for the nitrogen and silicon question?

Reply 170

Enigma Machine

Original post by mm97123

Why was the experiment not complete in the graph question and what do you think we had to say for five marks for the nitrogen and silicon question?

The line is not straight at any point.

For the 5 marker:

Nitrogen is a simple molecular structure, with weak intermolecular forces between them. Nitrogen's melting and boiling points are low because of this.

Silicon is a giant covalent structure. It has lots of strong covalent bonds and so a lot of energy is required to break these bonds apart, meaning it has a high melting and boiling point. This means it is a solid at room temperature.

Reply 171

joey12340

also for the graph people, what did others get for the anmoloy? i thpught it was the firsy point as if the fordt point was included the straoght line would bot go through the origin

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Reply 172

joey12340

*first
*straight
*not

sorry for the bad spelling

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Reply 173

Enigma Machine

Original post by joey12340

When they ask you to draw a line of best fit, it doesn't necessarily have to go through the origin. It was the first point.

Reply 174

Fatima-A

Guys, you know when they asked for the common name of one of the compounds, what did you get?

Reply 175

joey12340

yes i know, for me it wad just a good way to ensure it was the first point as at 0% hydrochloric acid the rate of reaction would be 0, so the line would go through the origin

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