we are all in the gutter, but some of us are looking at the stars

Monday, 12 November 2007

Wow.. Aha! I shall write YOU a quiz!!!! Kiii-YA!

And here was me thinking that no-one ever went on this blog.
Write another quiz! hehe.
I'll write a quiz. On carbon chemistry :O
1. What is ethanol used for?
2. What is a hydrocarbon?
3. What is the difference between an alkane and an alkene?
4. When carbon dioxide is dissolved in water (eg. in coke), what is the product? (Ie. what does it make?)
5. What does combust mean?
6. When something combusts in air, what is it actually reacting with?
7. Is diamond a conductor? Why/why not?
8. Is graphite a conductor? Why/why not?
9. What is an allotrope?
10. How are the gases NO and NO2 formed, and what are their effects on the environment/humans?


Jess said...

1. Oiling bananas.
2. A compound consisting of hydrogen and carbon (and maybe other stuff too).
3. One has an a and one has an e.
4. A European swallow.
5. EXPLODE! Or burn.
6. That would depend.
7. No. Because it's too dense.
8. No. Um.
9. Not a European swallow.

Bridget said...

1. (x) Ethanol is used in cleaners, solvents, as fuel, it's in methylated spirits and it is found in wine.

2. (half) A hydrocarbon is ONLY hydrogen and carbon.

3. (x) Well, I guess so but it's to do with the way the bonds are. Because of carbon's electron arrangement, it shares electrons rather than exchanging them. In an alkane, each carbon is bonded to 1 or 2 other carbons and the other bonds are used up by hydrogen atoms. (I'll put up a diagram - it's quite simple really.) In an alkene there is a double bond - two of the carbon atoms are joined together by a double bond. (Another diagram is called for.)

4. (x) Carbonic acid, but when it's not under pressure it just turns into water and carbon dioxide. It is also slightly acidic.

5. (tick!) Yes! Burn :D I'm not sure about explode :P

6. (x) Oxygen. Always oxygen, I'm afraid.

7. (half) Yes. But not because it's too dense. To conduct electricity, the atoms must have one electron at least that's not bonded to anything - so that it can move around and, well, conduct. (Carbon atoms in this case, by the way :P) Diamond is structured so all the electrons are bonded, so it cannot be a conductor. (In a test, you only get the mark if you then say it is an INSULATOR. Lol.)

8. (x) Yes. Because it has a free electron. This is carbon again, too.

9. (x) Well, you're right but off the topic a bit, I'm afraid. An allotrope is a form of the pure element, because some can be arranged in more than one way and depending on the way they are arranged they have very different properties - for example diamond and graphite are both forms of carbon.

10. (x) Nitrogen is about 78% of the air, and it's normally very unreactive, but it can react in car engines with oxygen, forming these gases. It contributes to acid rain which lowers the pH of rivers and lakes harming wildlife in them, erodes buildings and is harmful to forests.

Jelly's TOTAL = 2.

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