- What’s an alpha particle?
- A decayed neutron?
No, it’s a helium nucleus; 2 protons and 2 neutrons.
2. What’s the mass of one mole of Carbon-12?
- ugh, I don’t know moles.
12g. I know, that’s almost a head-smacker.
3. What’s neutral pH?
- I remember the half-way point between alkaline and acid is at 7 on the scale. Acids are higher than that, and bases are lower.
Good!
4. What’s absolute zero in Celsius?
- Well, it’s 0º Kelvin.
I do remember that it’s like -460ºF… But I can’t remember it in Celsius! sigh I’ll take a stab. Here’s my logic:
Freezing point = 0ºC / 32ºF — Boiling Point = 100ºC / 212ºF… ergo… that’s a spread of 100 degrees for C, and 180º for F.
That’s a 1:1.8 ratio.
So, -460 ÷ 1.8 = -255.6ºC?
If I get that right, I’ll eat my hat.
That’s actually a very good college try at the problem. Absolute zero is -459.67 F (I had to use Google). In fact, I’m at a loss right now as to how you’re as far off as you are. AZ in Celsius is -273.
Ah! I think the problem is that standard high school algebra assumes that 0 is in the same place for all numbering systems, or more to the point, that you’re using the set of integers, etc, and that 0 is something they have in common. In this case, it’s not.
Yes! The back of the envelope confirms it. F freezing is 491.67 degrees from AZ, which divided by 1.8 yields -273.15C, which is even more accurate that what I had said above.
5. All elements heavier than lead are ___________.
- Transition Metals?
Radioactive. (Not only are they not all under the trough in the periodic table, at least 2 aren’t metals. But I admit I looked at a periodic table for that second part.)
6. What is the heaviest naturally occurring element?
- Uranium?
Good!
7. Name 3 indications that a chemical reaction has happened.
- Change in temperature; change in volume; change in color? (I’ll bet that’s not what you were looking for :sobs: )
Well, we have to decide what to do with “change in volume” and “change in temperature”. I can heat a bridge girder and expand it until the rivets fall out, but that doesn’t mean it’s not still bridge steel just like before. I’ve also supplied the heat from an outside source. If you really meant that you mix something and heat came out on its own, then you can have that one. If I just pop a balloon, the gas inside will expand in volume. That’s just a spreading out, not a chemical reaction.
So: 2 Right, 4 Wrong, 1 is 2/3 Right?
Asked: 32
Right: 13
Wrong: 17
Unsure: 2?
Total: -4