Chemistry questions - 10 points up for grabs!?

Question

1) Why could violent splattering occur when water is added to a concentrated acid (as in why is it more likely to do so than when water is added to, say, juice)?

2) Why does adding water slowly to a concentrated acid prevent or minimize this possible violent splattering?

3) If H2S(g) + 2O2(g) ---> 2H2O(g) + SO2(g), then how much H20(g) is produced when 2mol of H2S(g) react with excess O2? I get 4 mol as the answer, and unless I haven't balanced the equation correctly, I don't know why I would be wrong. Apparently, the answer is supposed to be 2mol, but I don't understand why.

4) How do oxidation numbers work (which elements have assigned values and what are these values)?

5) How do you work out the density of a gas at a given temperature and pressure (e.g. C2H4 at 0 degrees celcius and 1 atmosphere)?

6) What is 'increased randomness'? Two examples in which it results are the melting of ice and the mixing of He and Ne.

7) How do you work out the volume of a gas at 1 atm when you've been given the volume of the gas when collected over water, the vapour pressure of the water, and atmospheric pressure. Temperature is constant and the molarity of the gas can be worked out from a balanced equation.

Also, please could you summarize the electron orbital system for me? E.g. 1s can hold 2, 2s can hold 2, and so on...

Thanks in advance!

Answer 1

lol pay attention in class

Answer 2

do your own d**n homework

Answer 3

4.Elements have an oxidation no. 0 eg Mg

    A monatomic ion eg Mg+2 has an oxidation

    no. same as its charge i.e +2

    Oxidation number of  a hydrogen is only

    different when it is bonded to a metal           otherwise it is always +1

      oxygen is always -2 when oxygen is not in peroxides or super oxides or when bobded to fluorine.

  Fluoride has an oxidation no. of -1 always

  

6. Incresed randomness means that the molecules are moving faster with more energy.

7. 1s can hold 2

     2s=2

     2p=6

     3s=2

     3p=6

     3d=10

     4s=2

     4p=6

     4d=10

  1. The acid reacts with water whereas in the case where you add water to juice the juice and water are just mixed not reacted .