Ranges of mp and bp

[|ll|lll|]

^ what's the unit?

And is this actually true?

Intermolecular Distance between the Gas Molecules

When the gas is heated up,
For Fixed container (Fixed volume)
-   Intermolecular between gas molecules are very weak. Therefore, heating will just cause the molecules to mover further apart from one another.
-   However, for a fixed cylinder, the gas molecules are restraint to mover further apart. Thus, the intermolecular distances between the molecules are the same.

For Non-fixed container (Allows for expansion of gas)
-   Intermolecular between gas molecules are very weak. Therefore, heating will just cause the molecules to move further apart.
-   However, for a non-fixed cylinder, the gas molecules are not restraint to mover further apart. They are allowed to expand. Thus, the intermolecular distance between the molecules will increase.

The intermolecular distances remain the same when the heated gas is restraint from expanding. The intermolecular distances increase when the heated gas is allowed to expand.

I've learnt that in year 9 physics module, but I know some of the stuff we learnt are theoretical based and not all are always true. Such as things like, all cells have a nucleus *sus*   :idiot2:

[Mao]

^ what's the unit?

Temperature vs Time.

And is this actually true?

Intermolecular Distance between the Gas Molecules

When the gas is heated up,
For Fixed container (Fixed volume)
-   Intermolecular between gas molecules are very weak. Therefore, heating will just cause the molecules to mover faster.
-   However, for a fixed cylinder, the gas molecules are restraint to mover further apart. Thus, the intermolecular distances between the molecules are the same.

For Non-fixed container (Allows for expansion of gas)
-   Intermolecular between gas molecules are very weak. Therefore, heating will just cause the molecules to move faster.
-   However, for a non-fixed cylinder, the gas molecules are not restraint to mover further apart. They are allowed to expand. Thus, the intermolecular distance between the molecules will increase.

The intermolecular distances remain the same when the heated gas is restraint from expanding. The intermolecular distances increase when the heated gas is allowed to expand.

Also keep in mind gases naturally expand, so they will fill up the largest available volume.

[|ll|lll|]

Is aluminium sulfate a soluble compound? Based on the solubility table, it is.
However, I read that it often exists as a hydrated compound which vaguely suggests anything...

Are the solubilities of oxides similar to hydroxides too? (i.e. Group I and ammonium all soluble, group II sparingly soluble etc.)

Also, when water is undergoing latent heat of fusion/vaporisation, temperature remains constant. Is it true that it does not gain kinetic energy but instead, the heat energy is converted to potential energy as the molecules break free and move further away from each other?

[REBORN]

AFAIK anything with amonium ion is soluble.

[Mao]

Is aluminium sulfate a soluble compound? Based on the solubility table, it is.
However, I read that it often exists as a hydrated compound which vaguely suggests anything...

Are the solubilities of oxides similar to hydroxides too? (i.e. Group I and ammonium all soluble, group II sparingly soluble etc.)

Don't worry about hydrated salts. Hydration is part of coordination chemistry, which you learn when you get to uni.
For everything else, http://chemistrybrain.files.wordpress.com/2011/05/solubility_chart.jpg

Also, when water is undergoing latent heat of fusion/vaporisation, temperature remains constant. Is it true that it does not gain kinetic energy but instead, the heat energy is converted to potential energy as the molecules break free and move further away from each other?

Yes.

[Mao]

^ Thanks again mao!

Is aluminium sulfate a soluble compound? Based on the solubility table, it is.
However, I read that it often exists as a hydrated compound which vaguely suggests anything...

Are the solubilities of oxides similar to hydroxides too? (i.e. Group I and ammonium all soluble, group II sparingly soluble etc.)

Don't worry about hydrated salts. Hydration is part of coordination chemistry, which you learn when you get to uni.
For everything else, http://chemistrybrain.files.wordpress.com/2011/05/solubility_chart.jpg

Gotta love this table. What does a dash represent? Wouldn't it just be soluble? :laugh:

Dash represent the mixture would be chemically unstable, and a reaction will take place (e.g. ammonium + hydroxide will be an acid/base reaction, giving NH3(g) and H2O)

[|ll|lll|]

More questions on Redox

1) Is this a redox equation?
Mg(s) + H+ (aq) --> Mg2+ (aq) + H2 (g)
What's the difference between that and this:
Mg (s) --> Mg2+ (aq) + 2e-

2) Why is the oxidation number of F zero when it forms a compound with itself?
E.g. The oxidation of F in F2 is 0 while the oxidation of F in HF is -1?
Is it because one of the fluoride ions has an oxidation no. of +1 and the other has an oxidation no. of -1 and then it totals up to 0?

[tony3272]

More questions on Redox

1) Is this a redox equation?
Mg(s) + H+ (aq) --> Mg2+ (aq) + H2 (g)
What's the difference between that and this:
Mg (s) --> Mg2+ (aq) + 2e-

2) Why is the oxidation number of F zero when it forms a compound with itself?
E.g. The oxidation of F in F2 is 0 while the oxidation of F in HF is -1?
Is it because one of the fluoride ions has an oxidation no. of +1 and the other has an oxidation no. of -1 and then it totals up to 0?

1) That is a redox reaction, although the coefficient in front of the H+ should be 2.
The second equation you wrote is a half-equation. It is just part of the full equation that shows what happens to the Magnesium.

[REBORN]

Weak acids don't completely ionise. Other way = y12.