A few basic Physics (properties of matter) questions help, PLEASE?

Question

1) These type of compounds are good conductors of electricity when their aqueos solution is taken. (My answer is ionic bonded compounds- is it correct?)

2) Bronze is created using copper and ___ (begins with a T) (is it tin?)

3) Sulphuric acid when added to sugar converts it into a black residue, carbon, This shows that sulphuric acid has the property ___________ (11 letters)

4) Gases which can be liquefied just by increasing the pressure are termed as _____ (5 letters, is it vapours?)

5) This gas is released with oxygen gas when metal nitrates from group II or lithium nitrate are heated, but not liberated when other nitrates of group I are heated at Bunsen temperatures. (15 letters)

6) What is Bunsen Temperature?

7) Reactions which liberate energy are termed as __________ (10 letters)

8) This metal is brittle at room temperature but malleable when heated and is used in many alloys of different types. (4 letters- lead?)

9) Instant coffee (and salt?) on being exposed to air turns from a dry powder to sticky liquid. This shows that instant coffee is ____________ (12 letters) (hydrogynous?)

gintable · Accepted Answer

1) ionic compounds is correct
2) bronze = copper + tin is correct.
3) Dehydration
4) "vapor", the US spelling of the singular word.  This is why we say "methane gas", but "water vapor".  If a substance is in a seemingly gaseous phase, but isn't above its critical point in temperature, it is a vapor.  If it is above its critical point, it is a gas.  The ideal gas law applies best to gasses, and not quite as well to vapors.  These really are the same phase of matter, just two general condition region names.
5) the maximum temperature to which you can heat an object placed in the flame of a bunsen burner.
7) exothermic
8) the answer is more likely "iron".  Lead and gold are both extremely malleable both at room temperature.  Iron in its nearly elemental versions can be quite brittle (not as much as glass or ceramics though).  When alloyed with carbon, you get steel, which is a more ductile version of iron.
9) don't know this one, but I doubt "hydrogynous" is the answer.  First, it is spelled wrong, second, all it seems to mean is that is contains the element hydrogen.

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A few basic Physics (properties of matter) questions help, PLEASE?

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