Which of the following substances may be condensed using a
water-cooled condenser?
Substance
Melting point/deg
cel
Boiling point/deg cel
A
-120
-4
B
-30
15
C
10
40
D
60
95
Eh, not sure what's the criteria needed for this to happen... my
guess would be B. It would be great if someone could spell out the
conditions for this to occur.
2. Tritium (symbol T) is an isotope of hydrogen. Which formula
is incorrect for tritium compound?
NT3
CT4 BaOT
T2O
The answer is definitely BaOT because the formula for the other
3 compounds are all correct. But why BaOT?
3. Next.
W is a non conductor of electricity in both solid and
liquid state and when hit with a hammer, it doesn't change
X is a good conductor of electricity in both solid and liquid
states and flattens when hit with a hammer
Y is a non-conductor in solid state but good conductor in liquid
state, it shatters when hit with a hammer
What are W,X and Y?
2 possible options:
W - SiO2 X - Na Y - CuSO4
W - Br2 X -
Zn Y - CaO
I think the answer is the first option because how do you test
the malleability of Bromine? At least SiO2 doesn't change when hit
with hammer. Weird to hit Br2 (liquid) with hammer. HAHA.
Lastly
The ratio of the number of atoms present in 5 g of Argon gas,
Bromine gas , and Neon gas would be
A 1:1:1
B 2:1:1
C 2:2:1
D 2:4:1
Please explain to me how to calculate this.... do you find no.
of moles and multiply with the avagadro constant?
Thanks!