ap chem help needed?

Question

which of the following oxides is a gas at 25*C

a Rb2O
b N2O
c Na2O2
d SiO2
e La2O3


telll me what it means if oyu know, i want ot know how to do future probs like this

thank you for your answers

Answer 1

the answer is b. This is due to the bonding formation of the compound. A, C & E are all ionic compounds - therefore highly unlikely to form gases at room temperature. D is a silica compound which can form covalent networks - and is unlikely to be in gaseous form, which only leaves B because this can only form weak dipole-dipole bonds (these tend to be in gaseous form - like SO2, SO3 etc)

Answer 2

b) nitrous oxide

The other oxides are solids.

The simplist way would be to look up the properties of each individually (could even use wikipedia) and process by elimination.

Answer 3

N2O
it is a gas which makes people laugh when breathing in