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Which are the strongest interactions between molecules

Hydrogen bonds are the strongest, which are possible only between H and F, O or N because of the difference in electronegativity; then, permanent dipole-permanent dipole interactions come second as they form...
EB
Answered by Eduardo B. • Chemistry tutor
2725 Views

Calculate the number of moles in a sample of 113.47g of Ca(HCO3)2.

Using the AQA specimen data sheet we see that the RAMs of the following elements areCa = 40.1H = 1.0C = 12.0O = 16.0Therefore the total mass for one mole isCa + 2x(H + C + O+O+O)= 40.1 + 2x(1+12+16+16+16)= 4...
JL
Answered by Jacob L. • Chemistry tutor
2734 Views

Why is SiO2 a solid whereas CO2 is a gas at room temeperature?

The main factor influencing a given compound's state is the strength of intermolecular forces - those need to be larger than the thermal energy for a compound to be solid/liquid. For CO2 the only type of int...
WG
7913 Views

Why do first ionisation energies decrease down a group?

Ionisation energy is defined as the energy required to remove an electron from a gaseous atom or ion. As we descend down a periodic group we must think about how the atomic radius . As we descend the group t...
JT
4669 Views

Why are transition metal ions in water coloured, but sodium in water is not?

The colour of light is determined by its wavelength. White light is made up of electromagnetic radiation (photons) that spans the range 400nm - 700nm, the visible part of the E.M. spectrum. When white light ...
JH
Answered by Jack H. • Chemistry tutor
3079 Views