Suggest why the size of atoms increase on going down the group.
Here's taking a look at what I wrote:
As we go down the group, the relative radii of the atoms
increases. This is because the atoms have more electrons down the
group, thus the size of atoms increases.
Why the size of atoms decrease on going across a period.
on going across a period, the relative radii of the atoms of the
elements decreases. This is due to the increasing number of protons
in the nucleus. Protons make little contribution to the size of
atoms, but they increase the positive charge of the nucleus, as a
result, drawing the electrons into tighter orbitals. Thus size of
atoms decrease on going across a period.
Do these suffice?
Then there's another question
The following results were obtained in experiment on the
solubility of sucrose in water performed at T deg cel.
Mass of evaporating dish = 25.0 g
Mass of evaporating dish + saturated solution of sucrose =
200.0g
Mass of evaporating dish + sucrose = 150.0g
From these results (eh, there's also a solubility curve that
tells me the solubility of sucrose in 100g of water at different
temperatures), work out the value of T.
I only need a rough guide on how to obtain the value of T since
I can't provide you guys the graph.
Thanks
I will assume the mass of water to be 50g and amount of
sucrose dissolved to be 125g base on what is given. If that is so,
100g of water will dissolve 250g of sucrose so u get the T from
that amount.