Top answers

What at the alkali metals?

These are the group one elements on the periodic table. They are highly reactive so are stored under oil. When they react with water it is often a violent reaction. It also turns to water alkaline, hence why...
ES
Answered by Edward S. • Chemistry tutor
4618 Views

Why does ethanoyl chloride have a lower boiling point that pentanoyl chloride?

This question is referring to the size of molecule and its relation to boiling point. The boiling point is higher when the intermolecular interactions are weaker. Intermolecular interactions are weaker in sm...
TH
Answered by Tom H. • Chemistry tutor
4647 Views

State the trend in electronegativity for the elements of group 17 and explain why this trend occurs.

Electronegativity decreases from fluorine to astatine in group 17. This is because fluorine has the smallest number of electron shells in the group, which means there is less of a shielding effect than there...
CD
Answered by Conor D. • Chemistry tutor
15622 Views

Why is 2-trichloroethanoic acid such a strong acid?

Cl is very electronegative, which makes it electron withdrawing. This means the three Cl substituents pull electrons from the O-H bond. This causes further polarisation of the O-H bond, which means there is ...
LS
Answered by Lucy S. • Chemistry tutor
3604 Views

Calculate Gibbs free energy when S = 131 J mol-1 and H = 155 kJ mol-1 at 25 C, stating whether or not the reaction is feasable.

First, make sure everything is in the correct units: H = 155 kJ mol-1 = 155000 J mol-1 S = 131 J mol-1 T = 25 C = 298K Then use the Gibbs equation to calculate the free energy: G = H - TS G = 155000-298*131 ...
IH
Answered by Isaac H. • Chemistry tutor
2620 Views