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Chemistry
A Level

Explain why the first ionisation energy of sulfur is different from that of phosphorus.

The first ionisation energy is defined as, the amount of energy required to remove 1 mole of electrons from 1 mole of gaseous atoms to produce 1 mole <...

Answered by Lydia M. Chemistry tutor
67903 Views

Can you give and explain the mechanism for the reaction between aqueous Sodium Hydroxide (NaOH) and Chloroethane at room temperature? What is a competing reaction which may occur and how would you promote this reaction?

Chlorine is highly electronegative and hence electron withdrawing (briefly ask them what electronegativity is to make sure they're completely comfortable with the concept), so the carbon its directly atta...

Answered by Ned D. Chemistry tutor
6033 Views

For the following reaction, you obtained 7.2 g of sodium sulfate, starting from 10 g of sulfuric acid. Sodium hydroxide is in excess. What is the % yield? H2SO4 + 2NaOH → Na2SO4 + 2H2O

  1. Identify the limiting reagent: you have been told sodium hydroxide is in excess, so you know sulfuric acid is the limiting reagent

  2. Calculate the moles of the limiting reagent: ...

Answered by Rachel B. Chemistry tutor
2683 Views

Define relative atomic mass.

Relative atomic mass is the mass of one atom of an element compared to 1/12 of the mass of an atom of carbon-12.

Answered by Colleen S. Chemistry tutor
2230 Views

Explain why sulfur deviates from the general trend in ionisation energies across period 3.

Sulfur has the electronic structure [Ne]3s2 3p4. This means there are 2 electrons in the same p orbital. These repel each other making it easier to remove the electron causing the ionisation energy to be ...

Answered by Angus M. Chemistry tutor
10708 Views

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