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what does magnitude mean in Chemistry?

Explain why the enthalpy change represented by ΔH3 has a lower magnitude for caesium than for sodium
what does magnitude mean??
(edited 6 years ago)
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Avatar for Pigster
Pigster
20
Original post by chemquestion
Explain why the enthalpy change represented by ΔH3 has a lower magnitude for caesium than for sodium
what does magnitude mean??


This should help: http://bfy.tw/H6fV

A link would have been handy.

DH3 is ionisation energy. Oh come on, you did that in Y12!
Original post by Pigster
This should help: http://bfy.tw/H6fV

A link would have been handy.

DH3 is ionisation energy. Oh come on, you did that in Y12!


Okay

http://pmt.physicsandmathstutor.com/download/Chemistry/A-level/Topic-Qs/OCR-A/5-Physical-Chemistry-Transition-Elements/Set-B/Enthalpy%20and%20Entropy.pdf

Question 2c, I don't get what magnitude means.

Answer:
Cs has larger radius / larger atom (not ion) / more shells / more orbitals / more sub-shells (1) correct reference to shielding (1) less powerful attraction (of nucleus) for (outer) e– in Cs (

And question 5c, how is entropy related to increase in temperature?

Also is kJ of heat energy same as the enthalpy change which has units kJ mol-1?
(edited 6 years ago)
Reply 3
Avatar for Pigster
Pigster
20
Original post by chemquestion
Question 2c, I don't get what magnitude means.

Answer:
Cs has larger radius / larger atom (not ion) / more shells / more orbitals / more sub-shells (1) correct reference to shielding (1) less powerful attraction (of nucleus) for (outer) e– in Cs (

Also question 5c, how is entropy related to increase in temperature?
Is there more disorder when there's an increase?


magnitude noun 1.the great size or extent of something.

You did the factors that affect ionisation energy in Y12.

How have you been taught to work out if something is feasible? Using DG or Stot?
Original post by Pigster
magnitude noun 1.the great size or extent of something.

You did the factors that affect ionisation energy in Y12.

How have you been taught to work out if something is feasible? Using DG or Stot?


To work out if something is feasible , we have been taught the Gibbs equation, if G=0 or negative the reaction is feasible.
Reply 5
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Pigster
20
Original post by chemquestion
And question 5c, how is entropy related to increase in temperature?

Also is kJ of heat energy same as the enthalpy change which has units kJ mol-1?


Entropy doesn't change with T, but TDS does.

They are not the same.

Think about q (= mcDT) and DH (=-q/n), i.e. q and DH are different, but related.

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