Edexcel Jun 2011 Paper 1 Q16 (with explained solutions) |

Skip to content

Edexcel Jun 2011 Paper 1 Q16

Answers available below

PMT SECTION B Answer ALL the questions. Write your answers in the spaces provided. 16 The first ionization energy of each of the elements from neon to argon is shown on the graph below. The first ionization energy of potassium has been omitted. 2500 2000 1500 1000 500 Ionization energy / kJ mol1 0 Ne Na Mg Al Si P Elements Cl Ar (a) Define the term first ionization energy. (3)10 *P38433A01024*<br />
PMT (b) Explain why, in moving from Na to Ar, the general trend is for the first ionization energy to increase. (3)(c) Explain why the first ionization energy decreases from P to S. (2)(d) Estimate the value of the first ionization energy of potassium, K, and write your answer below. (1)kJ mol1 (Total for Question 16 = 9 marks) *P38433A01124* 11 Turn over<br />

Show answer

Section B Question Number 16 (a) Question Number 16 (b) Mark Mark Acceptable Answers Reject Energy / enthalpy produced Just gaseous element First mark The energy (allow enthalpy / heat) required (allow change) per mole (1) Second mark to form (gaseous) singly charged positive ions Or to remove (1 mole of) electrons (1) Third mark from gaseous atoms (of the element) (1) X(g) X+(g) + e(-) scores last 2 marks Ignore standard conditions Per mole scores at any point Acceptable Answers Reject charge density orbitals, sub- shell Nuclear charge / effective nuclear charge / number of protons / atomic number increases (1) Two of (Outer) electrons in the same (quantum) shell / same number of electron shells (1) Shielding (of nucleus)(about) the same (1) Distance from nucleus/atomic radius less (1) 6CH0101 1106<br />
Question Number 16 (c) Question Number 16 (d) Reject Mark Acceptable Answers Route 1 Electrons (in the p sub-shell) are paired (for the first time) (in S) / two electrons occupy the same (p) orbital / full orbital / electrons-in- boxes diagram (1) repulsion between the (paired) electrons (reduces IE) (1) Route 2 P has a half-filled p sub-shell / half- filled p orbitals which is stable (1) (on ionization) S gains a half-filled p sub-shell / half-filled p orbitals (1) Acceptable Answers Reject Mark 200490 (kJ mol1) Negative values 6CH0101 1106<br />

Question 16 17 18 19 20

About us | Need Help? | Feedback

Proudly powered by WordPress | Theme: Sydney by aThemes.