Level 2 Chemistry (91164) 2019 - NZQA
[Pages:12]91164
911640
2
SUPERVISOR'S USE ONLY
Level 2 Chemistry, 2019
91164 Demonstrate understanding of bonding, structure, properties and energy changes
2.00 p.m. Monday 11 November 2019 Credits: Five
Achievement
Demonstrate understanding of bonding, structure, properties and energy changes.
Achievement with Merit
Demonstrate in-depth understanding of bonding, structure, properties and energy changes.
Achievement with Excellence
Demonstrate comprehensive understanding of bonding, structure, properties and energy changes.
Check that the National Student Number (NSN) on your admission slip is the same as the number at the top of this page.
You should attempt ALL the questions in this booklet. A periodic table is provided in the Resource Booklet L2?CHEMR.
If you need more room for any answer, use the extra space provided at the back of this booklet and clearly number the question.
Check that this booklet has pages 2?12 in the correct order and that none of these pages is blank.
YOU MUST HAND THIS BOOKLET TO THE SUPERVISOR AT THE END OF THE EXAMINATION.
TOTAL
? New Zealand Qualifications Authority, 2019. All rights reserved.
ASSESSOR'S USE ONLY
No part of this publication may be reproduced by any means without the prior permission of the New Zealand Qualifications Authority.
2
QUESTION ONE
(a) Complete the table below by stating the type of solid, the type of particle, and the type of bonding (attractive forces) between the particles in each solid.
Solid
Type of solid
Type of particle
Attractive forces between particles
Na(s) (sodium)
NaI(s) (sodium iodide)
I2(s) (iodine)
ASSESSOR'S USE ONLY
(b) Sodium, Na(s), is malleable, whereas sodium iodide, NaI(s), is brittle. Explain these observations by referring to the structure and bonding of each substance.
Chemistry 91164, 2019
3
ASSESSOR'S USE ONLY
(c) Compare the solubilities of iodine, I2(s), in water, H2O() ? a polar solvent, and in cyclohexane, C6H12() ? a non-polar solvent. Use your knowledge of structure and bonding to explain the solubility of iodine in these two solvents.
Chemistry 91164, 2019
4
(d) Ice, H2O(s), is often placed into drinks. As the ice melts, the drink cools.
H2O(s) H2O()
DrH = + 6.01 kJ mol?1
Use your knowledge of enthalpy changes associated with changes of state to elaborate on the reason why the drink cools.
ASSESSOR'S USE ONLY
Chemistry 91164, 2019
5
QUESTION TWO
(a) (i) Draw the Lewis structure (electron dot diagram) for the following molecules, and name their shapes.
Molecule
CH4
NCl3
OF2
ASSESSOR'S USE ONLY
Lewis structure
Name of shape
(ii) The above molecules have different shapes; however each molecule has an approximate bond angle of 109.5?.
Justify this statement by referring to the factors that determine the shape of each molecule.
There is more room for your answer on the following page.
Chemistry 91164, 2019
6
ASSESSOR'S USE ONLY
Chemistry 91164, 2019
7
(b) The following table shows the Lewis structures (electron dot diagrams) for the molecules, CHCl3 and NH3.
Molecule
Lewis structure
CHCl3 H
Cl C Cl Cl
NH3
H N H H
Polarity
(i) In the boxes above, identify the polarity of each molecule by writing either polar or non-polar.
(ii) Justify your choices.
ASSESSOR'S USE ONLY
Chemistry 91164, 2019
8
(c) When propane, C3H8(g), is burned, it reacts with oxygen, O2(g), in the air to form water, H2O(g), and carbon dioxide, CO2(g).
C3H8(g) + 5O2(g) 4H2O(g) + 3CO2(g)
rH = ?2056 kJ mol?1
Calculate the average bond enthalpy of the C = O bond using the data below.
HHH H C C C H
HHH
O O
HOH O C O
Bond
C ? C C ? H O = O O ? H
Average bond enthalpy/ kJ mol?1
348 413 495 463
ASSESSOR'S USE ONLY
Chemistry 91164, 2019
................
................
In order to avoid copyright disputes, this page is only a partial summary.
To fulfill the demand for quickly locating and searching documents.
It is intelligent file search solution for home and business.
Related download
- 9701 w19 ms 11 past papers
- national senior certificate nasionale senior sertifikaat
- cambridge international as a level chemistry 9701
- national senior certificate grade 11
- 9701 s19 ms 11
- level 2 chemistry 91164 2019 nzqa
- national senior certificate grade 10 november 2019
- grade 10 november 2017 physical sciences p2 chemistry
- 5070 w19 ms past papers papacambridge
- gcse grade boundaries november 2019
Related searches
- a level organic chemistry notes
- financial management level 2 certification
- level 2 financial management certification
- a level organic chemistry pdf
- a level zimsec chemistry past exam papers
- pearson edexcel level 1 level 2 gcse 9 1 mathematics
- pearson edexcel level 1 level 2 gcse 9 1
- pearson edexcel level 1 level 2 gcse 9 1 mathematics markscheme
- pearson edexcel level 1 level 2 gcse 9 1 mathematics markscheme 2021
- pearson edexcel level 1 level 2 gcse 9 1 1 ma1 2h
- pearson edexcel level 1 level 2 gcse 9 1 mathematics 2021
- pearson edexcel level 1 level 2 gcse 9 1 time 1 hour 30 minutes paper referenc