AS 90944 Rate of Reaction Homework
Watch the tutorial on rate of reaction before attempting your homework
Watch the tutorial on rate of reaction before attempting your homework
Play the presentation Chemical equations and calculations. Pay particular attention to the worked example before doing the example at the end of this post
Example to be handed in tomorrow
Hydrochloric acid solution was titrated with standard sodium hydroxide solution.
Before the titration the acid was diluted by making 1ml of solution up to 20ml(1:20) in a volumetric flask
20 ml samples of the acid in conical flasks were titrated by running standard sodium hydroxide solution ( 0.15 molL-1 concentration) in from a burette using phenolphthalein indicator
Titration Results
Volume of hydrochloric acid=20ml
|
Titration |
rough |
titration 1 |
titration 2 |
titration 4 |
titration 5 |
|
Final volume (ml) |
26.35 |
49.60 |
24.50 |
50.00 |
47.80 |
|
Initial volume (ml) |
00.00 |
25.20 |
00.20 |
27.00 |
23.30 |
|
Titre (ml) |
26.35 |
24.40 |
24.30 |
23.00 |
23.50 |
On your own paper:
Look through the presentation on diamond and graphite before tackling the question based on one in the 2011 paper.
This question is based on the 2011 paper.
The structurfe of quartz
Silicon and oxygen atoms are arranged in a three dimensional covalent network. A portion of such a framework is shown here. In this arrangement, the stoichiometry is reduced to SiO2, (each silicon has a half share of four oxygens) which is often called silica. A collection of small pieces of quartz is sand.
Tackle both questions on quartz and zinc below.