Example 1
Example 1
Example 1
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Internal assessment resource Chemistry 2.7A for Achievement Standard 91167<br />
PAGE FOR TEACHER USE<br />
Internal Assessment Resource<br />
Achievement Standard Chemistry 91167: Demonstrate<br />
understanding of oxidation-reduction<br />
Resource reference: Chemistry 2.7A<br />
Resource title: Redox rules<br />
Credits: 3<br />
Teacher guidelines<br />
The following guidelines are designed to ensure that teachers can carry out valid and<br />
consistent assessment using this internal assessment resource.<br />
Teachers need to be very familiar with the outcome being assessed by the<br />
Achievement Standard Chemistry 91167. The achievement criteria and the<br />
explanatory notes contain information, definitions, and requirements that are crucial<br />
when interpreting the standard and assessing students against it.<br />
Context/setting<br />
This activity requires students to carry out oxidation-reduction reactions and<br />
demonstrate understanding of the reactions.<br />
Oxidants and reductants are used in a variety of ways in modern society.<br />
<br />
<br />
<br />
Hydrogen peroxide is used as a bleach, in glow sticks, hydroponics,<br />
disinfectants, and laundry detergents.<br />
Potassium permanganate is used as a disinfectant for hands and feet, to kill<br />
fungal infections, to treat water, and to make props used in film and television<br />
look old.<br />
Potassium dichromate is used as an ingredient in cement, for cleaning<br />
glassware, tanning leather, wood treatment, and analysing alcohol in the<br />
“breathalyser test”.<br />
Conditions<br />
In part 1, students will gather information by carrying out each test tube reaction,<br />
recording their observations and then interpreting their results. In part 2, students<br />
interpret the observations provided.<br />
You will provide three oxidants and three reductants.<br />
You may choose to change the task by using other oxidants or reductants selected<br />
from explanatory note 4 of the standard.<br />
Prior learning required includes an understanding of oxidation numbers, electron<br />
transfer in reactions, oxidants and reductants, balancing oxidation-reduction<br />
equations, and the ability to relate these to experimental observations.<br />
This resource is copyright © Crown 2011 Page 2 of 6
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