Reflection: Testing for Dissolved Oxygen - Section 1: Introduction


The demonstration activity described in the introduction of this lesson provides students with a means to understand new units of measure. In the dissolved oxygen, nitrates, and phosphates tests, students use parts per million as their unit of measurement. This presents a problem for most students as it is difficult for students to build a conceptual understanding of a unit measurement that is so small. I conduct the food coloring demonstration to help students understand this difficult concept. This demonstration allows students to link the idea of parts per million to a concrete example with familiar materials. This activity can be repeated throughout the year with different materials to help students continue to build on their understanding. 

  Helping Students Understand Small Units of Measure
  Helping Students Understand Small Units of Measure
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Testing for Dissolved Oxygen

Unit 6: Watersheds and Water Quality
Lesson 4 of 10

Objective: SWBAT use a chemical test kit to determine the level of dissolved oxygen in a water sample.

Big Idea: Dissolved oxygen is a key indicator of water quality as high dissolved oxygen is necessary to support life.

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Science, Human Impact on Earth, water, Environmental Education
  40 minutes
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