Reflection: Adjustments to Practice Mixtures: Characteristic Properties - Density Tube Demonstration - Section 4: Collaborative


One problem that teachers face all the time is choosing the depth to teach a topic. Now I know that depth and complexity are the big words right now...but the truth is you can't always teach to depth because teachers are on deadlines. Sometimes you have to have faith that the seeds you are planting now will be harvested in later years.

This simple lab is a great example of this. Some years, when the emphasis of the district or school is on graphing or analysis, I will spend and entire day on this lab. We take class data, have conversations about error, make histograms, and line graphs. This year, the emphasis in my district is on a simple understanding of density and reading and writing.  My curriculum guide states that my job is to show students how to use density to separate substances.  This lab does this well without deeper discussions.  It can be frustrating as a teacher to feel constricted and have to make these decisions, but you have to have faith that the scope and sequence serves the students' needs. When I have confusion or questions  about depth, I always contact my district's curriculum expert who is also a science teacher but has a district view versus a classroom view.  

  Choosing Depth
  Adjustments to Practice: Choosing Depth
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Mixtures: Characteristic Properties - Density Tube Demonstration

Unit 8: Mixtures: Characteristic Properties
Lesson 6 of 11

Objective: Students will be able to see how density can be used as a method for separating liquids and solids.

Big Idea: What will happen when liquids of different densities are put together?

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3 teachers like this lesson
Science, density, solids, liquid, gas, mixture, property
  35 minutes
density tube
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