Wk. 2: Matter, Mixtures, & Measuring

Week #2: Matter, Mixtures, & Measuring

Objectives

  • Describe physical characteristics of provided materials
  • Compare characteristics of provided liquids
  • Identify examples of mixtures of solids, liquids, and gases
  • Apply and evaluate of techniques for separating materials
  • Identify substances that will dissolve in water
  • Record observations and measurements using a chart
  • Evaluate how well the procedures worked and identify possible improvements

Activities

  • Learners discussed examples of mixtures (homogenous and heterogeneous) and pure substances.
  • Learners examined the physical characteristics of the supplied materials (color, texture, smell).
  • Learners created a mixture of salt, sand, and dried peas. They then attempted to separate the components back with different filtering methods.
  • Learners poured together oil, vinegar, and syrup, observing how they interacted. They then added bubble making materials (baking soda, Alka-Seltzer) and observed how the how the bubbles flowed through the liquids.
  • Learners created a simple measuring cup.
  • Learners mixed glue, water, and a catalyst (contact lens solution mixed with baking soda) to create an example slime. They then experimented by using different measures of the ingredients to create a better slime, recording how much of each ingredient they used.

Questions to Discuss

  • What are examples of mixtures of solids, liquids, and gases that you have in your house? Can you find one example of each kind of mixture?
Solid mixed in a SolidSolid mixed in a Liquid
Liquid mixed in a LiquidGas mixed in a Gas
Gas mixed in a LiquidGas mixed in a Solid
  • Which of these is a pure substance or a mixture?

  • Why do you think the three liquids settled into three layers before you stirred them together? What happened after you stirred them?

  • What is one ingredient that you needed to add more of to make a better slime?
  • What is one reason that is it important to record what you used and observed in an experiment?

Things to Try at Home

  • Make a list of slimy materials in your house? What are some ways they are used and why is it important that they are slimy?
  • Look for examples of filters in your home. What are they designed to filter out?
  • Perform an experiment using materials mixed with water or milk that changes its flavor (e.g. chocolate milk syrup, fruit drink powder, tea). Make three drinks, using the proper amount of mix, half as much, and twice as much. What do you observe changing about the color, smell, and taste? What does the label tell you about how much sugar is each of those drinks? (Note – testing the taste does not mean that you have to drink the entire beverage. You should also rinse out your mouth between tastes to reset your taste buds.)
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