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Properties of Matter: Investigation 3 –

PreLab

 

 

 

 

 

 

 

ASK WHY

By observing a sample of matter and measuring its chemical and physical properties, we gradually acquire enough information to characterize it and distinguish it from other kinds of matter. This is the first step in the development of chemical science, in which interest is focused on specific types of matter.

BRANCH OUT

Soil scientists might study the composition of soils on Mars to determine what elements they contain or chemically evaluate soil nutrient levels in a farming community to determine what crops would grow best there.

GET FOCUSED

Answer the following Focus Questions: 

  • Do compounds composed of the same elements have identical properties? 
  • Can compounds composed of different elements have similar properties? 

GO DEEPER

Read the Background(s) in the Investigation in your SDR. When you have finished, consider the following concepts as a class:

  • Compounds are substances made up of two or more elements.
  • Each element in a compound is represented by a one or two-letter symbol.
  • Solubility refers to the ability of a solid to dissolve in a liquid.
  • Miscibility refers to the ability of a liquid to mix with another liquid.

LEARN THE LABLEARNER LINGO

The following list includes Key Terms that are introduced in the Investigation Background(s). They should be used, as appropriate, during everyday classroom discourse.

  • solubility
  • miscibility

SET FOR SUCCESS

  • Your investigation of properties of matter will continue, but will focus on additional properties of compounds. 
  • Review the relationship between molecular formulas and compounds emphasizing that formulas indicate the elemental composition of compounds.
  • You will be investigating a new property of compounds: the solubility of liquids and solids in water. 
  • If necessary, review the term solubility. 

Note: In this investigation, you will test whether solids dissolve (are soluble) in water and whether liquids mix (are miscible) in water.

  • Complete the Recall section in your SDR.
  • Play the video below. Remember to follow along with your SDR and make any notes that you think might be helpful.
  • After the video, divide into your lab groups to discuss your strategy for the lab. For example, you may assign certain group members to perform specific functions during the lab.

Note: The purpose of the video is to allow you to anticipate the laboratory experience you will soon encounter. You should leave the PreLab session with a firm idea of what to expect and how to perform in the lab.

Note: Homework is posted below the video.

 

HOMEWORK

Review the Investigation procedures and watch the video above in preparation for the Lab.