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Teacher Portal:

Properties of Matter: Investigation 3 –

Lab

 

 

 

 

 

 

 

ZERO-IN

Italicized font represents information to be shared orally or physically completed with the students at this time.

The non-italicized font represents additional information included to support the teacher’s understanding of the content being introduced within the CELL.

MINDSET

This Investigation is designed to

  • give students the opportunity to test the solubility of certain solid compounds in water,
  • provide students with the opportunity to test the miscibility of certain liquid compounds in water,
  • reinforce students experience with the Triple Beam Balance Use and Operation procedure and the Measuring Mass Using a Weigh Dish or Beaker procedure, and
  • promote students analysis of the relationship between the physical properties of compounds and the elements that compose compounds.

BE PREPARED

Teacher Preparation for the Investigation includes the following. This preparation should be done prior to students arriving in the lab.

  • Fill five 100 ml beakers up to the 100 ml mark with each of the following: baking soda, salt, vitamin C, sugar, and calcium carbonate.
  • Fill three 400 ml beakers with 300 ml each of vinegar, rubbing alcohol and vegetable oil.
  • Fill a one-liter pitcher with water for each group.
  • Fill 5 centrifuge tubes each with 2 ml of red food coloring.
  • Place the materials at the distribution center.
  • Write the following compounds and their formulas on the board.

POM6_3_lab

  • Put all materials at the distribution area.
  • Divide the students into five cooperative groups.

Student Preparation for the Investigation includes having students gather the following materials. This preparation takes place on lab day after student groups have settled at their assigned lab tables. 

Note: The materials are listed in students’ SDRs. They are also listed below for your reference.

  • (1) liter pitcher of water
  • (5) weigh dishes
  • (8) empty 400 ml beakers
  • (1) triple beam balance
  • (1) marker
  • (8) 2 cm pieces of masking tape
  • (1) 100 ml graduated cylinder
  • (1) plastic eye dropper
  • (1) pair of vinyl gloves per student
  • (1) pair of goggles per student
  • (1) centrifuge tube filled with 2 ml of red food coloring
  • (1) glass stir rod

Direct one student from each lab group to collect the materials listed in their SDRs.

INVESTIGATE

  • Explain to students that they will test the solubility of each solid compound in water.
  • Explain to students that they will also test the miscibility of each liquid. 
  • Encourage students to reflect on the PreLab video as they move through the procedural steps.
  • Explain to students that during the Experiment, every procedural step is important. If one step is skipped, data can become invalid. To help students keep on track, direct them to read each step thoroughly, complete the step, then check it off (Read it – Do it – Check it off).
  • Direct students to complete procedural steps in their SDRs.
Note: The procedural steps are listed below for your reference. Teacher “Notes” are inserted, as needed, to help facilitate the lab.
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  1. Review the chemical formula and elemental composition of each solid compound.

a. Locate the formulas in Table A. Make a prediction: Which solids do you think will be soluble in water?

b. Record: Write your predictions in Table A.

Test your predictions:

a. Obtain a small sample of each compound from the distribution center.

b. Use a graduated cylinder to add 100 ml of water to five 400 ml beakers.

c. Use tape and a marker to label each beaker.

d. Measure 10 g of each solid compound using a weigh dish. You may wish to refer to the Triple Beam Balance Equilibration procedure, the Triple Beam Balance Use and Operation procedure, and the Measuring Mass Using a Weigh Dish or Beaker procedure.

e. Each solid should be measured then added to 100 ml of water. Do this one beaker at a time.

f. Each solution should be stirred, using a glass stir rod, for approximately one minute.

g. After stirring, observe the contents of the beaker and determine whether the compound was soluble in water.

h. Record your conclusions in Table A.

POM 3a

  1. Review the chemical formula and elemental composition of each liquid compound:

a. Locate the formulas in Table B.

b. Make a prediction: Which liquids do you think will be able to mix (miscible) in water?

c. Record: Write your predictions in Table B.

  1. Test your predictions:

a. Obtain a small sample of each compound from the distribution center.

b. Add 100 ml of water to three 400 ml beakers.

c. Using the plastic eye dropper add one drop of red food coloring to each of the 3 400ml beakers.

d. Use tape and a marker to label in each beaker.

e. Add 10 ml of each liquid sample to 100 ml of water in each beaker. Do this one beaker at a time.

f. Each solution should be stirred, using a glass stir rod, for approximately one minute.

g. After stirring, observe the contents of the beaker and determine whether the compound was miscible in water.

h. Record your conclusions in Table B.

POM 3b

CLEAN UP

Let students know your expectations for clean up. Ask them to clean up.