oneone CS-9A Objective: To utilize the skills and processes of science in order to identify an unknown substance. CSI Note: How can the unknown substance be identified? Drill: 1. Get a Lesson Sheet from the SET. 2. Complete the Drill portion only in your log book.

oneone CS-9A Identify as many characteristic properties as you can think of. Density Boiling Point Freezing Point Color Solubility Hardness Taste Magnetism Conductivity Think about what properties we can explore in class.

oneone CS-9A Look at the possible tests/measurements that can be made on the unknown in a laboratory situation. Tell which tests you can/should explore. Justify your selections.

oneone CS-9A Density Yes It is a characteristic property.

oneone CS-9A Taste No It is a characteristic property, but it is unsafe to taste unknown substances.

oneone CS-9A Color Yes It is a characteristic property.

oneone CS-9A Boiling Point No It is a characteristic property, but we do not achieve the temperatures necessary to do this..

oneone CS-9A Shape No It is not a characteristic property.

oneone CS-9A Solubility Yes It is a characteristic property.

oneone CS-9A Magnetism Yes It is a characteristic property.

oneone CS-9A Mass Yes It is a not a characteristic property, but it is necessary to calculate the density.

oneone CS-9A Volume Yes It is not a characteristic property, but it is necessary to calculate the density.

oneone CS-9A Conduct the Investigation

oneone CS-9A Materials: Unknown substanceCalculator Graduated cylinderRuler Paper towelsPaper cup Triple beam balanceWater MagnetSpoon

oneone CS-9A Procedures: Color 1. Observe the mystery substance. 2. Enter the color into the data chart.

oneone CS-9A Procedures: Density 1.Zero the triple beam balance. 2.Place the solid on the triple beam balance, and determine its mass. 3.Record the mass in the data chart. 4.Using a cup, add between 30mL and 60mL of water to the graduated cylinder. 5.Record the volume of water in the Volume Side Chart as your starting volume.

oneone CS-9A Procedures: 6.Carefully slide the substance into the graduated cylinder. 7.Record the total volume in the Volume Side Chart. 8.Calculate the volume of the substance by subtracting the starting volume from the total volume. 9.Record the volume of the substance in the Volume Side Chart.

oneone CS-9A Procedures: 10. Calculate the density of the object by dividing the mass by the volume. 11. Record the density in the data chart.

oneone CS-9A Procedures: Magnetism 1. Dry off the substance. 2. Touch the magnet to the substance and observe the reaction. 3. Record the reaction in the data chart.

oneone CS-9A Procedures: Solubility 1.Fill a cup halfway with water. 2.Carefully place the substance into the water. 3.Stir the substance with a spoon. 4.Record the reaction in the data chart.

oneone CS-9A ANALYSIS

oneone CS-9A Examine Chart 1, “Unknown Possibilities”. It provides a list of the suspects and the characteristic property that they leave behind. It also provides key characteristic properties for each substance. Unknown Possibilities SuspectSubstanceColorBoiling Pt ( o C) Solubility In Water Density (g/mL) Magnetic Yes/No Slick NickNickelSilver2914NO8.9YES Al FoilAluminumSilver2467NO2.7NO Sylvia Shine Silver 2163NO10.5NO Cupric Carl Copperreddish2563NO8.96NO So ShadySodiumSilver883YES0.97NO

oneone CS-9A Compare the results from the examination of your mystery substance with the substances in the chart. Check off the characteristics that match your substance.

oneone CS-9A What substance do you think you discovered? Who do you think committed the crime? Why? (It is possible that you can’t yet identify the mystery substance, and that you no longer have any suspects.)