Oneone CS-9A Objective: To utilize the skills and processes of science in order to identify an...

oneCS-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.

Identify the Unknown

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Identify as many characteristic properties as you can think of.

Density Boiling Point Freezing PointColor Solubility HardnessTaste Magnetism Conductivity

Think about what properties we can explore in class.


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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.


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Density

Yes

It is a characteristic property.


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Taste

No

It is a characteristic property, but it is unsafe to taste unknown substances.


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Color

Yes



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Boiling Point

No

It is a characteristic property, but we do not

achieve the temperatures necessary to do this..


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Shape

No

It is not a characteristic property.


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Solubility

Yes



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Magnetism

Yes



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Mass

Yes

It is a not a characteristic property, but it is necessary

to calculate the density.


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Volume

Yes

It is not a characteristic property, but it is necessary

to calculate the density.


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Conduct the Investigation


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Materials: Unknown substance Calculator

Graduated cylinder RulerPaper towels Paper cup

Triple beam balance WaterMagnet Spoon


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Procedures:

Color

1. Observe the mystery substance. 2. Enter the color into the data chart.


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Procedures: Density1. 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.


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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.


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Procedures:

10. Calculate the density of the object by dividing the mass by the volume.

11. Record the density in the data chart.


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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.


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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.


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ANALYSIS


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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


Suspect

Substance

Color Boiling Pt (oC)

SolubilityIn

Water

Density

(g/mL)

MagneticYes/No

Slick Nick

Nickel Silver 2914 NO 8.9 YES

Al Foil Aluminum

Silver 2467 NO 2.7 NO

Sylvia Shine

Silver Silver 2163 NO 10.5 NO

Cupric Carl

Copper reddish 2563 NO 8.96 NO

So Shady

Sodium Silver 883 YES 0.97 NO

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Compare the results from the examination of your mystery

substance with the substances in the chart. Check off the

characteristics that match your substance.


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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.)


Oneone CS-9A Objective: To utilize the skills and processes of science in order to identify an...

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