Physical and Chemical Properties

Topics: Chemistry, Chemical reaction, Chemical substance Pages: 5 (1013 words) Published: April 30, 2014
Laboratory Report 6
Date Performed: 04/02/14
Date Submitted: 04/15/14
Name: Lisa Jacoby

Title:
Physical and Chemical Properties

Purpose:
Investigating the chemical properties of pure chemical substances as well as exploring the physical properties of pure chemical substances

Procedure:
1. I half-filled one well of a 24-well plate with 6M HCl and half-filled a second well of the 24-well plate with 6 M NaOH. I then sucked up these chemicals into their labeled pipets. I then set aside for later 2. I performed the following steps on each substance to be tested. I completed all tests of one substance and recorded my observations before proceeding to the next. a. I placed a 4 small test tube into the wells of my 24-well plate b. I then placed small amounts of the substances to be tested in each of the 4 micro test tubs 3. First test tube:

a. I examined the color and odor of each substance then recorded it in my Lab Assistant Report. b. I light the burner fuel wick. Grasped the test tube with the holder and heated the sample by slowly moving it just above the flame. I oberved the effect of heat on each of the substances and noticed if any gasses were released. I recorded c. I allowed the test tube to cool before storing so the well plate plastic didn’t melt and start a fire because I do not have renters insurance. 4. Second test tube:

a. I added cold water to fill the test tube ¼. I stirred with the glass stirring rod. b. I lit the burner fuel wick. Grasped the test tube with the holder and heated the sample by slowly moving it just above the flame, making sure the flame was directed toward the top of the water and the test tube’s open end was not pointed at anyone. I then gently heated the water just to boiling point. (observe in hot h20) c. I tore off approximately ½-cm pieces of both red and blue litmus paper. d. I allowed the solution to cool, and used the glass stirring rod to then transfer a drop of the solution onto a piece of litmus paper (record results. Then I cleaned the stirring rod. 5. Third test tube:

d. a. I added a few pipet drops of HCl to the sample and stirred. I record any apparent reaction or solubility. I then recorded it in my Lab Assistant Report .Then I cleaned the stirring rod.

6. Fourth test tube: I added a few pipet drops of NaOH to the sample, and then stirred. (record any apparent reaction or solubility……………Then I cleaned the stirring rod 7. I cleaned the 4 test tubes and let dry. (repeat steps 2-6 with next substance)

Data Table 1: SOLUBILITY OR REACTION
Substance Name
Color
Odor
Effect of Heat

Cold H2O

HOT H20

Litmus Test

Dilute HCl

Dilute NaOH

Mg
Small silver flakes
No apparent odor
The silver darkened a little, melted a little on the bottom
Non-soluble, micro bubble arose off the Mg
Non-soluble, however shed little white flakes
Red: drop turned purple. Blue: it darkened with a darker border fizzed immensely as thought it was dissolving
The solution stopped fizzing and thickened. Looked gelatinous. Cu
Small copper balls
No apparent odor
The copper color changed to dark silver
No delta
No delta
Red: no color change
Blue: darkened
No rxn but the copper balls color is copper again
The solution turned seaweed green, clear and bubbly. The copper has spots of black on the balls Zn
Bigger silver flakes
No apparent odor
No delta, may have melted a little on the bottom
No delta
No delta
Red: no color change
Blue: darkened
Fizzed but not as much as Mg, similar rxn though
A layer of cloudy thicker solution settled/separated ½ way to the top Mgo
White powder
No apparent oder
A little gas emitted and turned slightly brownish
Dissolved some but not completey, separated after a few minutes Boiled quickly and spattered out of the test tube, soluble
Red: turned dark purple
Blue: no color change.
No reaction
No reaction...
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