Lab Chemical and Physical Properties

Topics: Chemistry, Chemical substance, Chemical reaction Pages: 33 (2790 words) Published: February 3, 2015
Jonah Bluh!
Honor’s Chemistry !
Experiment Number 6 !
November 28, 2014

!
!

Physical and Chemical Properties!

Purpose/Hypothesis:!
• The purpose of this experiment is to investigate the chemical and physical properties of pure chemical substances. A property of a substance is some distinguishing characteristic. Some of the most common physical properties are color, odor, hardness, density, melting point, boiling point, and solubility in various solvents. For all of these properties, no chemical change takes place. Chemical properties describe the tendencies of a substance to undergo chemical change. For example, copper gets heated in a flame, the surface of the metal turns black. Cooling will not restore it to its natural color. At high temperatures copper reacts with oxygen to produce a new compound, copper dioxide. A chemical reaction takes place on the metals surface. Each new product formed from a chemical change has its own characteristics. So, my hypothesis is that we will see both chemical and physical changes in all of these substances as the experiment happens. Some will have more chemical changes than others, some will have more physical changes. I think they will all have at least some chemical and physical changes. !

!

Procedure: !
1. Half-fill one well of a 24 - well plate with 6 M HCl and half-fill a second well of the 24-well plate with 6 M NaOH. Suck up the chemicals into their labeled pipets for later use. ! 2. Perform the following steps on each of substances being tested. Complete all the tests of one substance and record your observations before going o to the next. ! 3. Place 4 small test tubes into wells of the 24-well plate. ! 4. Place small amounts of the substance to be tested in each of the four micro test tubes. ! First Test Tube: !

1. Examine and record the color and odor. !
2. Light the burner fuel. Grasp the test tube with the holder and heat the sample by moving the substance above the flame slowly. Observe the effect of heat on the substance. Not the evolution of any gases. !

3. Allow the test tube to cool before putting it back in the well. ! Second Test Tube: !
1. Add enough cold water to fill 1/4 of the test tube. Stir wight he glass stirring rod. Observe the solubility of the substance in cold water. !
2. Grasp the test tube and heat the sample by moving it over the flame with the water in it. Gently heat the water just to boiling. Observe the solubility in hot water. ! 3. Tear off about half a centimeter of both red and blue litmus paper/ ! 4. Allow the solution to cool, then using the glass stirring rod, transfer a drop of the solution into both pieces of litmus paper. Record the results and clean the stirring rod. !

!
!
!

Jonah Bluh!
Honor’s Chemistry !
Experiment Number 6 !
November 28, 2014

!

Third Test Tube: !
1. Add a few pipet drops of HCl (hydrochloric acid) to the sample and stir. Use the test tube holder because some reactions are exothermic. Record any apparent reaction or solubility and clean the stirring rod. !

Fourth Test Tube: !
1. Add a few drops of NaOh (sodium hydroxide) to the sample., Stir and record any reaction or solubility. Clean the stirring rod. !
5. Thoroughly clean and ry all 4 test tubes. Repeat steps 2 through 6 with all other substances. !

!
Data/Observations: !
!
!

Solubilit
y

Or

Reaction

Substanc Color
e Name

Odor

Effect of
Heat

Cold
H2O

Hot H2O

Litmus
Test

Dilute
HCl

Dilute
NaOH

Mg

Silver
Color.

None

Slightly
Melted
the
substanc
e, but
that is it.
No
gasses
were
given off.

No
Solubility
in Cold
Water.

Very little
Solubility
in hot
water.

No
change in
Color for
either the
red or
blue
litmus
paper.

Started to
bubble
and
continued
to
bubble. It
became
completel
y soluble
with the
HCl and
it became
one
substanc
e.

When the
NaOH hit
the Mg,
nothing
happene
d. It didn’t
solute
and no
reaction...
Continue Reading

Please join StudyMode to read the full document

You May Also Find These Documents Helpful

  • Physical and Chemical Properties Lab Essay
  • Experiment 4 Physical Chemical Properties Essay
  • Oxidation Reduction Lab and Physical and Chemical Properties Lab Essay
  • Chemical and Physical Matter and its Properties. Essay
  • C121 Lab 4 Physical Chemical Properties Essay
  • Physical and Chemical Change Lab Essay
  • Chemical and Physical Changes Lab Research Paper
  • Chemicals and Properties Essay

Become a StudyMode Member

Sign Up - It's Free
1x90 Dragon Ball Super | Pacific Rim Insurreccion 3D BluRay 3D 1080p | Хищник