Chemistry

Physical and Chemical

Changes Lab

Problem

Will the observed changes be physical or chemical in nature?

Chemical Physical

CombustionNew substance formed

Color change Precipitate

Bubbling/fizzingProduction of heatDisappearance of a metalFormation of liquid droplets

Change in sizeCrush

Break

Change of stateVaporization

Melting

If it can be retrieved by physical means

Hypothesis

Will each experiment be physical, chemical, or both? Explain.

1.2.3.4.5.6.

(Read directions and answer for each!)

Materials

Test Tubes

Test Tube Holder

Test Tube Rack

Tap Water

Salt

Bunsen Burner

Safety Goggles

Apron

Finish Reading the Procedures and Complete the Materials List!!!

ProceduresSee Handout Make sure you staple the procedures to your pre-lab when handing in the lab!Right now – choose who is responsible for:

In a 4 person group:material, experiment, data, procedures!In a 3 person group: materials, experiment, and data/procedures.

Data and Observations

Exp. # Chem. Phys. Obs.

1 Flames, Smoke

2

3 Crushed tablet

4

5

6

Physical Changes

Breaking

Grinding

Crushing

Evaporating

Any other Change of State!

Original substance can be recovered by physical means

Conclusions

Questions on packet#1-5

1. List letters = Phys., chem., or both

2. Narrative Form

3. #1-6, Answer for each “mini” experiment

4. and 5. = Narratives