LAB 4 Observations of Chemical and Physical Change Part 1

LAB REPORT 4
Observations of Chemical and Physical Change PART 1 – OBSERVATIONS OF CHEMICAL CHANGE

No credit will be given for this lab report if the Data section is not completely filled out and if the required photographs are not received. At least one photograph must show the student’s face.

OBJECTIVES
1. Observe physical and chemical changes.
2. Define physical and chemical change.
3. Identify the relationship between a chemical change and a chemical reaction.
4. Observe several indicators of a chemical reaction.
5. Associate chemical properties with common items (food, household products).

PROCEDURE

Please complete the entire experiment as instructed in the lab manual except for any modifications noted below. Fill out the report below and submit it me electronically via Canvas. Email the digital photographs to me at [e-mail] .

DATA AND OBSERVATIONS (16 points)

You need three digital photographs. At least one should show your face (with safety glasses) as you perform the experiment. Include one photograph from the chemical reaction tests in Data Table 1, one photograph of the food/starch test, and one photograph of the household chemical test.

Data Table 1 – Chemical Reactions

Well
Chemicals
Observations
Chemical Change?

NaHCO3 + HCl
Nothing occurred it remained the same.
No

NaOCl + KI
Observation 1: It turned brown, but had no odor.
Yes

NaOCl + KI + starch
Observation 2: It turned ark purple, but had no odor.
Yes

KI + Pb(NO3)2
It turned bright yellow and formed pieces of solid in the bottom.
Yes

NaOH + phenolphthalein
It had a light odor and turned pinkish red.
Yes

HCl + phenolphthalein
Nothing occurred it remained the same with a slight odor.
Yes

NaOH + AgNO3
It turned greenish brown with clumps of solid with no odor.
Yes

AgNO3 + NH4OH – Observation 1
It turned cloudy white, with no odor.
Yes

AgNO3 + NH4OH – Observation 2
It turned a brownish pink color with no odor.
Yes

NH4OH + CuSO4
It turned dark purple and
Yes