Examination of Physical & Chemical Properites Data Sheet & Post-Lab Questions PDF

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Lab exam notes and data sheet with post lab questions...

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EXPERIMENT 1 DATA SHEET Table 1: Isopropyl Alcohol Data Measurement

Result

Mass of 100 mL graduated cylinder (g):

39.1 g

Volume of alcohol added to graduated cylinder (mL):

10 ml

Mass of graduated cylinder and alcohol (g):

48.4 g

Mass of alcohol (g):

9.3 g

Calculated density of alcohol (g/cm3):

0.93 g/cm3

Actual density of isopropyl alcohol:

0.790 g/cm3

Experimental error (use equation below):

|0.93 −0.790|

Percent Error=

0.790

17.72

×100=17.72

Table 2: Corn Oil Data Measurement

Result

Mass of 100 mL graduated cylinder (g):

39.1 g

Volume of corn oil added to graduated cylinder (mL):

10 ml

Mass of graduated cylinder and corn oil (g):

48.9 g

Mass of corn oil (g):

9.8 g

Calculated density of corn oil (g/cm3):

0.98

Actual density of corn oil: Experimental error (use equation below):

|0.98 −0.925|

Percent Error=

0.925

0.925 g/cm3

5.95

×100=5.95

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Table 3: Acetic Acid Data Measurement

Result

Mass of 100 mL graduated cylinder (g):

39.2 g

Volume of acetic acid added to graduated cylinder (mL):

10 ml

Mass of graduated cylinder and acetic acid (g):

49.4 g

Mass of acetic acid (g):

10.2 g

Calculated density of acetic acid (g/cm3):

1.02 g/cm3

Actual density of acetic acid:

1.006 g/cm3

Experimental error (use equation below):

|1.02−1.006|

Percent Error =

1.006

1.39

×100 =1.39

©eScience Labs, LLC 2015

POST-LAB QUESTIONS 1. Use your calculated densities to rank isopropyl alcohol, corn oil, and acetic acid from least dense to most dense.

2. What factors could have contributed to your experimental value being different from the actual value?

3. Ice naturally floats on water due to its lower density. If ice did not float on top of water, describe five different ways in which the world would be different.

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EXPERIMENT 2 DATA SHEET Table 4: Physical and Chemical Property Test Results

Powder

Color

Texture

Acetic Acid Effervescence (Yes or No)?

IKI Solution Color Change

Hot Water Effervescence (Yes or No)?

Baking Powder

White

Smooth

No

Purple/Black

No

Baking Soda

White

Fine

Yes

Yellow/Brown

No

Cornstarch

White

Clumped

Yes

Purple/Black

Yes

Unknown

White

Smooth

Yes

Purple/Black

Yes

©eScience Labs, LLC 2015

POST-LAB QUESTIONS 1. Use your results and provide evidence from your Table 4 data of the known substances to identify the unknown powder.

2. Did any of the substances have one minor difference in reaction results? If so, what would you do next to confirm the identity of the unknown substance? Use your results to support your answer.

3. How were all of the known powder substances similar to each other in terms of their physical properties?

4. Describe the difference between a physical change and a chemical change.

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