Chemistry Lab Handout 03       Elements, Compounds & Mixtures

Your Name:    ___________________________________ Role:______________

Lab Partners: ________________Role:_____   ________________Role:_____

Problem:  What are the differences between elements, compounds & mixtures?

Hypothesis:  

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Materials:  15 examples of matter in Erlenmeyer flasks.

Procedure - (always follow these steps in order)

1. Select a sample of matter and bring it to your table to identify.  With each sample, make very careful and detailed observations.  Write these observations in your observation table. 

2. Look carefully on the Periodic Table of the Elements to determine if your sample is on this chart in its own square.

     A. If it is, your sample is an element.  Record element under classification in the classification table and go to step 6.

     B. If it is not, go to step 3.

3. Determine from the label if your sample is made of two or more elements combined in a specific formula.

     A. If it is, your sample is a compound.  Record compound under classification in the classification table and go to step 6.

     B. If it is not, go to step 4.

4. Look carefully at your sample and determine if it is uniformly blended together so that all parts of it look the same.

     A. If it is, your sample is a homogeneous mixture.  Record homogeneous mixture under classification in the classification table and go to step 6.

     B. If it is not, go to step 5.

5. If your sample has uneven clumps of matter it is a heterogeneous mixture.  Record heterogeneous mixture under classification in the classification table and go to step 6.

6. Return your sample to the front lab table and go back to step until you have classified all 15 samples of matter.

Observation Table:  Make careful and detailed observations for each substance in the Erlenmeyer flasks.

Substance	Observations
Air
Aluminum
Cork
Glue
Iron
Polyethylene
Rock
Table Salt
Sugar
Water
Wood
Zinc
Steel Wool
Hydrochloric Acid
Copper(II) Chloride

Data Table:  Write your classification for each sample in this table

Diagram:

 

 

 

 

 

Conclusion: (Was your hypothesis supported or not and how do you know?) _______________________________________________________________________
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Questions:

1.              How many different types of atoms are elements composed of?

2.              What is the difference in the composition of compounds and mixtures?

3.              What is the difference between hetero- and homogeneous mixtures?

4.              What do you think a “pure substance” is?  Give an example of a pure substance.

5.              List 1 example, not used in lab, of each of the 4 types of matter.

Answers:

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4.__________________________________________________________________________
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5. element - _______________________________________________________________

compound - _________________________________________________________________

homogeneous mixture - ______________________________________________________

heterogeneous mixture - ____________________________________________________