Chemistry Lab on Classification of Matter
Introduction:
In chemistry, as in all the sciences, it is very important to be able to classify substances. One way substances are classified is as a pure substance or a mixture. Pure substances are further classified as elements or compounds. Mixtures are further classified as homogeneous or heterogeneous. In this lab you will identify substances by observing their physical properties. You will also determine how to separate the substance, if it can be separated, by chemical or physical means.
Objective:
To differentiate between classifications of matter
Pre-lab:
On your own piece of notebook paper, define the following words in complete sentences for homework:
Matter
Mixture
Pure substance
Homogeneous mixture
Heterogeneous mixture
Element
Compound
Atom
Molecule
Procedure:
1. Place your pre-lab definitions on your desk and leave them there while completing the lab.
2. There are 20 numbered stations around the room that correspond to the numbers on your lab paper.
3. The name of the matter has been typed in the space provided for the corresponding number.
4. Place check marks (√) in the columns that apply to that matter. There will only be one check for the state of matter. Choose from pure substance or mixture, and then choose only one under that category. Choose only one way to separate the substance, or neither if it cannot be separated by physical or chemical means. (Hint: there are only 3 checks per row)
5. A bell will ring to tell you when to move to the next number, with no talking. You will have about one minute for each numbered station.
6. Answer the questions on the pre-lab paper when you are done with all the stations.
7. Make sure your name is on all papers and turn them all in before the end of class.
Questions to be answered after completing the lab, using the back of the pre-lab homework paper.
1. State and describe two methods that might be used to separate a mixture. Use complete sentences.
2. Using a square to represent the container, draw an example of a solid, a liquid, and a gas. Be sure to label the squares. Use small circles to represent the particles.
3. Identify each of the following as an element, compound, or mixture from these pictures. (label)