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Pure substances and Mixtures

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Pure Substance and Mixtures

Is Black Marker Really Black?

 

Experiment Question:

  • What is the difference between a mixture and a pure substance?

 

Definitions:

  • Pure Substance: A substance in which there is only ONE type of particle
  • Mixture: A combination of two or more substances that are not chemically combined.  

 

Materials:

  • 400 ml plastic beaker
  • Paper towel
  • Water
  • 6 Black Markers

Procedure:

  1. Fill the plastic 400 ml beaker with water 1 cm high

  2. With the Bic marker, write the number 1 on the left side of the paper towel. Make sure the number is 2 cm above the bottom of the paper towel

  3. Repeat this for the remaining markers, Marks-A-Lot - 2, Crayola - 3, Sharpie - 4, Expo - 5, and Vis A Vis - 6.

  4. This is what it should look like:

  6. Slide the paper towel into the 400 ml beaker so the bottom of the paper towel touches the water. Make sure the water never touches the numbers!!

 

 

This is what it should look like:

       
 

Results/Data Table:

 

Pure Substance/ Mixture
 

Observation

1 - Bic

Pure substance

The number did not change very much and stayed black.

2 - Marks -A- Lot

Pure substance

The number did not change and stayed black.

3 - Crayola

mixture

The number turned blue as the water went up.

4 - Sharpie

Pure substance

The color stayed the same.

5 - Expo

Pure substance

The color went lighter but did not change much.

6 - Vis A Vis

mixture

The number changed into a rainbow.

 

Data Analysis;

1. Looking at your observations, how did you tell if the marker was a mixture or a pure substance?

 

You can tell if the color changes into a color different than the color it was before.

 

Material

Description

Pure Substance or Mixture?

Charcoal

Does not separate into different substances when melted

pure substance

Salt Water

Separates into salt and water when it is boiled

Mixture

Air

Separates into different gases (nitrogen, oxygen, hydrogen)

mixture

Aluminum

When heated aluminum does not separate into different substances

pure substance

Paper

When cut, separates into smaller pieces of paper

pure substance

Brass

Separates into different metals

mixture

 

Other Notes: (use pages 82-89 in your textbook)

1. Find three examples of a pure substance and a mixture and get an image for each one.

  Pure Substance Mixture
Example 1:Brass
wood
Example 2:
grass
juice
Example 3:
Aluminum
juice

2. What are the two types of Pure Substances? and Define both types of Pure Substances.

Suspension and solution

3. Elements are divided into 3 categories.  Name the three.

Metals, non-metals and metalloids.

4. Complete the chart below

  Can it be broken down into smaller, simpler substances? Can it be broken down by a Physical Change? Can it be broken down by a Chemical Change?
Elements
 Yes No Yes
Compounds
      

Related Links: Find 3 related, educational, and informational links from the web

 

http://chemsite.lsrhs.net/Intro/Pure_vs_mixtures.html

http://www.armoredpenguin.com/wordsearch/Data/2009.03/2010/20100835.329.html

http://chemheritage.org/scialive/julian/activities/7a.html

Summary: Your summary should include:

 

  1. A description of what you did in this experiment.
  2. Answer the experiment question, which is stated at the top.
  3. Be at least 4 to 5 sentences.
Partner 1 Summary
 Partner 2 Summary
In this small lab we worked on pure substanses and mixtures . We tested out  6 markers to see if they were really black we grabbed the paper paper towel and put it on water to see if they stayed black or eventually changed and had an affect of mixture the result came out to be that the Crayola brand & Vis-a-Vis had an affect of mixture when it had contact with  water the colors mixed up and fade away leaving a  messy mark behind While the other 4 brands stay exactly the same even if it has contact with water and by that they are pure substances.
Today we did a lab on pure substances and mixtures. We tested out 6 markers on a paper towel to see if they were pure substances or mixtures. We dipped the paper towel in water and saw that the Crayola and Vis-a-Vis markers got mixed and faded and messy colors when it contacted water. The other 4 brands staed exactly the same making them pure substances.

Partner 3 Summary
 Partner 4 Summary
During today's lesson our objective was to find out which of the six black markers we were given were mixtures and which were pure substances. First we wrote down the numbers on a paper towel. Next we filled up a container 1 cm high. Then we put the towel into the container. Finally we watched as the water slowly rose up the paper towel. Our observations were that the 3rd and 6th numbers were mixtures and that all the others were pure substances. Both 3 and 6 turned into a condensed rainbow. In the end this proved to be an enjoyable expirement.  

 

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