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Pure Substances and Mixtures

Page history last edited by jocelyn 14 years, 11 months ago

Pure Substance and Mixtures

Is Black Marker Really Black?

Experiment Question:

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:

Procedure:

Fill the plastic 400 ml beaker with water 1 cm high
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
Repeat this for the remaining markers, Marks-A-Lot - 2, Crayola - 3, Sharpie - 4, Expo - 5, and Vis A Vis - 6.
This is what it should look like:
Slide the paper towel into the 400 ml beaker so the bottom of the paper towel touches the water. Make sure the water does not Directly touch the numbers when you first place the paper towel in the water!!
Leave the paper towel in the water. You should notice that the paper towel will soak the water and go up the paper towel. The longer you leave the paper towel in the water, Record your observations.

Results/Data Table:

	Pure Substance/ Mixture	Observation
1 - Bic	Pure Substances	stayed the same
2 - Marks -A- Lot	Pure Substances	Stayed the same
3 - Crayola	Mixture	Green, Blue, and Black
4 - Sharpie	Pure Substance	Stayed the same
5 - Expo	Pure Substance	Stayed the same
6 - Vis A Vis	Mixture	Yellow, Brown, Purple, blue and black

Data Analysis;

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

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 82-91 in your textbook)

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

2. Find three examples of a mixture and get an image for each one.

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

Element

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

5. 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	NO	NO	NO
Compounds	YES		YES

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

Summary:

Partner 1 Summary	Partner 2 Summary
I learned if either a marker was a pure substance or a mixture. for einstince a sharpie was a pure substance and a Bic is a mixture cause it shows colors when it is wet and a dry paper cloth. and sometimes it would be green,black, and blue	Today i learned how to find whether a marker is a mixture or a substance. A mixture is when the marker had more than one colors like green, blue, brown etc. And a substance is when the marker has no other color except its own.

Partner 3 Summary	Partner 4 Summary
Today we did experiments on markers to see if they were pure substances or solution. I learned that the crayola isnt really black. It has 3 different colors wich are green, blue, and black.	Today I learned that black marker isnt really black. Like a crayola marker is a mixture. It turned green, blue, and black.

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