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What's in Crude Oil?

Grades: Grades 6-8
Author: Jim Duxbury,Charlotte Szucs, Sandy Van Natta, and Mary Harris
Source: Phil Dodson from Harlingen, TX for the laboratory distillation idea.


Abstract

Students will be divided into research teams. Each team will research how fractional distillation works, as well as describe one of the major products of fractional distillation. Students will then use distillation to separate 2 liquids. The concept of density will be used. (D=M/V).


Objectives

What should students know as a result of this lesson?

  • Students will learn that fractional distillation is the first stage in processing crude oil into usable products. (The other two stages are: Conversion: cracking and rearranging of molecules, and Treatment.)
  • Students will familiarize themselves with 8 major products of fractional distillation.
  • Students will understand how fractional distillation works and what products are produced. They will become aware of how these products are used in their world.

What should the students be able to do as a result of this lesson?

  • Students will be able to perform a simple distillation of liquids modeling the distillation of crude oil.
  • Students will share, display, and explain specific information gathered in their research.

Materials

  • Per group of students:Computers with Internet access
  • Colored paper
  • Tape
  • 400 mL Beaker
  • boiling stones, marble chips or small sized gravel to make a layer in the bottom of the beaker
  • 50 mL beaker
  • Aluminum foil to make a cover for the 400 mL beaker
  • 10 mL graduated cylindera mixture of 25 mL cooking oil and 25 mL water for each group
  • Hot plate
  • Colored Ice cubes
  • Balance
  • Hot mits

Procedures

Engagement

Have some of the following present in the room for examination: car wax, Vaseline, motor oil, road tar, paraffin, grease, plastic items

Have a discussion about what these have in common. Students may need the Web to look up these substances.The teacher will listen to the class discussion and ask some of the following questions if needed:

  • What type of atoms do these compounds contain?
  • Are these man made or found in nature?
  • Does man makes any of these or what are some of the ingredients to make them?

The goal of the engagement is to have the students come to realize that they all are made from crude oil.

Exploration

Student groups will be given the sheet “The Fractional Distillation Tower” and assigned one specific research topic. Each group should identify crude oil as the source of hydrocarbons, explain the process of fractional distillation, diagram a fractional distillation tower, and describe one of the products of fractional distillation. Each group receives 2 worksheets to guide them in their research.The teacher can move from group to group checking to see if all groups are recording information and actively involved in the research. Asking questions such as the following will check for student understanding:

  • Explain how this tower works.What do you think a hydrocarbon is?
  • What uses can you find for the product you are researching?
  • How does boiling point relate to the position of the component in the tower?

Collecting and viewing the completed worksheets is another way of assessing student work. Looking at the site http://science.howstuffworks.com/oil-refining4.htm has a very nice tower.The high school component on the AGPA Web Site also gives some information and demonstrations about fractional distillation.

Explanation

Students will construct a paper diagram of a fractional distillation tower on the classroom wall (one diagram for the entire class) and place the worksheet of their product at the appropriate location on the tower. The image they found should also be placed on the correct location.

Students will present to the class the information they learned about their product. Students should be encouraged to use diagrams and charts to present their information. A rubric is provided for assessing the group work at this stage. A copy of this rubric should be given to students before they start their research so that they are aware of the grading criteria.

Elaboration

Students will be given a mixture of two liquids: 25 mL water with 25 mL vegetable oil. They can be told that the boiling point of water is 100 °C and that the boiling point of oil is well above 100 °C. They are given a laboratory sheet of directions on how to distill the mixture.

The teacher must approve the distillation set-up and check the students’ density findings at the conclusion of the experiment.

Demonstration: This is in the engagement phase.

Direct Instruction: Set up a model of the distillation apparatus so that students can easily see what they need to do for the Elaboration.

Cooperative Learning: Students work in groups to research information, and distill a mixture of two liquids.

Others: Oral presentations will be used in this learning cycle.


Prerequisites

Skills: Internet Use.

Misconceptions: Students will assume that the mixture will keep getting hotter and hotter as the water boils. They will not expect the temperature to stay steady until almost all the water has been converted to steam. Students may also think that the melted ice cube is dripping through the foil into the beaker.


Best Teaching Practices

  • Cooperative learning
  • Student centered learning
  • Communication of information
  • Relevant application to daily life
  • Hands-on Teaching/Hands-on Learning/Wait Time
  • Following Directions
  • Making Connections
  • Mathematics integration
  • Drawing Conclusions

Alignment with Standards

NGSS Standards:

  • MS-PS1-1 Develop models to describe the atomic compostion of simple molecules and extended structures.
  • HS-PS1-2 Construct and revise an explanation for the outcome of a simple chemical reaction based on the outermost electron states of atoms, trends in the periodic table,and knowledge of the patterns of chemical properties.
  • MS-PS1-3 Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.
  • MS-PS1-4 Develop a model that predicts and describes changes in particle motion, temperature, and state of a pure substance when thermal energy is added or removed.

Common Core Standards:

  • RST.6-8.1 Cite specific textual evidence to support analysis of science and technical texts.
  • RST.6-8.3 Follow preciesly a multistep procedure when carrying our experiments, taking measurements, or performing technical tasks.
  • WHST.6-8.2 Write informative/explanatory texts, including the narration of historical events, scientific procedures/experiments, or technical processes.

National Standards:

  • Science as Inquiry Content Standard A
  • Physical Science Content Standard B
  • Science and Technology Content Standard E
  • Science in Personal and Social Perspective Content F

Ohio Standards:

  • Benchmarks Grades 6 to 8: Physical Science A, B; Science and Technology A; Science as Inquiry A, B; Scientific Ways of Knowing A
  • Grade 6 Content Standards: Physical Sciences 2,4,5; Science and Technology 1; Science as Inquiry 2,3; Scientific Ways of Knowing 3
  • Grade 7 Content Standards: Physical Science 3; Scientific Inquiry 4,6
  • Grade 8 Content Standards: Scientific Inquiry 1,3,4

Content Knowledge

N/A


Safety

Goggles must be worn during the hands-on activity. Caution students that the heated mixture will be extremely hot and should be handled with care. SEE THE LABORATORY DIRECTIONS IN A SEPARATE FILE.


Applications

Crude oil is the source of hydrocarbons such as waxes, oils, and fuels. The products of fractional distillation can also be used as a source for producing today's plastics. Many of the products we use everyday started out as crude oil.


Assessment

N/A


Other Considerations

Grouping Suggestions: Divide your class into 8 groups since there are 8 major distillation products.

Pacing/Suggested Time: Research time will vary based on the availability of computers. Most of the research can be completed in 1 to 2 class periods on the computer. The actual distillation will take one period.


Printable PDF Worksheets

Rubric for Grading

Fractional Distillation Worksheet