Smells Unit

29
Smells Unit Investigation I: Speaking of Molecules Lesson 1: Cat Food and Stinky C heese Lesson 2: Sniffing Around

description

Smells Unit. Investigation I: Speaking of Molecules. Lesson 1: Cat Food and Stinky Cheese. Lesson 2: Sniffing Around. Smells Unit – Investigation I. Lesson 1: Cat Food and Stinky Cheese. ChemCatalyst. What does smell mean? Write a definition. Why do you think we have a sense of smell?. - PowerPoint PPT Presentation

Transcript of Smells Unit

Page 1: Smells Unit

Smells Unit

Investigation I: Speaking of MoleculesLesson 1: Cat Food and Stinky CheeseLesson 2: Sniffing Around

Page 2: Smells Unit

Smells Unit – Investigation I

Lesson 1:

Cat Food and Stinky Cheese

Page 3: Smells Unit

© 2004 Key Curriculum Press.

Unit 2 • Investigation I

ChemCatalyst

• What does smell mean? Write a definition.

• Why do you think we have a sense of smell?

Page 4: Smells Unit

© 2004 Key Curriculum Press.

Unit 2 • Investigation I

The Big Question

• How do we talk about smells?

The Goal:•To be able to categorize smells.

Page 5: Smells Unit

© 2004 Key Curriculum Press.

Unit 2 • Investigation I

Activity

Purpose: This lesson introduces the study of smell, which runs throughout the unit as a theme. By the end of the lesson you will be acquainted with five different smell categories that are used for identifying and grouping odors. Safety Note: Any student having chronic respiratory problems should not be involved in the smelling portions of these activities. Another student in the group can act as that student’s “nose.”

Page 6: Smells Unit

© 2004 Key Curriculum Press.

Instructions

1. This is a two-part activity. In this first part you will smell a variety of household substances and describe their smells.

2. Record the smells in the following data table in one or two words. Avoid using words like bad, stinky, weird, etc..

3. Copy the following table into your notebook.

Unit 2 • Investigation I

Page 7: Smells Unit

© 2004 Key Curriculum Press.

Unit 2 • Investigation I

Safety Note: In the chemistry laboratory it is NEVER recommended to sniff from a bottle directly, even if a substance is presumed to be safe. It is expected that students will use the wafting technique from now on whenever they are asked to smell anything in a chemistry classroom.

(cont.)

Page 8: Smells Unit

© 2004 Key Curriculum Press.

Unit 2 • Investigation I

• Wafting is a technique of using your hand to draw air over the opening of a container in the direction of your nose. Air mixed with the substance is drawn into your nose so that the smell from the original substances is diluted.

Notes (cont.)

(cont.)

Page 9: Smells Unit

© 2004 Key Curriculum Press.

Unit 2 • Investigation I

Sample Substance Smell Description

1

2

3

4

5

6

7

8

9

10

11

Title: Cat Food and Stinky Cheese Purpose: To become familiar with the 5 different

smell categories.Part I

Page 10: Smells Unit

© 2004 Key Curriculum Press.

Part II

Look at the smell descriptions and group similar smells together. List the numbers of the substances that smell similar.

Record your groupings in your notebook in a new table.

Example:Category 1: Minty Vials: 1, 2

Category 2: Vials:

Page 11: Smells Unit

© 2004 Key Curriculum Press.

Part III

Smell the 5 mystery smells and classify them using your new smell classifications:

Copy this table into your notebook:

Unit 2 • Investigation I

Vial Smell classification

Class consensus

A

B

C

D

E

Page 12: Smells Unit

© 2004 Key Curriculum Press.

Unit 2 • Investigation I

Analysis: Cat Food and Stinky Cheese1. Describe some difficulties that arose in trying to

find works to describe the substances.

2. Was there anything that didn’t smell at all to someone?

3. Into which categories would you put the following smells?

1) banana

2) peanut butter

3) rotten egg

4) shampoo

Page 13: Smells Unit

© 2004 Key Curriculum Press.

Unit 2 • Investigation I

Notes

• Smell classifications are general terms that describe a group of smells.

Page 14: Smells Unit

© 2004 Key Curriculum Press.

Unit 2 • Investigation I

• Putrid is a word that describes things that smell quite repulsive. Dead animal or really old leftovers from the refrigerator smell putrid.

• Camphor is a word used to describe things that smell pungent and medicinal. Camphor is a substance and a word used back in your grandparents’ day. The smell of camphor is quite distinctive. Bengay or Vicks Vapor Rub smell like camphor.

(cont.)

Notes

Page 15: Smells Unit

© 2004 Key Curriculum Press.

Unit 2 • Investigation I

• Sweet smells include things that are flowery and fruity smelling.

• Minty is a green herbal smell that most people are very familiar with and doesn’t usually require explanation.

• Fishy smells are very distinctive and don’t usually require an explanation. Most seafoods smell fishy.

(cont.)

Notes (cont.)

Page 16: Smells Unit

© 2004 Key Curriculum Press.

Unit 2 • Investigation I

Minty Fishy Sweet Putrid Camphor

mint leaves cat food fruit Chapstick Camembert Blistex

Altoids tuna apple tea gym socks Vapor Rub

peppermint tea sardines rose water sweat eucalyptus

Juicy Fruit gum

perfume

(cont.)

Notes (cont.)

Page 17: Smells Unit

© 2004 Key Curriculum Press.

Unit 2 • Investigation I

Vial A Vial B Vial C Vial D Vial E

minty fishy sweet sweet minty

Notes (cont.)

Page 18: Smells Unit

© 2004 Key Curriculum Press.

Unit 2 • Investigation I

Wrap-Up

• Scientists have come up with words to classify smells, which include minty, fishy, sweet, putrid, and camphor.

Page 19: Smells Unit

© 2004 Key Curriculum Press.

Homework: Lesson 1

1. Name two things you have learned about smell so far.

2. Lit the names of 8-10 substances at homes that fit into the 5 smell categories (minty, fishy…)

3. Name 5 substances that do not fit into the 5 categories. What new categories would you put them in?

4. Make a list of 5 things that have no smell.

5. What makes something smell the way it does?

6. Describe a memory that relates to smell. Describe the smell and the memory.

7. How do you think taste is related to smell?

Unit 2 • Investigation I

Page 20: Smells Unit

Smells Unit – Investigation I

Lesson 2:

Sniffing Around

Page 21: Smells Unit

© 2004 Key Curriculum Press.

Unit 2 • Investigation I

ChemCatalyst

• What do you think your nose is detecting when it smells something? What evidence do you have to support your answer?

Page 22: Smells Unit

© 2004 Key Curriculum Press.

Unit 2 • Investigation I

The Big Question

• What does chemistry have to do with smell?

Predict how a molecule will smell based on its molecular formula.

You will be able to:

Page 23: Smells Unit

© 2004 Key Curriculum Press.

Unit 2 • Investigation I

Activity

Purpose: In this lesson you will start to explore the connection between chemistry and smell. You will be given the molecular formula and chemical name of the five mystery substances that you smelled in Lesson 1.

(cont.)

Page 24: Smells Unit

© 2004 Key Curriculum Press.

Unit 2 • Investigation I

Vial Smell Chemical Name Molecular Formula

A minty l-carvone C10H14O

B fishy phenylethylamine C8H11N

C sweet amyl propionate C8H16O2

D sweet isoamyl acetate C7H14O2

E minty menthone C10H18O

Examine this information in order to look for a chemical relationship to smell. Write your predictions in your notebook.

Page 25: Smells Unit

© 2004 Key Curriculum Press.

Unit 2 • Investigation I

Making Sense

• Is there any evidence that smell, molecular formula, and chemical name are related?

Page 26: Smells Unit

© 2004 Key Curriculum Press.

Unit 2 • Investigation I

Notes:Predict what category(s) of smell will include the following chemicals. Write this in your lab notebook by extending your previous data tables. Explain why you put them in those categories.

Vial Chemical

Name

Molecular

Formula

Predicted Smell Actual

Smell

F ethyl valerate C7H14O2

G butyric acid C4H8O2

H ethyl acetate C4H8O2

Page 27: Smells Unit

© 2004 Key Curriculum Press.

Here are the actual smells. Complete your data table.

Unit 2 • Investigation I

Vial Chemical

Name

Molecular

Formula

Predicted Smell Actual

Smell

F ethyl valerate C7H14O2 sweet sweet

G butyric acid C4H8O2 sweet, identical to

vial H,

or different from

the other two

putrid

H ethyl acetate C4H8O2 sweet sweet

Page 28: Smells Unit

© 2004 Key Curriculum Press.

Unit 2 • Investigation I

Check-In

• How would you expect a molecule with the molecular formula C8H16O2 to smell? Explain.

Page 29: Smells Unit

© 2004 Key Curriculum Press.

Unit 2 • Investigation I

Wrap-Up

• Smell appears to be related to molecular formula and chemical name.

• Molecular formula alone is not always sufficient to predict smell because molecules can have the same molecular formula but different smells.