Cold Fires Mrs. Luevand’s Class First Day Demo Mrs. Luevand’s Class First Day Demo.

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Cold Fires Mrs. Luevand’s Class First Day Demo

Transcript of Cold Fires Mrs. Luevand’s Class First Day Demo Mrs. Luevand’s Class First Day Demo.

Page 1: Cold Fires Mrs. Luevand’s Class First Day Demo Mrs. Luevand’s Class First Day Demo.

Cold FiresCold Fires

Mrs. Luevand’s ClassFirst Day Demo

Mrs. Luevand’s ClassFirst Day Demo

Page 2: Cold Fires Mrs. Luevand’s Class First Day Demo Mrs. Luevand’s Class First Day Demo.

MaterialsMaterialsSafety Attire250mL or 400mL beaker50 mL distilled water50 mL alcoholCrucible tongsLighterDollar bill and paper

towelSalt

Safety Attire250mL or 400mL beaker50 mL distilled water50 mL alcoholCrucible tongsLighterDollar bill and paper

towelSalt

Page 3: Cold Fires Mrs. Luevand’s Class First Day Demo Mrs. Luevand’s Class First Day Demo.

Fiery TheoriesFiery Theories

What happens to an alcohol or other hydrocarbon (methane, sugar,starches, etc.) when exposed to fire and oxygen?

Will a dollar bill burn?

What happens to an alcohol or other hydrocarbon (methane, sugar,starches, etc.) when exposed to fire and oxygen?

Will a dollar bill burn?

Page 4: Cold Fires Mrs. Luevand’s Class First Day Demo Mrs. Luevand’s Class First Day Demo.

The ExperimentThe ExperimentSoak a dollar bill in 50% isopropyl

alcohol and water.Remove it using tongs (grab the

dollar bill in center, hold it in horizontal position).

Move the dollar bill into the flame of the Bunsen burner or lighter.

Leave it in the flame for only a second than take it out of the flame.

Soak a dollar bill in 50% isopropyl alcohol and water.

Remove it using tongs (grab the dollar bill in center, hold it in horizontal position).

Move the dollar bill into the flame of the Bunsen burner or lighter.

Leave it in the flame for only a second than take it out of the flame.

Page 5: Cold Fires Mrs. Luevand’s Class First Day Demo Mrs. Luevand’s Class First Day Demo.

QuestionsQuestionsAlcohol burns and the

dollar bill is fine. Why?

What is the $1 made of, and why is this significant?

Why doesn’t the paper catch fire? (explain thoroughly)

Alcohol burns and the dollar bill is fine. Why?

What is the $1 made of, and why is this significant?

Why doesn’t the paper catch fire? (explain thoroughly)

Page 6: Cold Fires Mrs. Luevand’s Class First Day Demo Mrs. Luevand’s Class First Day Demo.

Questions ContinuedQuestions Continued

Why is it better to use 50% isopropyl alcohol than 70% isopropyl alcohol?

Why add salt to the alcohol and water mixture?

Why is it better to use 50% isopropyl alcohol than 70% isopropyl alcohol?

Why add salt to the alcohol and water mixture?

Page 7: Cold Fires Mrs. Luevand’s Class First Day Demo Mrs. Luevand’s Class First Day Demo.

Now What?Now What?

Fold up a paper towel, using tongs to hold the paper towel, soak it in 50% isopropyl alcohol.

Remove the paper towel, light it using a Bunsen burner by putting it into the flame for only a second than take it out of the flame to see it burn over the sink.

Fold up a paper towel, using tongs to hold the paper towel, soak it in 50% isopropyl alcohol.

Remove the paper towel, light it using a Bunsen burner by putting it into the flame for only a second than take it out of the flame to see it burn over the sink.

Page 8: Cold Fires Mrs. Luevand’s Class First Day Demo Mrs. Luevand’s Class First Day Demo.

Drawing ConclusionsDrawing Conclusions

Is there a difference between burning the $1 bill soaked in alcohol and the burning paper towel soaked in alcohol? Why

What conclusion can be drawn from this implication?

Is there a difference between burning the $1 bill soaked in alcohol and the burning paper towel soaked in alcohol? Why

What conclusion can be drawn from this implication?


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