cold fires mrs. luevand’s class first day demo mrs. luevand’s class first day demo
TRANSCRIPT
Cold FiresCold Fires
Mrs. Luevand’s ClassFirst Day Demo
Mrs. Luevand’s ClassFirst 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
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?
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.
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)
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?
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.
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?