Water Carbohydrates Electrolytes 68 concentration of carbohydrates and electrolytes Did we prove that our mystery sports drink was beneficial What happened to the liquid in our mystery sports drink ID: 644235
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Slide1
Where’s the Evidence
Check back in your notes… what are the ingredients that make sports drinks beneficial?
Water
Carbohydrates
Electrolytes
6-8% concentration of carbohydrates and electrolytes
Did we prove that our mystery sports drink was “beneficial”?
What happened to the liquid in our mystery sports drink?Slide2
Where’s the Evidence?
One
way to make sure that it
was
water which ‘left’ the sports drink is to capture the ‘evaporate’ and test it!
We
might find it
is pure water, or that it contains other dissolved particles. We might follow a linear path, or it could send us on a detour: “Does this sport drink contain the preferred 92-94% water
concentration?”…
“What really is in this sport drink?”
Either
way is the "road to scientific inquiry".Slide3
One Way to Capture the Evaporate – Solar Water Distiller
Video
Clip: Solar Water Distiller
http://www.youtube.com/watch?v=4sqRvUzqDCE&feature=relatedSlide4
Vocabulary
Commentary:
Do you all know the terms
evaporation
and
condensation
?
Evaporation
is the process of a substance going from a liquid phase into a gaseous phase. Like 'water' into 'steam'.
Condensation
is the process of a substance going from a gaseous phase to a liquid one. Like water vapor (gas) becoming a cloud and then into raindrops
. It is the reverse of evaporation.Slide5
Distillation
Distillation
is a much more involved procedure than
just letting stuff evaporate. The
basic idea is that boiling a liquid produces steam which can be condensed back into a liquid on a colder surface and then collected again.
Impurities
tend to be left behind which is why people buy distilled water at the grocery store. It is useful in coffee-pots or other appliances which could easily be harmed by chorine, fluoride and other impurities if we used tap-water.
This
is
a useful
in our "sports drink" example because we can boil off the 'water', and then collect it without the electrolytes and carbohydrates. We can then test our "distillate" to make sure it really is water and nothing else
.Slide6
Prediction
What do you think the distillate will look like?Slide7
Questions:
What
color is the distillate?
Does
that
surprise you?
What
does the distillate smell like?
Do
you
think
this is pure water or do you think something else is still in the fluid
?
How could we find out?