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Unit 8: Chemistry Page 24

explosions …). The chemical-bond blueberries, red and green

energy is converted to thermal grapes, beets, cherries, and
energy (heat) in these turmeric. You can make
experiments. If it feels cold, you’ve indicator paper strips using
made an endothermic reaction paper towels or coffee filters.
(absorbing energy, where the heat Just soak the paper in the
from the mixture converts to bond indicator, remove and let dry.
energy). Sometimes you’ll find that When you’re ready to use one,
your mixture is so cold that it dip it in partway so you can see
condenses the water outside the the color change and compare it
container (like water drops on the to the color it started out with.
outside of an ice-cold glass of
· Use the indicator both before
water on a hot day).
and after you mix up chemicals.
You will be surprised and
Variations for the Indicator:
dazzled by the results!
Red cabbage isn’t the only game in
town. You can make an indicator
Teaching Tips: You can make this
out of many other substances, too.
lab more advanced by adding a
Here’s how to prepare different
postage scale (to measure the
indicators:
solids in exact measurements),
small beakers and pipettes for the
· Cut the substance into smaller
liquid measurements, and data
pieces. Boil the chopped
sheets to record temperature,
substance for five minutes.
reactivity, and acid/base indicator
Strain out the pieces and
levels. (Hint: Make the data sheet
reserve the juice. Cap the juice
like a matrix, to be sure you get all
(indicator) in a water bottle, and
the possible combinations.)
you’re ready to go.

· What different substances can
you use? We’ve had the best
luck with red cabbage,

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