& Classwork for Biology 8/9 2020 X E Marissa Quilen Mythbusters
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Unit 1 XL Skills
DE XL ldentify steps of the scient
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method
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The passage below describes some of the
steps of the scientific method. Select the
part of the passage that describes
revising the hypothesis.
Time
elapsed
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Hint: To revise the hypothesis, you use the
results of the investigation to come up
with a new explanation and to make new
predictions.
Challenge
Stage 2 of 3
Collect 4
tekens
an icy sidewalk
After a severe ice storm, Hansen wondered how he could melt ice on the
sidewalk. He
had heard that sand, when heated by the sun, could melt ice. So, Hansen got twenty
ice cubes that were equal in weight. He sprinkled sand on half the ice cubes and left
the other half unsanded. He placed all the cubes outside for one hour and then
brushed off the sand and reweighed them. Hansen calculated the average weight of
each type of cube to see if the sanded cubes melted more than the unsanded cubes.
He decided that sand did not speed up melting, since the two types of ice cubes were
similar weights. Then, he read that salt makes ice melt at a cooler temperature. He
predicted that because the melting temperature would be lowered, ice cubes would
melt faster if he applied salt to them.
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