1. Boiling water and producing water vapor II. Freezing liquid water into ice cubes
III. Mixing salt into a beaker of water until the salt dissolves
IV. Combining hydrogen gas and oxygen gas in a way to make liquid water
When a chemical change occurs something new is formed. The reactants have different properties than the products. The
product cannot easily be separated into its original parts.
of the four examples listed above, which describe a chemical change?
A)
B)
IV
III
C
D)
II.

Astudent sees several ants walking up a wall following the exact same trail that an ant took earlier. she wants to apply the scientific method to determine how the ants detected the trail. which of these steps would come first in her application of the scientific method? perform an experiment by cleaning the scent away from part of the trail. draw a conclusion that the ants follow a scent trail. make a prediction about what the ants will do after she cleans away part of the trail. hypothesize that the ants are following a scent trail that the first ant left.