Question

match the words in the left column to the appropriate blanks in the sentences on the right.
are formed
during observation a (propane burns), new substances are formed, so the observation
is not consistent
is consistent with a chemical reaction occurring
are not formed
during observation b (acetone evaporates from your skin), new substances are formed, so the
is consistent
observation is consistent with a chemical reaction occurring
during observation c (bubbling occurs as solutions are mixed), new substances are formed, so the
observation is consistent with a chemical reaction occurring
during observation d (heat from an object is felt), new substances are not formed, so the
observation is consistent with a chemical reaction occurring
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Explanation:

Chemical reactions produce new substances; physical changes do not. Propane burning (A) is a chemical reaction (new substances formed, consistent with reaction). Acetone evaporating (B) is physical (no new substances, inconsistent with reaction). Bubbling from mixing solutions (C) often signals gas production (new substance, consistent with reaction). Feeling heat from an object (D) is physical (no new substances, inconsistent with reaction).

Answer:

• Observation A: new substances are formed, observation is consistent
• Observation B: new substances are not formed, observation is not consistent
• Observation C: new substances are formed, observation is consistent
• Observation D: new substances are not formed, observation is not consistent