Question

A process results in the formation of a gas as energy is absorbed. Which statement correctly classifies the change that is taking place?

A. The change is ambiguous, because the evidence can result from either a chemical or a physical change.
B. The change is a physical change whenever the formation of a new substance is not specified.
C. The absorption of energy can only occur during a chemical change.
D. The formation of a gas is evidence that a chemical change must have occurred.

Answer 1

@aaronq

Answer 2

hmm formation means a new substance formed, usually. so it can't be physical

Answer 3

so C is the answer?

Answer 4

nope, energy absorption can also occur in physical processes, like melting ice

Answer 5

oh.. right so then it's D! thank you! :)

Answer 6

yes it is! no problem