Question

12 multiple choice 1 point which of the following is a chemical property? mass boiling point reactivity with oxygen color 13 multiple choice 1 point which of these is a clue that a chemical reaction has occurred? condensation of water vapor cutting wood into pieces change in color dissolving sugar in water 14 multiple choice 1 point the following graph shows the relative abundances of the naturally oc

Explanation:

1. Chemical properties describe how a substance reacts with other substances. Mass, boiling - point, and color are physical properties. Reactivity with oxygen involves a chemical reaction, so it is a chemical property.
2. A chemical reaction is indicated by the formation of a new substance. Condensation of water vapor, cutting wood, and dissolving sugar are physical changes. A change in color can be a clue that a new substance has formed during a chemical reaction.

Answer:

1. Reactivity with oxygen
2. Change in color