The physical properties of 10 grams of iron are the same as the properties of 20 grams of iron a) reactive b) physical c) chemical

B) Physical. No matter how much of something there is, it is still considered that thing. They still have the same physical properties, just in a higher proportion. A larger amount of something would make it react differently to different catalysts, as well as chemically.

29.1-12=17.1the answer is this one