A student working in the laboratory produces 6.81 grams of calcium oxide, Cao, from 20.7 grams of calcium carbonate, CaCO3, according to the reaction CaCO3 + CaO + CO2. Calculate the theoretical yield and
the percent yield for the reaction. Show and/or explain your work.

Harvey kept a balloon with a volume of 348 milliliters at 25.0˚c inside a freezer for a night.  when he took it out, its new volume was 322 milliliters, but its pressure was the same.  if the final temperature of the balloon is the same as the freezer’s, what is the temperature of the freezer? the temperature of the freezer is  kelvins.

Which supports the idea that birds and butterflies both have wings but they do not have a common ancestor with wings? a. the wings are analogous structures that evolved differently and do not have a similar internal structure. b. the wings are homologous structures that evolved differently and do not have a similar internal structure. c. wings of birds are vestigial structures, but the wing structures of bats are not vestigial. d. wings of bats are vestigial structures, but the wing structures of birds are not vestigial

Areader can tell that the meaning of “obnoxious” will include “having the quality of something” because of the .a) prefix b)pronunciation c)suffix d) word root