Suppose you have an unknown mineral sample. you can scratch the mineral with a pen knife but not with your fingernail. the mineral is most likely
a. talc
b. diamond
c. apatite
d. gypsum

Which statement is true according to the kinetic theory? a. molecules of different gases with the same mass and temperature always have the same average density. b. molecules of different gases with the same mass and temperature always have the same average volume. c. molecules of different gases with the same mass and temperature always have the same pressure. d. molecules of different gases with the same mass and temperature always have the same molecular mass. e. molecules of different gases with the same mass and temperature always have the same average kinetic energy.