Which two mixtures are homogeneous? D A. Gasoline
B. Apple juice
C. Pie crust
D. Cereal in milk

Dry ice is solid carbon dioxide that is used in the transport of food and medicine. dry ice becomes a gas at –78.5°c without becoming a liquid first.

What is the earliest point in the universe that we can observe? why can’t we see back further than this?

Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.