Which of the processes is exothermic?

a. evaporation of alcohol

b. sublimation of iodine

c. solidification of volcanic lava

d. burning of paper

50 pts plz what is the physical state of matter of baking soda.

What causes most sediment to wash or fall into a river

To prevent the presence of air, noble gases are placed over highly reactive chemicals to act as inert "blanketing" gases. a chemical engineer places a mixture of noble gases consisting of 4.37 g of he, 13.36 g of ne, and 36.65 g of kr in a piston-cylinder assembly at stp. calculate the partial pressure in torr of kr.