You have a sample of 30g of uranium-234 and 70g of thorium-230 how old is your sample?

The tendency of water molecules to stick together is referred to as a) adhesion b) polarity c) cohesion d) transpiration e) evaporation

The following transition occurs at a molecular level for a substance. what transition corresponds to this change in microscopic structure? the carbon dioxide molecules on the left are in a regular, tightly packed pattern. after heating, it becomes much lower density. a. melting b. boiling c. sublimation d. freezing

How many moles of sulfur dioxide are in 2.26 × 10^33 sulfur dioxide molecules?