How many uranium atoms are there in 6.1 g
of pure uranium? the mass of one uranium
atom is 4 × 10−26 kg.

Which is a chemical property of iron? a. it forms iron oxide (rust) when exposed to moisture and air. b. it is a gray–black metal that is hard to the touch. c. it has a melting point of 2795°f (1536°c). d. it is a good conductor of heat

What does the symbol (–hfus) indicate in a phase change?

How does a large body of water, such as the ocean, influence climate?