How many grams of hydrogen fluoride is required to react with 70 grams of tin?

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

Which statement describes james chadwick’s discovery.

Stage in which a star’s outer layers have started to cool and grow outward?