Which physical method can separate a mixture of steel ball bearings and marbles?

boiling
evaporation
filtration
sorting

Explain why pure hydrogen cyanide does not conduct electricity, but become a conductor when it is dissolved in water? (at room temp, pure hcn exists as a volatile liquid)

What is the temperature of one mole of helium gas at stp?

In medium-sized stars such as the sun, nuclear fusion almost always means the fusing of nuclei to form , but larger stars can produce elements as heavy as