At stp, which element is melleable and a good conductor of electricity? a- xenon b- silicon c- platinum d- hydrogen

How do scientists think that gravity affected the formation of our solar system?

If a molecule with a molecular formula of c13h18 is treated with an excess of h2 in the presence of finally divided pt metal under conditions required for maximum hydrogenation of the molecule to give a molecule with a formula c13h24, how many rings are in the molecule?

If you burn 46.6 g of hydrogen and produce 416 g of water, how much oxygen reacted