A ship is sailing at a speed of 5 km/hr. What distance has it covered, 2 hours after it left the port?​

Using the periodic table, complete the following. element: hydrogen symbol: h₂ molecular weight: g mass of one mole: g/mol

How much energy is required to vaporize 2 kg of copper? a 4730 kj b 207kj c 9460 kj d 414kj

An is a pure substance that can’t be broken down into simpler substances by chemical or physical means