John took two elements X and Y. He filled a small tub with water and dropped both the elements in water and observe the results

The element used by Rutherford duringhis a-scattering experiment.

On a long hike, John drank 7 pints of water. Use the facts to find how much this is in quarts.Write your answer as a whole number or a mixed number in simplest form.

Which two substances are the main elements that make hard water?Group of answer choicesCalciumMagnesiumSodium

Who discovered the principle of water displacement while taking a bath?Group of answer choicesArchimedesEmpedoclesPliny the elderGalen

Professor Boswell calculated the amount of mass in a piece of wood.  He then burned the wood in a container until it was only ashes and gases.  The masses of the ashes and gases combined ___