Which term is used to describe a fact that has always been observed true but could at some future time not be observed as true

Water (2510 g ) is heated until it just begins to boil. if the water absorbs 5.09×105 j of heat in the process, what was the initial temperature of the water?

The number of moles of a given mass of a substance can be found without knowing its molecular formula or molar mass. true false

The appropriate concentration for an iodine sanitizer is