Heyyy ik this isnt a dating site but is there any guy that would date a (12,13,14,) that could possibly date a 13 y/o girl

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?

Name the element in group 17, period 2. (periodic table)

To calculate percent by mass, use the equation below: calculate the percent by mass of each element. %n = % %h = % %o = %