How many kilojoules are required to heat 0.500 g of water from 20.3 degrees celcius to 29.7 degrees celcius ? how many calories? show your work and watch sig figs.

It is important to wear proper protective equipment in lab even when not actively performing experiments because accidents can affect any researcher, even one not working on an experiment. select the best answer from the choices provided

Which of the following observations indicates that there is a small, dense, positively charged part in the center of an atom? some uncharged particles are scattered by a gold foil. all uncharged particles are attracted towards a gold foil. all positively charged particles pass straight through a gold foil. some positively charged particles bounce back from a gold foil.

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?