Your friend has to plan an experiment for a science fair. he asked for your . his topic is "the strongest cloth for backpacks." what variables must the experinemt include? what variables must be controlled?

Asingle atom of an element has 21 neutrons, 20 electrons, and 20 protons. which element is it? ok o z

C3h8o3 - glycerol major species present when dissolved in water

24. a sports ball is inflated to an internal pressure of 1.85 atm at room temperature (25 °c). if the ball is then played with outside where the temperature is 7.5 °c, what will be the new pressure of the ball? assume the ball does not change in volume nor does any air leak from the ball a) 0.555 atm b) 1.74 atm c) 1.85 atm d) 1.97 atm