What is the boiling point of water at 200 torr? 85C 65C 50C 100C exactly What is the external pressure at which water will boil at 80C ? 200 tor 500 torr 450 torr 350 tor What phase change is represented by the heat of vaporization of a substance? The endothermic process of vaporization which changes liquid to gas. The endothermic process of melting which changes solid to liquid. The exothermic pftrlcess of vaporization which changes liquid to gas. The exothermic process of melting which changes solid to liquid. As temperature increases, surface tension increases. True False Question 10(0.75 points) As temperature increases, viscosity increases. True False