a graduated cylinder has 25ml of water placed in it. an irregularly shaped rock is then placed in the graduated cylinder and the volume of the rock and water in the graduate cylinder now reads 50mL. the mass of the rock is 18g. calculate the density of the rock.

What is the mass of sodium in 3 moles of sodium chloride

Which statement is true about a catalyst? a: a catalyst decreases the rate of the reaction. b. a catalyst is consumed during a chemical reaction. c. a catalyst lowers the activation energy of a reaction. d. a catalyst increases the reactant concentration during a reaction.

Before it was launched, a helium-filled balloon had a pressure of 201 kpa at a temperature of 27°c. at an altitude of 15,000 m, the pressure had decreased to 2.5 kpa and the temperature had dropped to -14 °c. the volume of the balloon increased to 59.3 m3. what is the original volume of the balloon? 13 m3 0.85 m3 0.077 m3 1.17 m3