What equipment would you need if you were testing t9 see if this antacid dissolved in water faster than other antacids

50 pts plz what is the physical state of matter of baking soda.

How many atoms or molecules are there in a mole of a substance?

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