If 18.75 mole of helium gas is at 10oC and gauge pressure of 0.350 atm. (a) Calculate the volume of the helium gas under these condition and (b) calculate the temperature if the gas is compressed to precisely half the volume at a gauge pressure of 1.00 atm.

Which statement describes the phase change that occurs when dry ice is placed in an open container at room temperature?

One similarity and one difference between an element and a mixture of elements

Bridget is in science class. her teacher gives her two unknown substances and asks her to determine their relative ph. she places a piece of red litmus paper into both substances. the litmus paper turns purple when she places it into substance i. the litmus paper turns blue when she places it into substance ii. a. substance i is a neutral substance and substance ii is an acid. b. substance i is a neutral substance and substance ii is a base. c. substance i is an acid and substance ii is a base. d. substance i is a base and substance ii is a neutral substance.