A sample of gas occupies a volume of 725 mL at 825 torr. At constant temperature, what will be the new pressure when the volume changes to the following: (a) 359 mL

(b) 4.94 L

torr

Which of the following is a physical change? a.burning a piece of wood b.sawing a piece of wood in half c.rust forming on an iron fence d.a copper roof changing color from orange to green

How many joules of heat are required to raise thetemperature of 750 g of water from 11.0 °c to 19.0 °c?

An unknown substance is a white solid at room temperature and has a melting point of 78 °c. which of the following substances is most likely to be the identity of the unknown sample? a. naphthalene, a molecular solid with the formula c10h8 b. silica, a network solid held together by covalent bonds with the formula sio2 c. calcium chloride, an ionic compound with the formula cacl2 d. water, an molecular compound with the formula h2o