Which of the following correctly describes a physical change in
matter?
A. matter keeps its chemical makeup, but a
change in size, shape, volume, or state of matter
occurs
B. particles leave and a new substance is made
C. a new substance is formed by atoms
combining in different ways

Asample of tin (ii) chloride has a mass of 0.49 g. after heating, it has a mass of 0.41 g.  what is the percent by mass of water in the hydrate?   %

Butane gas reacts with oxygen gas to give carbon dioxide gas and water vapor (gas). if you mix butane and oxygen in the correct stoichiometric ratio, and if the total pressure of the mixture is 390 mmhg, what is the pressure (in mmhg) of water vapor after the reaction is completed (temperature and volume do not change).

Which of the following is described by the equation h2o(s)+ heat=h2o(i) a freezing melting condensing evaporating