Moles Unit Flashcards
Avogadro’s Hypothesis
a gas law which states that the total number of atoms/molecules of a gas is directly proportional to the volume occupied by the gas at constant temperature and pressure
(same volume of gas = same # of molecules (at same temp and pressure))
how to convert moles to f.u’s
6.02x10^23 / mol
container A has a volume of 22.4L and is filled with H2 gas at STP. container B is also at STP, is filled with steam, and has the same number of molecules as container A. what could you say about the volume and mass of container B
volume will be the same because the two containers have the same number of particles
the mass of container B is greater because water’s molar mass is greater
how to convert moles to grams
g(atomic mass of element) / mol
what is STP
1mol = 22.4L (ONLY FOR GASSES)
The steel wool (gained/lost) mass. So there should be (more/less) matter on the watch glass in the end.
Therefore what is most likely the state of matter of the product? (solids, liquids, or gases)
gained, more, solids
how to convert moles to volume
1 mole = 22.4L of any gas at STP (standard temp + pressure)
what is STP (what temp and pressure)
0 degrees Celsius, 1atm
What will happen to the mass of a wooden splint when it is burned in a Bunsen burner Increase, decrease or stay the same? Give a brief reason for your answer.
the mass of the wooden splint will decrease because the chemical reaction occurring is a combustion reaction and the wood is reacting with oxygen. the reaction forms CO2, water vapor/H2O, and carbon. the gasses produced escape into the atmosphere
What will happen to the mass of steel wool when it is burned in a Bunsen burner? Increase, decrease or stay the same? Give a brief reason for your answer.
the mass of the steel wool will increase because burning steel wool involved a reaction with oxygen, forming an iron oxide. the process adds the mass of oxygen from air to the steel wool.
When the wood burned, a chemical reaction occurred. Since it burned in air, wood reacted with _______ to form new substances.
oxygen
overall reaction for wood
C6H10O5 + O2 = H2O + CO2 + C
The wooden splint (gained/lost) mass. So there should be (more/less) matter on the watch glass in the end. Therefore what state of matter must the new products be? (solids, liquids, or gases)
lost, less, gasses
Steel wool is iron. Is that a metal or nonmetal?
metal
what is the overall reaction of steel wool burning?
4Fe + 3O2 → 2 Fe2O3
