Q 4/5

gas mixtures are homogeneous because of the….

random motion of particles

gases are compressible because of the….

large spaces between the particles

gas pressure is caused by….

collisions of particles with the walls of the container

more collisions equal….

more pressure

Pressure and Volume are ____ related

inversely

T and V are ____ related

directly

T and P are ____ related

directly

PV=nRT units

atm, L, moles, .08206, K

at STP, one mole of ideal gas equals….

22.4 liters

gas pressure and number of moles are ____ related

directly

molar mass equals….

dRT/P

density units

g/L

the more molar mass a gas has, the ____ it moves at a given temperature

slower

temperature equals…..

average kinetic energy

gases at the same temperature have the….

same average kinetic energy

when collecting a gas by water displacement….

P(total) = P(dry gas) + P(water vapor)

real gases behave most like an ideal gas at….

high temperature and low pressure

the more polar and larger a gas is, the more it will….

deviate from ideal behavior

what gases are the most ideal?

small, nonpolar gases

delta H for exothermic reactions are….

negative

exothermic reactions feel ___ because….

hot because heat is a product and temperature goes up

delta H for endothermic reactions are….

positive

endothermic reactions feel ____ because….

cool because heat is a reactant and temperature goes down

delta H for bond energies

bonds broken - bonds formed (reactants - products)

breaking bonds is….

endothermic

forming bonds is….

exothermic

delta H normally is….

sum of delta H(products) - sum of delta H(reactants)

if a reaction is exothermic, the bonds formed in the products are ____ than the reactant bonds

stronger and more stable

if a reaction is endothermic, the bonds formed in the products are ____ than the reactant bonds

weaker and less stable

if you double a reaction, delta H will….

double

if your reverse a reaction, delta H….

changes sign

if you are adding reactions, delta H is….

added