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a 015 m aqueous solution of the weak acid ha at 250 c has a ph of 535 what is the value of ka for ha
calculate the enthalpy change for the thermite reaction 2alsfe2o3srarr2fesal2o3s deltahrxn-850 kj when 800mol of al
which of the following statements regarding the bohr model of the hydrogen atom is incorrect a bohrs model shows the
a building is 180 feet tall for a class project kari is to make a scale model of the building to place in the front
in a mass production of bolts it is found that 5 are defective bolts are selected at random and put into packet of 10
let g be a group the set autg p g --gt g p is an isomorphism is called the group of automorphisms of g autg is a
what is being asked using the values of the effective molar absorptivities you determined from your slopes and the
in y mx b which value is the slope and which is the y intercept when a linear equation is not given in
joe believes that the relation 213-2455-2 is not a function because two values in the domain have the same range
a 106g frisbee is 18cm in diameter and has half its mass spread uniformly n the disk and the other half concentrated in
a man doing a slow push-up is approximately in static equilibrium his body is horizontal with his weight of 757 n
a 50-kg object is pulled along a horizontal surface at by a 15 n force acting 20 above the horizontala how much work is
a sinusoidal current i icoswt has an rms value of i rms 220 a what is the current amplitude the current is passed
consider a black body of surface area 280 cm2 and temperature 5600 ka how much power does it radiateb at what
suppose a duck lives in a universe in which h 2 j middot s the duck has a mass of 255 kg and is initially known to be
beakers w x y and z contain either aqueous naoh koh lioh or nh4oh which beaker contains aqueous ammonia if the light
calculate the percentage ionization of nitrous acid in a solution that is 0222 m in nitrous acid hno2 and 0278 m in
the kw value decreases and temperature decreases is the auto ionization of water exothermic or
at 280 m below the surface of the sea density 1 025 kgm3 where the temperature is 500degc a diver exhales an air
calculate the quantity of energy produced per gram of reactant for the fusion of -3 atomic mass 3016049 with -1
a certain first-order reaction has a rate constant of 230times10-2 s-1 at 23 c what is the value of k at 55 c if ea 840
what are the theoretical stoichiometric ratios of the reactants used in the condensation polymerization of phthalic
show how to synthesize 2-methyl-2-pentene from an alkyl halide and an aldehyde or ketone plus any other necessary
a cylinder with a piston holds 080 m3 of oxygen at an absolute pressure of 80 atm the piston is pulled outward
a small ferryboat is 400 m wide and 600 m long when a loaded truck pulls onto it the boat sinks an additional 420 cm