AP Chemistry
So... this is the question which is from AP chem 2006 past paper. Suppose that a stable element with atomic number 119, symbol Q, has been discovered. a) write down the ground-state electron configuration of Q, showing only the valence-shell electrons.
math
use the power law of logarithms to verify the product law of logarithms for log10^2
Math
The voltage, V, in volts, applied to an electric circuit can be modeled by the equation V= 167sin (120 pi x) where x is the time, in seconds. A component in the circuit can safely withstand a voltage of more than 120 V for 0.01 s or less. Determine the length of time the volta...
Ionic Crystal Structures
Calculate the density of CsCl. Use 169pm as the radius of Cs+. rCs+= 169pm length= 2*169= 338pm= 3.38*10^-8 v= l^3= (3.38*10^-8)^3 = 3.86*10^-23 m= 2* 168.36 g/mol / 6.022*10^23 = 5.59*10^-24g d= m/v d= 5.59*10^-24g/ 3.86*10^-23 d= 14.48 g/cm^3 BUT the correct answer is 4.24 g...
chemistryyy
I get 8 atom/unit cell and the answer in my book was face centered. But i am a bit confused don't FCC have 4 atoms/unit cell?
Calsius-Clapeyron Equation
P1 DHvap 1 1 ln (---) = ---- (--- - ---) P2 R T2 T1 ln1/0.53= 38/8.31(1/T1 - 1/T2) 2.93 =4.57(1/278 - 1/T2) .641 = 1/278 - 1/ T2 .6407 = -1/T2 T2 = -1.56 that answer is suppose to be T=339 K which part is wrong?
chemistry
it would form a jones reagent
Math (Area)
A pool company will install a round swimming pool in the middle of a yard that measures 40 ft. by 20 ft. If the pool is 12 ft. in diameter, how much of the yard will still be available?: 466.86 ft2 762.32 ft2 686.96 ft2 347.84 ft2
math (mode, median, range)
What are the mode, median, and range of the following set of numbers? 6, 7, 7, 7, 8, 4, 4, 6, 3, 7, 1, 0:
math (percent change)
What is the percent change from 2,100 to 1,890?:
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