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A yellow compound dissolved in methylene chloride is added toa chromatography column. The elution is begun using petroleum ether as the solvent.
What is the rate constant for the first order decay of acertain radioactive isotope if the concentration drops from 0.50Mto 0.050 M in 1.0 years?
A mixture of NaCl and sucrose (C12H22O11) of combined mass10.2g is dissolved in enough water to make up a 250ml solution. The osmotic pressure of the solution of the solution is 7.32 atm at250C. Cal
The freezing point depression constant for water is -1.86 ?C/m. If 5.00 g Na2SO4 is dissolved in 45.0 g H2O,the freezing point is changed by -3.82 ?C. Calculate the van't Hofffactor for Na2SO4
Tarzan swings on a 33.0 m long vine initially inclined at an angle of 39.0° with the vertical. (a) What is his speed at the bottom of the swing if he starts from rest?
A 17.0 kg child on a 3.00 m long swing is released from rest when the ropes of the swing make an angle of 26.0° with the vertical. (a) Neglecting friction, find the child's speed at the lowest p
Calculate the pH after 0.120 g ofsolid NaOH is added to 150 mL of this buffer solution.c. If the acceptable buffer range of the buffer solution is ±0.10 pH units, calculate how many moles
How far from the edge of the counter does the cat land? What is cat's velocity when it lands on the counter?
Q1. A balloon is electrosatically charged with 3.4 uC (microcoulombs) of charge. A second ballon 23 cm away is charged with -5.1 uC of charge. the force of attraction/repulsion between the two charg
What volume will a sample of hydrogen occupy at 270.2 K ifthe gas occupies a volume of 2.23 liters at a temperature of 0.0oC? Assume that the pressure remains constant.
Heavy metal azides, which are salts of hydrazoic acid,HN3, are used as explosive detonators. A solution of0.10 M hydrazoic acid has a pH of3.36. What is the Kafor hydrazoic acid?
What is/are the equation that you begin with and how are the boundary conditions applied to them in order to get to a calculable equation for fundamental frequency?
A neon atom emits light at many wavelengths, two of which areat 616.4 and 638.3 nm. Both of these transitions are to thesame final state.
A particularrefrigerator cools by evaporating liquefied chlorodifluoromethane,CCL2F2. How many kilograms of this liquidmust be evaporated to freeze a tray of water at 0' C toice at 0' C?
The highest note on a viola (a musical instrument which is a member of the violin family) is found on the A string, which has a fundamental frequency of 440 Hz. The tension of this A string is 128
Gerardo tosses a ball straight up. Neglecting air resistance, which of the following choices best describes the forces acting on the ball after it leaves gerardo's hand but before it reaches its pea
Wonder woman stopped a villain's bullet with her goldmetal wristband. The bullet was traveling with a kineticenergy of 52.6 joule when it hit the wrist band.
Calculate the velocity of the mass when it has traveled a distance x = 0.120 m along the friction surface.
48.69 g of zinc metal is heated in a dry test tube in aboiling water bath to 99.95 °C. The hot zinc metal is then dropped into 98.55 g of water at 20.65 °C in acalorimeter.
The closely packed cones in the fovea of the eye have a diameter of about 2 micrometers. For the eye to discern two images on the fovea as distinct, assume that the images must be separated by at le
Cholesterol is an important constituent of eukaryotic cell membranes and affects the fluidity of the membrane. Consider the structure of cholesterol and suggest how it might be orientated in the mem
Why is a large steriod molcule such as oestrone able to cross the cell membrane when a smaller molecule such as adrenaline can not?
A charge of +9q is fixed to the corner of a square while a chage of -8q is on the diagonally opposite corner. What Charge (in terms of q) should be put at the corner so that the potential is 0 at th
If 7.48 g of a particular gas occupies 250mL at a temp of 28.4 degrees C and a pressure of 623 torr, then the elemental composition of this gas is 30.45%N and 69.55% O by mass.
A cylindrical conductor with radius a carries a current with a current density kr^2. a) Find the total current in the conductor.