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A chemist wanted to mixed 6.0 mL of solution A (d=0.82 g/mL) with solution B (d=0.94) so that the final density of the solution was 0.88 g/ml.
The density of an antifreeze solution measured 1.12g/mL. The solution was a mixture of 30% water and 70% antifreeze compound. How many g of antifreeze compound are necessary to prepare 50.0mL of ant
A gas is stores in a spherical tank (v=1.33 pie r^3 cubed) having a diameter of 10.0 ft. An unknown gas is contained in the tank with a density of 0.74 g/L.
A uniform electric field with a magnitude of 680 kV/m permeates a certain volume of space with a total energy of 3.40 μJ. Explain your reasoning for the key steps when you determine the magnetic
The simple interest for certain saving account is jointly proportional to the time and the principal. Write an equation relating to interest,principal, and time
Ethyl acetoacetate will be reacting with trans-chalcone with 25 mLethanol and a pellet of NaOH under reflux for an hour. Then it willbe crystallized with water and chilled on an ice bath for 30minut
You find yourself on the surface of this asteroid and throw a baseball at a speed of 24 m/s. If the baseball is to travel around the asteroid in a circular orbit, what is the largest radius asteroid
The energy from electromagnetic radiation can used to cause the rupture of chemical bond. A minium energy of 209 kj/mole is required to break the nitrogen-phosphorous single bond.
Two identical conducting small spheres are placed with their centers 0.395 m apart. One is given a charge of -12.0 nC and the other a charge of -15.0 nC. (a) Find the electric force exerted by one s
In the Bohr theory of the hydrogen atom, an electron moves in a circular orbit about a proton, assume the radius of the orbit is 5.29 x 10-11 m. (a) Find the magnitude of the electric force exerted
The rate law for a reaction, 2A + B --arrow-- C, is rate = k[A][B]. What is the effect on the rate if the concentration of A is held constant while the concentration of B is doubled?
car weighing 3,210 pounds is on a driveway inclined 20.2 deg to the horizontal. Neglecting friction, find the magnitude of the force parallel to the driveway that will keep the car from rolling down
A current 1.00 g sample of carbon shows 921 disintegrations perhour. If 1.00 g of charcoal from an archeological dig in alimestone cave in Slovenia shows5.50 x 103 disintegrations in 25.2 h, wh
The orbital speeds of the planets are determined to be 42.1 km/s and 56.4 km/s. The slower planet's orbital period is 7.93 years. (a) What is the mass of the star? (b) What is the orbital period of
Using triangles to construct the polygon and an appropriate double-angle formula, determine the formula of the area of the n-sided polygon as a function of R and n, i.e., A = f(R,n).
The mass of a radioactive substance follows a continuous exponential decay model, with a decay rate parameter of 8% per day. Find the mass of the sample after six days.
A simple single lens camera (biconvex lens) is used to photograph a man 1.5 m tall who is standing 5.0 m from the camera. if the mans image fills the length of a frame of film (35mm) what is the foc
Two speakers are driven by the same sound wave of wavelength .50m. if the distances from a point to the speakers differ by 1.0 m, will the waves interface constructively or destructively? Justify yo
For a given sample of CH3OH, the enthalpychange on reaction is 25.8 kJ. How many grams of hydrogen gases are produced?
A projectile is launched with an initial velocity of 80 m/s at an angle of 30º above the horizontal. Neglecting air resistance, what is the horizontal component of the projectile's acceleration
After three years, there is $1816.33 in the account. Find the initial amount placed in the account. Round your answer to the nearest cent.
A lens with an index of refraction of 1.35 is to be coated with a material (n=1.2) that will make the lens nonreflecting for fed light (wavelength = 650nm) normally incident on the lens. What is the
How many a) atoms of oxygen b) formula units of the compound, andc) moles of water molecules are in 4.8 g of epsom salt (Magnesiumsulfate heptahydrate)?
An electron moves with constant velocity through a region of space that is free of magnetic fields. Can one conclude that the electric field is zero in this region?
Suppose also that a sample culture of 1000 bacteria is obtained from this population. Find the size of the sample after three hours. Round your answer to the nearest integer.