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Air is about 78.% nitrogen molecules and 21.0% oxygen molecules. Several other gases make up the remaining 1% of air molecules.
Maddox takes off on his jet ski so they have a combined mass of 319.86kg. The skis have a thrust of 982.13N, What is Maddox's top speed
Mount McKinley (also called Denali) is the tallest mountain in North America, with a height of 6,200 m above sea level. how much work is done by gravity on the person
Both CsCl and CaF2 exhibit a coordination number of 8 for the cations. What is the structural relationship between these two lattices
What is the pH of a buffer solution of phenol and its conjugate base. [C6H5OH] = 0.11 M and [C6H5O]- = 0.80 M.
What is teh dilution of your unknown, so calculate back to final concentration. And if 1000 ppm is to be used for the serial dilutions (unknown is close to 1 ppm), what standard concentration should
Dario, a prep cook at an Italian restaurant, spins a salad spinner and observes that it rotates 20.0 times in 5.00 seconds, What is the angular acceleration of the salad spinner
Two metal balls are hung from strings. The first ball, 0.14 kg, is pulled to the side and released so that it strikes the second ball with a speed of 1 m/s. What is the mass of the second ball
The pressure in a vessel containing methane and water at 70°C is 10 atm. At the given temperature the Henry's law constant for methane is 6.66 x 104 atm/mole fraction. Estimate the mole fraction
How does a radioactive atom's half-life influence its effect on its environment? Why is it important for chemists to take this into account
Explain how a disaccharide is formed from 2 monosaccharide molecules, hence explaining the difference in the chemical formulae
A coil of wire is connected to an ideal7.00V battery att= 0. Att=10.0ms, the current in the coil is204mA. Find the resistance and inductance of the coil
The sun produces its power from the conversion of mass into energy by Einstein's equation E=mc2 where c=3x10^8 mls. the sun's intensity on the earth is 1346W/m^2, find the rate at which mass is bein
Which of the following anions is the most nucleophilic in an SN2 reaction? A) h2c=ch- B)ch3ch2- C)ch-triplebonds-C A) B B) C C) A
A student added 100 mL of 0.10M NaOH to 250 mL of a buffer that contained 0.15M HC2H3O2 and 0.25M C2H3O2. What is the concentration of HC2H3O2 after the addition of the strong base
sound of a single frequency is sent into the system of pipes, one straight, the other consisting of two semi-circular paths of radii 20cm and 30cm. what is the lowest frequency that produces an inte
Prove that the intersection of any collection of closed sets in X is a closed set and prove that the union of finitely many closed sets in X is a closed set.
You have a solution that is 18.5 (v/v) methyl alcohol. If the bottle contains 1.09 of solution, what is the volume () in milliliters of methyl alcohol
you are given a 5-loop standing wave. The velocity of the wave of the string is v= 10 m/s. What is the frequency of the wave on the string
A circular coil enclosing an area of 200 cm2 is made of 210 turns of copper wire. The wire making up the coil has resistance of 3.0 ?, what is the average current in the coil during that time
Which one of the following is a poor aprotic solvent for an SN2 reaction? A) CH3SOCH3 (DMSO) B) CH3OH C) C6H6 D) CH3COOH E) CH3CN
how come the formula: (change)v / (change)t = (change)x cannot be used for this exercise When a 58-g tennis ball is served, What is the magnitude of the net force acting on the ball
Elementary mercury was first discovered when a mercury oxide was decomposed with heat, foarming mercury metal and oxygen gas. Wehn 0.24-g sample of the mercury oxide is heated, 0.189-g of mercury me
A rescue helicopter lifts a 85 kg person straight up by means of a cable. The person has an upward acceleration of 0.70 m/s2, How much work is done by the person's weight
A carbon-hydrogen compound is burned in an excess of oxygen to give 1.76g of carbon dioxide and 0.900g of water as the products of combustion. What is the empirical formula of the organic compound