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Mario is constructing a square dart board. It will consist of a smaller square centered in a larger square. The smaller square measures 4 inches on each side. The ratio of the area of the smaller sq
The minute hand on a watch is 8 mm long and the hour hand is 4 mm long. Express the square of the distance l² between the tips of the hands in terms of the angle Q between the hands.
What is the freezing point of an cyclohexane solution that boils at 81.27 degrees C? Normal freezing point is 6.5 and the normal boiling point is 80.7 degrees C. Kfp = 20.1 K/m and Kbp = 2.79 K/m.
Solve the following system of linear equations: Which one of the following statements best describes your solution:
Cadaverine, a foul smelling substance produced by the action of bacteria on meat, contains 58.55% C, 13.81% H, and 27.40% N by mass; its molar mass is 102.2 g/mol. What is the empirical and molecula
Question: Mrs. Dean wants to paint her mailbox formed by a prysm mounted by a half cylinder. The cylinder's radius is 10cm and it's height is 24cm, the prysms height is 14cm. Determine the total
Calculate the pressure that must be applied to achieve reverse osmosis of 0.504 M NaCl separated by a semipermeable membrane from a solution that is 0.0020 M in NaCl at 22 deg Celsius.
What is the slope of an Arrhenius plot for the following reaction?
A television camera is 30 ft from the sideline of a basketball court 94 ft long. The camera is located 7ft from the midcourt. Through what angle must it sweep in order to cover all the action of th
Which solution would create the higher osmotic pressure (compared to pure water)- one prepared from 1.0g of NaCl in 10 mL of water or 1.0g of CsBr in 10 mL of water?
A 0.115 M solution of an unknown weak acid (HA) has a pH of 2.57. I determined the acid ionization constant (Ka) for the acid to be: Ka = 2.53 X 10-6. What is the weak acid and what is
Question: You are putting a fence around a rectangle garden whose length is three times its width. you use a total of 80 feet of fencing.
A sample of gas changes from P1,V1 and T1 to P2,V2 and T2 by one path and then back to P1,V1 and T1 by another path.Which of following must be zero for the gas in this cycle? ΔT,ΔP
If the initial concentration of N2 was 0.500 M and the concentration of N2 was 0.450 after 0.100 sec, what is the rate of the reaction?
Calculate the heat released when 2.58 L of Cl2(g) with a density of 1.88 g/L reacts with an excess of sodium metal at 25°C and 1 atm to form sodium chloride.
For a hydrogen atom with its electron in the 3p_z orbital, what is the longest wavelength of light that can ionize the atom?
Suppose one triangle is similar to another and the ratio of corresponding sides is r. What can you say about the ratio of the areas? Prove your contention.
Calculated the change in entropy of the copper taking C=24.4j/kmol. The experiment is then repeated with the copper immersed in a stream of water that maintains its temp at 293. Calculate the change
A contractor rented a sander for 5h and a polisher for $50. For another job, she rented the sander for 4h and the polisher for 8h. The rental fees for the job totalled $56. Find the hourly rate char
If 3.35 mL of vinegar needs 44.0 mL of 0.135 M NaOH to reach the equivalence point in a titration, how many grams of acetic acid are in a 1.50 qt sample of this vinegar?
In the lab you determine the molarity of KMnO4 to be 0.08611 M for your first titration and 0.08837 M for your second titration. What is the relative precision for these two trials?
How does the Hammond postulate explain: a. the greater selectivity for bromination vs. chlorination of an alkane?
A 65.0 g sample of zinc (specific heat = 0.0922 cal/g X deg C) was cooled from 100.0 deg. C to 29.4 deg. C in a calorimeter cup containing water initially at 21.5 deg. C. What is the mas of the wat
A triangle has a perimeter of 23 inches. The medium side is 3 inches more than the shortest side, and the longest side is twice the shortest side. find the shortest side.
Calculate the quantity of heat in kJ, associated with a 33.5 degrees Celsius in temperature in a 5.85kg aluminum bar ( specific heat of aluminum= 0.903 J g-1 C-1 )? Please show all work.