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A charge of 3.0 micro coulombs and a second charge are initially far apart. If it takes 29 J of work to bring them to a final configuration in which the 3.0 micro coulombs is at x = 1.0 mm,
A man pushes a lawn mower on a level lawn with a force of 189 N. If 38% of this force is directed downward, how much time is spent in pushing the mower this distance
If 60.00 mL of water is added to 40.0 mL of 4.00 Molarity NaC1, what will the concentration of the new solution be
A 64 L sample of dry air is cooled from 137°C to -20.°C while the pressure is maintained at 2.85 atm. What is the final volume
Explain the impact of ionic size on the activity coefficient of a species. 1) give the correct trend. 2) give a complete mathematical explanation, 3) give a conceptual explanation.
You make 10-4 M solutions of NaOH and NaHCO3 and a 10-4.3 M solution of Na2CO3. You use pure distilled water that has been fully degassed.
A Venturi meter measures fluid speed in a pipe. A constriction (of cross-sectional area A2) is put in a pipe of normal cross-sectional area A1 (A1 = 2A2). Find the ratio of the flow speeds
In the lab you make 10-5.5 M solutions of HCl and of NaOH using pure distilled deionized water. What would be the pH after the solutions equilibrate with the atmosphere
In a classical model of the hydrogen atom, the electron moves around the proton in a circular orbit of radius 0.053 nm. What is the electron's orbital frequency
A person inhales air richer in O2 and exhales air richer in CO2 and water vapor. During each hour of sleep, a person exhales a total of 300. L of this CO2-enriched and H2O-enriched air. (a) If the p
A sample of an unknown gas effuses in 11.3 min. An equal volume of H2 in the same apparatus at the same temperature and pressure effuses in 2.72 min. What is the molar mass of the unknown gas
A 2030- test rocket is launched vertically from the launch pad. Its fuel (of negligible mass) provides a thrust force so that its vertical velocity as a function of time is given by, What was the in
When 36.6 L ammonia and 39.5 L oxygen gas at STP burn, nitrogen monoxide and water are produced. After the products return to STP, how many grams of nitrogen monoxide are present ............... g N
In a fluorescent tube of diameter 3 cm, 3 times 1018 electrons and 0.75 times 1018 positive ions (with a charge of +e) flow through a cross-sectional area each second
How many grams of phosphorus react with 38.1 L of O2 at STP to form tetraphosphorus decaoxide. P4(s) + 5 O2(g) P4O10(s)
Background: Lake Lianna is fed by two rivers, the Matthew and the Andrew. You have made careful water chemistry measurements throughout the year and found that the two rivers have the following pH a
two rooms, one at 30 degree Celsius and the other at 10 degrees Celsius, Calculate the total power output of lit light bulbs required in the warmer room
Calculate the partial pressure of each gas. PHe = WebAssign will check your answer for the correct number of significant figures. atm PNe = WebAssign will check your answer for the correct number of
Prove that the product of a non-zero rational number and an irrational number is irrational and use a proof by cases to show that for any real numbers a, b and c, rnin(a, min(b, c)) = min(ntirt(a, b),
What functional groups are the key players in a condensation polymerization reaction. How so.
When 0.539 L of Ar at 1.20 atm and 227°C is mixed with 0.223 L of O2 at 501 torr and 127°C in a 400. mL flask at 27°C, what is the pressure in the flask
An archer lines up an arrow on the horizontal exactly dead center on a target as drawn in the figure below. How long was the arrow in the air before striking the target
The hottest temperature yet recorded in Phoenix AZ was 122 dgrees F what is the temperaturein degrees C and K
Dry Sand has a density of 1.5g cm^-3. A child's sandbox measuring 4 ft by 5 ft is filled with sand to a depth of 6 in. What is the mass of the sand in kg. in lb
A 8150 kg sailboat is moving through the waters of the Atlantic. Initially, the boat is traveling at 30 mph, 17 degrees East of North. What is the force of the wind acting on the boat