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The rate of a reaction increases with increasing concentrations of reactants because you have more collisions occurring in a given time period. The rate of a chemical reaction is inversely proportio
A farsighted person can read printing as close as 25.0 cm when she wears contacts that have a focal length of 44.6 cm. What is the maximum angular magnification that the magnifying glass can provide f
A converging lens (f = 24.6 cm) is used to project an image of an object onto a screen. Find the two object distances
why KF is a better reagent than LiF for the replacement of chlorine in organic compounds by the autoclave reaction
A 1 cm3 air bubble at a depth of 280 meters and at a temperature of 4 oC rises to the surface of the lake, what is its new volume? How many micromoles (to 1 decimal place) of air are in the bubble
the diprotic acid H2B is being titrated against .04M NaOH. H2B has 40mL, .2M concentration, Ka1+2.5*10^-3, Ka2=3*10^-10. What are the concentrations of each species in the following pts in the titra
Consider a container of 2.0 g of hydrogen, H2 (one mole). What electric force do the protons exert on the electrons after they are separated as described
A sample of gas has a mass of 38.7mg . Its volume is 224mL at a temperature of 57 degrees Celsius and a pressure of 868torr . Find the molar mass of the gas.
As a spacecraft approaches a planet, the rocket engines on it are fired (turned on) to slow it down so it will go into orbit around the planet. how long (in minutes) must the engines be fired
Calculate delta H of this reaction. Assume that the total volume is the sum of the individual volumes and the density and specific heat capacity of the solution are the same as for pure water. d for
As a baseball is being caught, its speed goes from 43 to 0 m/s in about 0.003 s. What is the baseball's acceleration in m/s2
A 23.7-g sample of ethylene glycol, a car radiator coolant, loses 906 J of heat. What was the initial temperature of the ethylene glycol if the final temperature is 32.5 degrees Celsius (c of ethyle
Calculate q when 15.8 g of ice is cooled from -22.4 degrees Celsius to -71.0 degrees Celsius (C ice = 2.087 J/g*K)
Three fire hoses are connected to a fire hydrant. Each hose has a radius of 0.017 m. Find the water speed in each hose
Consider titrating 15.0ml of a .245M solution of hydazine, H2NNH2, with a .453M HCl solution. The Kb value for hydrazine is 1.3x10^-6. What volume of HCl needs to be added to the solution in oder to
Perform post hoc comparisons if necessary and what conclusions can be drawn from the F- ratio and the post hoc comparisons?
A hydraulic lift in a garage has two pistons: a small one of cross-sectional area 3.60cm2, If this lift is designed to raise a 3300-kg car, what minimum force must be applied to the small piston
The pH of an aqueous solution containing only a monoprotic weak acid has a pH of 4.1. What is the concentration of hydronium ion, H3O+, in the solution? (a)2 x 10?3 M (b)2 x 10?4 M (c)8 x 10?4 M (d)
A 19.6cm diameter coil consists of 40 turns of circular copper wire 1.7mm in diameter. estimate the current in the loop
Two point charges q = 97.0 nC and q = -97.0 nC are in vacuum located on the x axis at - 17.0 cm, calculate the total electric flux through the y-z plane
If you compare two acids of the same concentration with different Ka values. Which acid solution should have the lower pH value
Liquid benzene, C6H6, (density = 0.877 g/mL) can be used as a fuel. What is ?H in kJ for the combustion of 2.86 L of benzene producing CO2(g) and H2O. Assume that the heat of combustion of benzene i
A 3.6 m long steel wire has a cross-section area of 0.047 cm2. Its proportional limit has a value of 0.0015 times its Young's modulus, What is the maximum weight that the wire can support
The combustion of carbon with excess oxygen forming carbon dioxide is exothermic. C(s) + O2(g) => CO2(g) ?Hrxn = -393 kJ If 9,494kJ of heat is needed from the combustion, how much carbon (g) must
Water is moving at a speed of 7.55 m/s through a fire hose with an internal diameter of 5.99 cm. What is the gauge pressure of water in the hose