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Stretched rubber band Touch the relaxed rubber band briefly to your upper lip. Quickly stretch your rubber band and immediately touch the stretched rubber band to your upper lip again
A small block with mass 0.0525kg slides in a vertical circle of radius 0.0750m on the inside of a circular track. What is the magnitude of the normal force that the track exerts on the block when it i
the reaction: 2C2H6(g) + 7O2(g)-----> 4CO2(g) + 6H2O(g) is exothermic. predict under what conditions of temperature (low, high, all or none) the reaction is expected to be spontaneous
The activity of the antibiotic penicillin slowly decomposes when stored in a buffer at pH 7.0, 298K. The time dependence of the penicillin antibiotic activity
Magnesium is used in lightweight alloys for airplane bodies and other structures. The metal is obtained from seawater in a process that includes precipitation, neutralization, evaporation, and elect
An electrical heater delivers 7.880 kJ of energy (as heat) to a system consisting of the gas inside a cylinder having a movable piston. As a result, the piston moves against a constant external pres
The specific heat capacity of mercury at 25°C is 1.400×10^-1 J/g/K. For a 8.25×10^2 g sample of mercury, how much energy is required to raise the temperature from 22.4°C to 29.4&
Carbon dioxide is removed from the atmosphere of space capsules by reaction with a solid metal hydroxide. Theproducts are water and the metal carbonate
A lake has a pH of 8 and the total molar concentration of nitrogen species (NH3 and NH4+) is 7.1×10-4 mol/L. what is the percentage of aqueous NH3 in the lake
In a titration of HNO3, you add a few drops of phenolphthalein indicator to 50.00 mL acid in a flask. You quickly add 20.00 mL of 0.0414 M NaOH but overshoot the end point, and the solution turns de
The pH of 0.5 M HF is 1.88. Calculate the difference in pH when 6.06 g of NaF is added to 205.7 mL of this solution. Ignore any changes in volume. The Ka value for HF is 3.5 x 10-4.
Based on the values of the standard reduction potentials, predict what happens when adding and write the relevant equations. copper to a 1 M solution of nitric acid zinc to a 1 M solution copper to
The velocity of a 1.30 kg block sliding down a frictionless inclined plane is found to be 1.60 m/s. what is the angle of the plane with respect to the horizontal
A buffer is prepared by mixing 303 mL of 0.146 M HCl with 923 mL of 0.565 M sodium acetate (NaCH3COO). Given that the Ka of acetic acid is 1.8 x 10-5, calculate the pH of the solution.
A pendulum has a length L = 1.11m. It hangs straight down in a jet plane about to take off as shown by the dotted line, Calculate the magnitude of the plane's acceleration
The enthalpy of formation (?Hf) of rubidium chloride is -430.5 kJ/mol. The enthalpy of sublimation for rubidium is 86 kJ/mol, and the first ionization energy of rubidium is 402 kJ/mol. The bond diss
A mass m = 6.100kg is suspended from a string of length L = 1.310m. What is the angle theta between the string and the vertical
An atomic nucleus of mass m traveling with speed v collides elastically with a target particle of mass 2m initially at rest and is scattered an 90 degrees. what angle does the target particle move a
Calculate the pH during the titration of 21.7 mL of 0.451 M KOH with 0.212 M HBr after 18.3 mL of the acid have been added.
An infinitely long line of charge has a linear charge density of 4.50×10?12C/m. How close does the proton get to the line of charge
Calculate the pH during the titration of 20.00 mL of 0.1000 M HCOOH(aq) with 0.1000 M NaOH(aq) after 20.22 mL of the base have been added. Ka of formic acid = 1.8 x 10-4.
A 25.00 kg block starts from rest at the top of a 24.0 m long 30.0° incline. Its kinetic energy at the bottom of the incline is 2940 J. How much work is done by friction
Calculate the pH during the titration of 20.00 mL of 0.1000 M CH3CH2COOH(aq) with 0.1000 M NaOH(aq) after 20.39 mL of the base have been added. Ka of propanoic acid = 1.3 x 10-5.
Find the minimum initial speed of a projectile in order for it to reach a height of 2135 km above the surface of the eartH
Predict the product(s) and write a balanced equation for the following redox reaction: 1. Phosphorous trichloride + chorine