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How many milliliters of 3.550M H I (aq) must be added to a solution containing .700 mol of Pb(NO3)2(aq) to completely precipice the lead. Lead iodide is virtually insoluble in water so that the reac
When radioactive substance provides a counting rate of 1250 cpm at time t = 0, and a counting rate of around 475 cpm at time t = 20 minutes, determine the half life of the substance.
One curie = 3.7 x 10610 decays per second. The half life of 137Cs is 30 years. When the current activity in such a source is 7.5 micro-curies, determine what will it be in around 15 years?
Determine how many grams of gas are present in a sample the has a mol as mass of 70.0 g/mol and occupies a 2.00L container at 117 kPa and 35.1c?
Determine the mass of the propane in the flask if a 2.00L flask is filled with propane ga (C3H8) at 1.00 atm and -15.0c.
The average counting rate of the radioactive sample is around 486 cpm. Determine the probability that in any given 10 second interval one obtains less than 72 counts. Is this similar as the probabil
Identify the molar mass of the gas measured at the following conditions, 1.05g occupying 2.35L at 37c and 638.4mmHg
A simple harmonic oscillator comprises of 0.80 kg block joined to a spring (k = 200N/m). The block slides on the horizontal frictionless surface around the equilibrium point x = 0 having a total me
100 dollars is to be received after 1 year. Determine present value of the amount if you can earn 12% compounded annually, semiannually, or monthly?
Discuss the arrangement of the following atoms in order of increasing effective nuclear charge experienced by the electrons in the n=3 electron shell: K, Mg, P, Rh, and Ti.
A metal rod having mass m carrying a current I glide on the two horizontal rails a distance d apart. When the coefficient of kinetic friction among the rod and the rails is u what vertical magnetic
Identify the bond order of CH. Would you predict the molecule to stretch or shrink upon (1) ionization, (2) electron attachment, and in each case briefly explain why.
A Gieger counter evaluates 750 counts in 5.0 min. (i) Find out the average counting rate per minute, and the standard deviation of the counting rate, (ii) Determine the fractional error. (iii) Deter
Silver chloride, AgCl, is a sparingly soluble solid. Answer the following questions about a saturated solution prepared by placing the solid silver chloride in a 1.00e-5 M NaCl (aq) solution.
A bicycle tire consists of a diameter of 0.7m. When it rolls devoid of slipping on a road, i) Determine how far will it go if it rotates via 6 complete revolutions?
In 1 or 2 paragraphs, explain how to set up the case control study to look at whether vegetable intake is protective against development of pancreatic cancer? Who would be the cases/controls and how
Determine the molar mass of the acid if 25.0mL of this solution required 11.1 mL of 1.00M of KOH for neutralization. A 5.00g quantity of a dipodic acid was dissolved in water and made up to exactly
An object 3 cm tall is positioned at various locations in front of the concave mirror whose radius of curvature is 30 cm. Find out the location of the image and its features when the object distance
Benzoic acid and Phenol are both weak acids that are insoluble in diethyl ether and insoluble in water. Phenol is soluble only in the stronger base, 10% NaOH. Benzoic acid is soluble in both 10% NaO
An object 3 cm tall is positioned 20 cm from the front of the concave mirror having a radius of curvature of 30 cm. Determine where is the image made, and how tall is it?
What is the pH of a neutral aqueous solution at 50 degrees Celsius when the value of K_w for water at 50 degrees Celsius is 5.48e-14 M^2.
Supposing the femur is 0.680 m long and consists of a radius of around 1.90 cm, by how much is the bone compressed? Illustrate your answer by using two significant figures.
What is the value of Kb for the equilibrium when the pOH of a 0.25 M aqueous solution of an unknown weak base, which we will designate BOH, is 3.10 at 25 degrees Celsius.
What was the pressure in the gs tank during the summer when a gas at 4.5 atm pressure was stored in a tank during the winter at 10c. During the summer temp storage area reached 42.0 c.
A cubical box is around 0.76m on a side. Write down the dimensions of the box as evaluated by an observer moving with the speed of 0.82c parallel to one of the edges of the box?