Particulates, Concentration and Combining one substance with another.
1. a) A water sample contains 0.0700 grams of arsenic in 10.0L of water. What is the concentration of the arsenic in parts per million (ppm)? 1. b) If a person breathes in 22m3 of air per day and the air contains 0.205 milligrams of particulates per m3 how many grams of particulates does the person breathe in pe ...continues
2. a.) Giving the reason for your answer, which would you expect to have the higher value of pH, a 1.0M solution of the strong acid, HCl or a 1.0M solution of the weak acid, acetic acid, CH3COOH? 2. b.) Why is it that we can say that ozone in the stratosphere is beneficial to mankind, but ozone at the surface of th ...continues
Atmosphere, Atomic weight, and Mass
3. a.) The initial reaction when an automobile airbag deploys is: 2NaN3(s) → 2Na(s) + 3N2(g). If 125.0g of NaN3 reacts, how many liters of N2 gas result at 25.0oC and a pressure of 1.00 atmosphere? 3. b.) The recent death of a former soviet spy is attributed to the effects of an isotope of Polonium with an atomic ...continues
Chemistry - Properties of a Substance T/F
1. True or false: A. When water is added to a solution of an acid the pH does not change. B. A solution of CO2 in water is acidic. C. As the [H+] in a solution increases the pH increases. D. All isotopes are radioactive. E. In a given container the pressure of a gas increases as the temperature increases. F. One func ...continues
Dialysis and protein chemistry
Why do protein chemists us dialysis?
a)A hydrogen nucleus and nucleus of an ‘unknown’ atom are stationery, 5.0 x 10-10m apart. The mass of the hydrogen nucleus is mh=1.7 x10-27 kg and the electric charge of the hydrogen nucleus e=1.6x10-19 c. you may assume that the coulomb constant Ke = 9.0 x109 Nm2 C-2 and that gravitational constant G=6.7 x10-11 Nm2 kg-2. i) ...continues
