Scientific models are based on a set of observations. true or false

A rock contains 0.636 mg of 206Pb for every 1.000 mg of 238U present. Assuming that no lead was originally present, that all the 206Pb formed over the years has remained in the rock, and that the number of nuclides in intermediate stages of decay

A 1.00 l sample of water contains 0.0036 g of cl - ions. determine the concentration of chloride ions in ppm if the density of the solution is 1.00 g/ml

How many grams of KCl is produced if 32.4 grams of O2 is produced? 2KClO3 (s) - - > 2KCl (s) + 3O2 (g) Question 2 options: 0.54 grams KCl 6.87 grams KCl 25.7 grams KCl 50.3 grams KCl

Write a sentence that demonstrates kinetic there of matter

What would be the pOH of an HNO3 solution if the [H+] = 3.26 x 10-6 moles/liter?

You might separate a mixture of aniline, p-cresol, benzoic acid, and toluene using ordinary laboratory reagents. 1. dissolving the mixture in a water-immiscible organic solvent - NaHCO3, H2O, CH2Cl2 2.

A chemical element is a pure substance that consists entirely of one type of what

Calculate the mass percent composition of sulfur in Al2 (SO4) 3. Calculate the mass percent composition of sulfur in Al2 (SO4) 3. 28.12 % 42.73 % 35.97 % 9.372 % 21.38 %

What is a striking a match an example of

In any ordinary chemical reaction, matter is neither created nor destroyed; it is simply changed from one chemical substance to another. This principle is called the Law of: