What is the definition for the word theory

Three solutions are mixed together to form a single solution; in the final solution, there are 0.2 mol pb (ch3coo) 2, 0.1 mol na2s, and 0.1 mol cacl2 present. part a what solid (s) will precipitate? express your answer as a chemical formula.

What is the isotope notation for an element with an atomic number of 92 and 143 neutrons?

What is the change in enthalpy when 9.75 g of aluminum reacts with excess ammonium nitrate according to this equation: 2Al + 3NH4NO3 = 6H20 + Al2O3. H = 2030 kJ

Which one of these salts will form a basic solution on dissolving in water? A. NaCl B. KCN C. NaNO3 D. NH4NO3 E. FeCl3

Potassium nitrate has a lattice energy of - 163.8 kcal/mol and a heat of hydration of - 155.5 kcal/mol. How much potassium nitrate has to dissolve in water to absorb 113 kJ of heat?

Balance the following redox equation in acidic solution using the smallest integers possible and select the correct coefficient for the H + (aq) ion.

Toussaint L' ouveeture lead a revolt that eventually resulted in Independence for

If a solution contains 1 x 106 hb molecules, how many o2 binding sites are available? if the solution of hb is 50% saturated with o2, how many binding sites are occupied by o2?

A. what are isotopes? b. how are the isotopes of a particular element alike? c. how are they different?

The line of longitude used as the origin in a system of coordinates