Fatima completed a lab activity by mixing aqueous solutions of lead(II) nitrate and sodium iodide. Fatima noticed the appearance of a precipitate once the solutions were mixed.
The incomplete skeleton equation for the reaction is
Pb(NO3)2 (aq) + Nal (aq)
Pbl, + NaNO3
17.
The lowest whole number coefficients to balance the above equation would be

In a water molecule, hydrogen and oxygen are held together by a(an) bond. a) double covalent b) ionic c) nonpolar covalent d) hydrogen e) polar covalent

For a research project, a student decided to test the effect of the lead(ii) ion (pb2+) on the ability of salmon eggs to hatch. this ion was obtainable from the water‐soluble salt, lead(ii) nitrate, which the student decided to make by the following reaction. pbo(s) + 2 hno3(aq) → pb(no3)2(aq) + h2o losses of product for various reasons were expected, and a yield of 86.0% was expected. in order to have 5.00 g of product at this yield, how many grams of pbo should be reacted? (assume that sufficient nitric acid, hno3, would be used.)

What is the energy in joules of a mole of photons associated with visible light of wavelength 486 nm?