In the early 1700s scientists understood the composition of air.

Balance HCN+CuSO4"H2SO4+Cu (CN) 2

Sulfur (S) has 16 protons and 16 neutrons. How many electron shells does an element of sulfur have?

Two 20.0-g ice cubes at - 11.0 °C are placed into 205 g of water at 25.0 °C. Assuming no energy is transferred to or from the surroundings, calculate the final temperature, Tf, of the water after all the ice melts. Heat capacity of H2O (l) = 75.

How does the octet rule relate to ion formation? A) The octet rule states that atoms form ions in an effort to acquire electron configuration permanence.

The experimental density of CO2 gas at 0.1 MPa and 300K is 0.001773 g/cm3. a) What is the experimental concentration (in M units) and number density (molecules/m3 units) of CO2 gas at 0.1 MPa and 300K

True or False? The fatal 1930 incident in Muese Valley, Belgium, was associated with leakage of toxic chemicals from a former dump site.

How many moles of neon (Ne, 20.179 g/mol) are in 68.4 grams of neon

A 50.00 mL sample of groundwater is titrated with 0.0300 M EDTA. Of 12.40 mL of EDTA is required to titrate the 50.00 mL sample, what is the hardness of the groundwater in molarity and in parts per million of CaCO 3 by mass

Why openness is important to the progress of science?

At a certain temperature the rate of this reaction is second order in NH4OH with a rate constant of 34.1 M^-1s^-1: Suppose a vessel contains NH4OH at a concentration of 0.100M.