If cobalt metal is mixed with excess sulfur and heated strongly, a sulfide is

produced that contains 55.06% cobalt by mass. Calculate the empirical

formula of the sulfide.

How many moles is 3.27x10^23 molecules

Which characteristic of water allows its molecules to form hydrogen bonds?

How does waste filtered by kidneys leave the body? A) It leaves through breath as humans exhale. B) It leaves through the skin as sweat. C) It leaves through the urethra as urine. D) It leaves through the nose and mouth as excess mucus

A balloon with a volume of 1 L is filled with a gas that has a pressure of 4 Pa. What is the new pressure of the gas if the balloon is squeezed down to a volume of. 6 L? (Boyle's Law, pg. 79) SHOW WORK

How much heat will be released when 10.0 g of hydrogen peroxide decomposes according to the following reaction: 2H2O2 (l) 2H2O (l) + O2 (g) ΔH = - 190 kJ A. 26 kJ B. 22 kJ C. 28 kJ D. 24 kJ

Why doesn't water light on fire? It has all the ingredients except heat! Hydrogen for the flammability factor, oxygen so it can keep burning, and all you need to do is add heat and BOOM you have a flame! 15 pts

The type of social bonds present in modern societies that are based on difference, interdependence, and individual rights is called:

The difference between ionic covalent and metallic bonding

As the speed of a particle increases, does its associated wavelenght increase or decrease

The composition of air by volume is approximately 1/5 oxygen, 4/5 nitrogen. When air is passed through red-hot carbon, the following reaction occurs: 2C + O2 (g) 2CO (g).