How many moles of copper are needed to react with sulfur to produce 0.25 moles of copper sulfide

Which change of state involves a release of energy? boiling condensation melting sublimation

Ammonia gas and oxygen gas react to form water vapor and nitrogen monoxide gas. What volume of water would be produced by this reaction if 6.3L of ammonia were consumed? Be sure your answer has the correct number of significant digits.

A patient needs to be given exactly 1000ml of 15% (w/v) intravenous glucose solution. The stock solution is 35% (w/v). How many milliners of the stock solution are needed to prepare the fluid for the IV bag?

List the ways you can tell that a chemical change has taken place in a substance.

Which pair of atoms should form the most polar bond? A) C and O B) F and B C) F and O D) N and F

The weighted average atomic mass of an element depends upon the a. relative abundance of protons in the element b. mass and relative abundance of each isotope of that element c. mass and relative abundance of each neutron of that element d.

What part of an atom do we change for isotopes

The Safe Drinking Water Act (SDWA) sets a limit for mercury-a toxin to the central nervous system-at 0.002 mg/L. Water suppliers must periodically test their water to ensure that mercury levels do not exceed 0.002 mg/L.

The smallest unit of an element is a blank

How many sodium atoms will create an ionic bond with sulfur?