A sample of nitrogen gas occupies 5.50 liters under a pressure of 900 mm Hg at 25⁰C. At what temperature will this sample occupy 10.0 liters at the same pressure?

How many protons, neutrons, and electrons are there in a neutral atom of 131i (iodine-131) ?

How much heat is absorbed during production of 112 g of NO by the combination of nitrogen and oxygen? N2 (g) + O2 (g) →2NO (g), ΔH = + 43.0 kcal

The nucleus of which atom contains 48 neutrons

The molar mass of calcium chloride (cacl2) represents the mass of one mole of: A) CaCl2 molecules B) calcium ions and chlorine molecules C) CaCl2 formula units or D) CaCl formula units

Magnetic potential energy is dependent on A. the position of magnetic objects relative to one another. B. the shape and size of a magnet. C. the distance a magnet has moved from its resting position. D.

Calculate the percent yield when 500 grams of carbon dioxide react with an excess of water to produce 640 grams of carbonic acid. CO2 + H2O - --> H2CO3

Which of the following is a possible equivalence that can be used in a conversion? A. ten to the negative second power hL over one L B. ten to the negative second power cL over one L C. ten to the first power L over one daL D.

Which process is a chemical change? burning a match boiling water melting ice breaking glass

What form of matter is "vapor"? a. a solid made of a substance that is usually liquid c. a gas made of a substance that is usually solid b. a liquid made of a substance that is usually gas d. a gas made of a substance that is usually liquid

Which of the following atoms releases more energy than oxygen when an electron is added to its valence energy level? Select one: a. helium (He) b. fluorine (F) c. carbon (C) d. nitrogen (N)