Calculate the enthalpy of the reaction h2 (g) f2 (g) → 2hf (g) using bond enthalpies and compare this value to the result obtained by using the standard enthalpies of formation.

What does the "ii" in the name iron (ii) indicate about the cation?

Which of the following best describes the velocity of an object? a.) 30m/s b.) 30m east c.) 30m/s east d.) 30m? s^2

Which of the following is correct abbreviated si unit describing the amount of a substance A mol B kg C g D m

What volume of 0.200 M HCl will react with 0.2500 g of CaCO3? CaCO3 (s) + 2 HCl (aq) ➔ CaCl2 (aq) + H2O (l) + CO3 (g).

A container with a specific volume "V" changes to "2V." What happens to the average distance between gas molecules? Assume that pressure and temperature of the gas remain constant.

Major geological events that occur when plates shift suddenly and released stored energy: A. Volcanic eruptions B. Earthquakes C. Antarctic plate D. Spreading ridges

How does a salt bridge improve a battery

Hat information is needed to determine the energy of an electron in a many-electron atom?

Write the formulas for the following compounds: (a) copper (l) cyanide, (b) strontium chlorite, (c) perbromic acid, (d) hydroiodic acid, (e) disodium ammonium phosphate, (f) potassium dihydrogen phosphate, (g) iodine heptafluoride, (h)

Name a complex salt used in silver-playing.