When the temperature of a rigid hollow sphere containing 565 L his gas is held at 615 K, the pressure of the gas is 1,755 Kpa. How many moles of helium does the sphere contain?

Which of these is an indication that a chemical reaction has occurred? Select all that apply: melting of a substance boiling of a substance formation of a new gas formation of a precipitate a new smell is given off heat is released

Calculate the ph of a solution in which [oh-]=7.1*10-3m. express the ph of the solution to two decimal places.

4HCl (g) + Si (s) ⇌ SiCl4 (l) + 2H2 (g) would be classified as a (n) :

What happens when an acid reacts with a metal such as magnesium?

Magnesium phosphate formula

Hf is a stronger acid than nh + 4. which base would be stronger: f - or nh3? 1. f - 2. both bases would be equal in strength. 3. nh3 4. cannot tell from the information given. 5. neither f1 - nor nh3 would be bases.

The concentration of commercially available concentrated nitric acid is 70.0 percent by mass, or 15.9 M. Calculate the density and molality of the solution.

Whats 2 properties of iron?

Which light packs the highest energy per photon

Which of the following hydrocarbons will most likely be found around cows?