Which criterion is used to arrange the elements in columns on the periodic table?

What is the number of moles in 9.63 L of H2S gas at STP? 3.54 mol 0.430 mol 0.104 mol 14.7 mol

What is the name of the covalent compound N2O5N2O5?

A parallelogram has side lengths of 4 and 6 and an angle of measure 55°. Law of cosines: a2 = b2 + c2 - 2bccos (A) What is x, the length of the diagonal, to the nearest whole number? 3 5 6 7

4Al + 3O2 = 2Al2O3 In this chemical reaction, how many grams of Al2O3 will be produced if 375 grams of Al react completely?

Navah writes out the chemical equation for photosynthesis. She includes two reacting molecules to the left of the arrow and two resulting molecules to the right.

An analytical chemist is titrating 242.5 mL of a 1.200 M solution of hydrazoic acid HN3 with a 0.3400 M solution of NaOH. The pKa of hydrazoic acid is 4.72. Calculate the pH of the acid solution after the chemist has added 1006.

A gas stream contains 18.0 mol% hexane and the remainder nitrogen. the stream flows to a condenser, where its temperature is reduced and some of the hexane is liquefied. the hexane mole fraction in the gas stream leaving the condenser is 0.0500.

What type of solution is aerated water. why is it so.

What elements form chemical bonds

Which of the following is not a pseudoscientific claim