Which of the following is a polyatomic ion?

O A N₂

B. HCl

O C. S2

O D. PO43-

How many electrons does hydrogen need to satisfy the octet rule?

Which phase change is an example of an exothermic process?

What is the function of a vesicle, sometimes called a vacuole, in a animal cell?

Which radioisotope is a beta emitter? (1) 90Sr (3) 37K (2) 220Fr (4) 238U

What is the molality of a solution containing 4.0 moles of solute in 3.2 kg of solvent? Round to the nearest tenth. Don't forget the units.

When balancing a chemical equation, the number of h atoms in 2 ch4 is eight?

What would be the total mass of the products of a reaction in which 25 grams of table salt decomposes into the elements sodium and chlorine?

The nucleus of a Helium atom has a charge equal to twice the proton's charge. Let FN denote the magnitude of the force the Helium nucleus exerts on one of the electrons in a Helium atom, and let Fe denote the magnitude of the force one electron in

What can you say about the past four decades?

Calculate the percent yield for the reaction above if 25.0 grams of H2SO4 was actually produced and the theoretical yield was predicted to be 42.0 grams. (% yield = Actual / theoretical x 100) SO3 (g) + H200 H2SO4 (9) O 59.5 O 168 O 0.595 O 1.68