Which particle is emitted when an atom of 85Kr spontaneously decays?

(1) an alpha particle (3) a neutron

(2) a beta particle (4) a proton

A 10 mL sample of HCl solution was transferred by pipet to an Erlenmeyer flask and then diluted by adding about 40 mL of distelled water. What is the approximate H3O + concentration and pH of the solution in the flask before the titration begins?

What is the number of neon for the periodic table

Which statements are true of all scientific endeavors? Check all that apply. All scientific endeavors are time consuming. All scientific endeavors are expensive. All scientific endeavors are supported by evidence.

A gas sample contained in cylinder equipped with a moveable piston occupied 300.0 mL at a pressure of 20.0 atm. what would be the final pressure if the volume were increased to 500.0 mL at constant temperature?

In the chemical reaction: Br2 (g) + Cl2 (g) ⇌ 2 BrCl (g) KP = 0.150 If there is initially 0.500 atm of BrCl and nothing else in a container, what direction does the reaction move:

If we have 22 molecules of sodium sulfate in water, how many sodium ions will be observed in solution?

Sodiun atom, potassium atom, and cesium atoms have the same?

A molecule is what?

How many electrons in an atom could have these sets of quantum numbers n=7 l=3 ml=-1?

The reaction A+B-> C+D rate=k[A][B]^2 has an initial rate of 0.0810 M/s. What will the initial rate be if [A] is halved and [B] is tripled? What will the initial rate be if [A] is tripled and [B] is halved?