Why does a closed system mean that nothing could enter or exit

Number of representative particles in 0.250 mol silver

Valence electrons are the ONLY electrons that are involved in bonding. A. True <- - I believe this is correct. B. False

Draw 2-methylpentanoic acid. include the hydrogen atoms in your structural formula.

Why are metals flexible?

Which must be the same when comparing 1 mol of oxygen gas, O2, with 1 mol of carbon monoxide gas, CO? the mass the volume the number of molecules the number of oxygen atoms

What mass of potassium chlorate would contain 40grams of oxygen?

Identical forces act for the same length of time on two different masses. The change in momentum of the smaller mass is A) smaller than the change in momentum of the larger mass, but not zero. B) zero.

How many nuclei of 238 92 U 92 238 U remain in a rock if the activity registers 290 decays per second? (Note that the half life of Uranium-238 is 4.468x109 years)

A base can neutralize an acid. true or false

Hydrochloric acid (12.0 ml of 0.233 m) is added to 296.0 ml of 0.0579 m ba (oh) 2 solution. what is the concentration of the excess h + or oh - ions left in this solution?