If an objects volume decreases but the mass stays the same why

A neutral atom has 2 electrons in the first energy level and 3 electrons in the second energy level. Which atom is this? Helium Boron Beryllium Carbon

A solution has a hydrogen ion (or hydronium ion) concentration of 3.16 x 10^-9M. what is the pH of the solution

Which of the following correctly describes a reaction that forms a disaccharide from two monosaccharides? Answer Galactose + glucose → lactose Glucose + sucrose → fructose Glycogen + fructose → maltose Maltose + lactose → cellulose

The [H3O+] in a cabernet sauvignon wine is 5.9 ' 10-4 M. What is the [-OH] in this wine?

A 10.0ml sample of calcium hydroxide solution requirewd 26.85ml of 0.225 m hydrochoric acid for neutralization. calculate the nolar concentration of the bsae

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?