An atom has 25 protons, 30 neutrons and 25 electrons. what is the charge of the atom's nucleus?

What are the advantages of wind power?

Which is not proof that a chemical change has occurred? the substance melts the color changes a precipitate forms bubbles are produced

The organic compounds that are structural elements in the cell walls of plants and bacteria are known as

Potassium nitrate absorbs a large amount of heat energy from the water as it dissolves. How does this explain the solubility curve you graphed for potassium nitrate?

Is sulfuric acid used to shine jewelry?

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?