What is the charge of an atom's nucleus if the atom has 25 protons, 30 neutrons, and 25 electrons

A piece of hot metal is put into an equal mass of water. The water temperature rises 5o and the metal's temperature drops 10o. What is the specific heat of the metal?

Which has more mechanical energy, a box on the top shelf of a closet or a box of equal mass on the floor? The box on the floor has more mechanical energy because work has been done on it.

Among the following groups of atoms, which have the same outer energy level configurations? a. h, he b. li, be, n, ne c. mg, al, ca, ga d. n, p, as, bi

Which of your isolated compounds is more soluble in pure water? a. both carboxylic acid and hydrocarbon are equally soluble in water. b. the hydrocarbon. c. the carboxylic acid?

Combustion analysis of toluene, a common organic solvent, gives 8.20 mg of co2 and 1.92 mg of h2o. if the compound contains only carbon and hydrogen, what is its empirical formula?

A 3.00 L flexible container holds a sample of hydrogen gas at 153 kPa. If the pressure increases to 203 kPa and the temperature remains constant, what will the volume be?

Measurement of the functions of a nephron reveals a glomerular capillary pressure of 69 mm Hg, and a pressure in the capsular space of 15 mm Hg.

Water is unique because the density of it's solid is less than the density of it's liquid. Describe how life would be different if this weren't true

If an element has 1 valence electrons, how many dots will be in the elements dot diagram?

What is the temperature of a gas at STP?