The atomic number of an element is always the same as ___

A. The number of electrons

B. The number of protons

C. The number of neutrons

D. The number of protons plus neutrons

Calculate the vapor pressure (in torr) at 298 K in a solution prepared by dissolving 42.4 g of the non-volatile non-electrolye urea {CO (NH2) 2} in 195 g of ethanol. The vapor pressure of ethanol at 298 K is 58.9 torr.

When an acid reacts with a base what compounds are formed? a. a salt only. b. water only. c. a salt and water. d. metal oxides only.?

Where is the isotope located on an atom

Which term describes the movement if water molecules in and out of a cell

Excessive fishing and encroachment may lead to: improvement expansion extinction thermal pollution

The density of an aqueous solution of nitric acid is 1.36 g/ml and the concentration is 2.48 m. what is the concentration of this solution in percent by mass?

In a crystal lattice of an ionic compound, A. Kind of a given charge are clustered together B. Ions are surrounded by ions of the opposite charge C. A sea of electrons surrounds the ions D. Neutral molecules are present

Discuss why two objects of made of the same type of matter at the same starting temperature with different masses increase in temperature at different rates when the same amount of thermal energy is transferred to each object.

An isotope contains 56 protons, 54 electrons, and 74 neutrons. What is the identity of the isotope?

How many ozone particles are needed to form 24 particles of oxygen gas?