An element is a pure substance that is defined by the number of protons in which is defined as the atomic number

Calculate the vapor pressure of a solution containing 27.2 g of glycerin (c3h8o3) in 132 ml of water at 30.0? c. the vapor pressure of pure water at this temperature is 31.8 torr. assume that glycerin is not volatile and dissolves molecularly (i. e.

It is not possible for a solid substance to change directly to the gas phase true or false

Select the correct answer. How does activation energy affect a chemical reaction? A. It increases the energy of the reactants. O B. It determines how difficult it is to start the reaction. c. It determines how much product can form. D.

Low ionization energies are most characteristic of atoms that are

Two different gases are stored in separate closed containers. If both gases have a temperature of 50 degrees celcius, which statement is true? The thermal energies of gas molecules in the two containers are unrealted.

Which statement describes the redox reaction that occurs when an object is electroplated? A. It is spontaneous and requires an electric current. B. It is spontaneous and produces an electric current. C.

How are electromagnetic different than all other waves

Find the ratio of speeds of an electron and a negative hydrogen ion (one having an extra electron) accelerated through the same voltage, assuming non-relativistic final speeds. Take the mass of the hydrogen ion to be 1.67*10^{-27} kg.

A type of rock that undergoes changes because of heat and pressure

How many milliliters of a 1.25 molar HCL solution would be needed to react completely with 60 g of calcium metal Ca+2HCl - - > CaCl2 + H2