Select all of the statements that are true. 1. The average kinetic energy of the particles in a substance determines the

substance's temperature.

2. If the particles in two pure substances have the same average speed, the

substances can have different temperatures.

3. When two substances have the same temperature, all of the particles in

both substances are moving at the same speed.

4. How fast a substance's particles are moving determines how hot or cold

the substance is.

The element that has the greatest electronegativity is

What is the molar mass of ca(cio4)2

The two naturally occurring isotopes of chlorine are 35cl (34.969 amu, 75.77%) and 37cl (36.966 amu, 24.23%). the two naturally occurring isotopes of bromine are 79br (78.918 rm amu, 50.69%) and 81br (80.916 amu, 49.31%). chlorine and bromine combine to form bromine monochloride, brcl. 1. how many peaks will be present in a mass spectrum for brcl? the four combinations of molecule possible given these four isotopes are: 81br37cl, 81br35cl, 79br37cl, and 79br35cl. 2. what are the masses of the four different brcl molecules? express the masses using six significant figures, in decreasing numeric order (highest to lowest), separated by commas.