Which of the following statements are true?

a. The temperature of a gas sample is independent of the average kinetic energy.

b. There are gas molecules that move faster than the average All the gas molecules in a sample cannot have the same kinetic energy.

c. The average kinetic energy of gas molecules increases with increasing temperature.

d. The average speed of gas molecules decreases with decreasing temperature.

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explanation:

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.