Choose the option below that is true of temperature changes. a. Increasing the temperature of an exothermic reaction will cause the system to shift toward the reactants. b. The internal energy of a system increases as temperature decreases. c. Temperature changes do not affect exclusively gaseous chemical systems. d. Temperature changes affect the reaction quotient but not the equilibrium constant.

The true statements are:

Explanation:

According to Le Chatelier's principle, any disturbance caused in an equilibrium reaction will tend to shift the equilibrium in a direction away from the disturbance.

So, when we increase the temperature of an exothermic reaction then more and more heat will liberate as disturbance on the product side will increase. Hence, the equilibrium will shift towards the reactants.

Also, change in temperature will lead to change in solid, liquid and gaseous system.

Therefore, we can conclude that out of the given options true statements are:

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.