We have an aqueous solution of ammonia in equilibrium with water by its K_b expr

Question

We have an aqueous solution of ammonia in equilibrium with water by its K_b expression, What is the effect of adding ammonium chloride to this solution? 1. The pH increases. 2. The concentration of NH_3 increase. 3. The concentration of H^+ increase a. 1 only b. 2 only c. 3 only d. 1 and 2 e. 2 and 3 How do some nuclear reactions produce very very large quantities of energy? a. The energy is given off as electrons relax from one orbital to a lower orbital b. The energy is given off as the electrons excite from an orbital to a higher orbital c. The energy is given off because the reaction gains mass d. The energy is given off because the reaction loses mass e. I he energy is given off as kinetic energy is transformed to heat Thermodynamics can be used to determine which of the following? a. the conditions under which a reaction is spontaneous b. the products of a reaction c. the rate of reaction d. the amount of product left after 10 minutes e. the molecular formula of your reactant All of the following statements concerning entropy are true EXCEPT a. entropy is zero for elements under standard conditions. b. the entropy of 3 gas molecules is greater than 1 gas molecule c. a positive change in entropy denotes a change toward greater disorder. d. the variable used for entropy is S e. the entropy a substance in the gas phase is greater than the solid phase. Predict the signs of delta H and delta S for the evaporation of water at 35 degree C. a. delta H > 0 and delta S > 0 b. delta H > 0 and delta S

Explanation / Answer

14. Answer: D. Beacause the ammonium is not very soluble in water and it has a pH of 11 and the ammonium chloride is acid (pH=4) and it is easy to be soluble in water, so the pH value just downs a little and the concentration of NH3 increases according to the reaction.

15. Answer: C. Because for an example the reaction of soda with mentos, produce more mass in the reaction caused by CO2 and glucose involved so it produce the soda to pop for the mass increase in CO2

16. Answer: B and C. Althouhg every single answer can be possible knowing about thermodynamics the most accurate answer will be is very easy to konow that the the rate reaction and the products form because of the termodynamics.

17.Answer: C. Because all of the principles of the entropy are true but the entropy cannot change toward a greater disorder.

18. Answer: A. The entropy and the anthalpy can increase the temperature between each other.

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