Homework Answers
Answer - None of them is exothermic and spontaneous.
Melting of ice and melting of ice at 20 degree both are endothermic as they require energy and heat is absorbed.
Dissolution of KF in water is also endothermic as energy is absorbed in this process. It breaks down into Pottasium and fluoride ions.
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Incorrect Question 20 0/5 pts Identify the process which is exothermic and spontaneous. melting of ice...
Which one of the following is an exothermic process? A) ice melting B) water evaporating C)...
Which one of the following is an exothermic process? A) ice melting B) water evaporating C) boiling soup D) condensation of water vapor E) Ammonium thiocyanate and barium hydroxide are mixed at 25 degree C: the temperature drops.
QUESTION 23 Which of the following statements is incorrect? a. A spontaneous process occurs under specified...
QUESTION 23 Which of the following statements is incorrect? a. A spontaneous process occurs under specified conditions without outside intervention. Ob. AGsys --TASuniv c. A nonspontaneous process occurs only if the surroundings continuously supply energy to the system. d. The relationship between AGⓇ and K at 25°C is: if K< 1, AG° <0. e. A spontaneous change may be exothermic or endothermic.
Entropy (S) The second factor involved in determining whether or not a process is spontaneous is...
Entropy (S) The second factor involved in determining whether or not a process is spontaneous is the change in randomness or entropy (AS). Entropy is represented by the symbol S. Again, experience can help us understand the relationship between entropy and spontaneous processes. If we look at the two drawings below, we can predict which picture represents the stack of marbles "before" and after they are bumped. We expect the stack of marbles (less random, lower entropy) to be the...
12)Which one of the following is an exothermic process? A) ice melting B) water evaporating C)...
12)Which one of the following is an exothermic process? A) ice melting B) water evaporating C) boiling soup D) condensation of water vapor E) Ammonium thiocyanate and barium hydroxide are mixed at 25 °C: the temperature drops. 13)Which one of the following is correct? A) V + 2. c B) v + 1-C C) v = ch D) 2 = c v E) v = c 14) The photoelectric effect is A) the total reflection of light by metals giving...
5. Which of the following statements regarding spontaneous changes is false? A. Spontaneity is favored when...
5. Which of the following statements regarding spontaneous changes is false? A. Spontaneity is favored when heat is released. B. Spontaneity is favored when the dispersal of matter is increased. C. Spontaneous changes occur at a given state without any outside influence. D. Ice melting at 25°C is spontaneous primarily due to the increase in molecular disorder (dispersal of matter). E. All exothermic reactions are spontaneous.
please help. thank you Incorrect Question 14 0/5 pts Which of the following salts will be...
please help. thank you
Incorrect Question 14 0/5 pts Which of the following salts will be basic? A. Ca(NO2)2 B.BaF2 C. NHACI D. All of them Oc OD A&B OA 0/5 pts Incorrect Question 7 Which of the following cations will hydrolyze to generate an acidic solution? A. Na+ B. Cat2 C. Sn+4 D. All of them Oc O A&B
1)Reversible processes are generally: A)Exergonic B) Spontaneous C) At equilibrium D) Endergonic 2) Which of the...
1)Reversible processes are generally: A)Exergonic B) Spontaneous C) At equilibrium D) Endergonic 2) Which of the following processes would be considered reversible? A) The digestion of food B) The melting of ice at 0oC C) The vaporization of water at 75oC D) The rusting of iron 3) Which of the following is a statement of the first law of thermodynamics? A) A state of complete order occurs at absolute zero B) A spontaneous process will occur with an increase in...
AS AG 24. (5 pts.) Fill in the blanks with ( +, -, 0 ) for...
AS AG 24. (5 pts.) Fill in the blanks with ( +, -, 0 ) for the value of each situation below: AH endothermic) Less disorder At equilibrium exothermic Same disorder Non-spontaneous adiabatic More disorder Spontaneous 25. ( 5 pts) Uranium (VI) fluoride was sublimed, ionized, and separated to extract U-235 isotope from bulk uranium by an Iranian laboratory. The enthalpies of formation for solid and gaseous UF, are -2137 KJ/mole and -2113 KJ/mole, respectively. The sublimation process is given...
Question 1 5 pts - What is the purpose of melting point? All the answers To...
Question 1 5 pts - What is the purpose of melting point? All the answers To check the purity of solids To check identity of unkown solids To publish for new solids for future characterization Question 2 5 pts How does impurity change melting point value and range? increase-narrowing decrease-narrowing decrease-broadening O increase-broadening Question 3 5 pts What is the reason of an impurity affecting melting point of a solid? Watch Mel. Point Theory video. Not known Obc it weakens...
Which one of the following is an exothermic process? A) ice melting B) water evaporating C) boiling soup D) condensation of water vapor E) Ammonium thiocyanate and barium hydroxide are mixed at 25 degree C: the temperature drops.
QUESTION 23 Which of the following statements is incorrect? a. A spontaneous process occurs under specified conditions without outside intervention. Ob. AGsys --TASuniv c. A nonspontaneous process occurs only if the surroundings continuously supply energy to the system. d. The relationship between AGⓇ and K at 25°C is: if K< 1, AG° <0. e. A spontaneous change may be exothermic or endothermic.
Entropy (S) The second factor involved in determining whether or not a process is spontaneous is the change in randomness or entropy (AS). Entropy is represented by the symbol S. Again, experience can help us understand the relationship between entropy and spontaneous processes. If we look at the two drawings below, we can predict which picture represents the stack of marbles "before" and after they are bumped. We expect the stack of marbles (less random, lower entropy) to be the...
12)Which one of the following is an exothermic process? A) ice melting B) water evaporating C) boiling soup D) condensation of water vapor E) Ammonium thiocyanate and barium hydroxide are mixed at 25 °C: the temperature drops. 13)Which one of the following is correct? A) V + 2. c B) v + 1-C C) v = ch D) 2 = c v E) v = c 14) The photoelectric effect is A) the total reflection of light by metals giving...
5. Which of the following statements regarding spontaneous changes is false? A. Spontaneity is favored when heat is released. B. Spontaneity is favored when the dispersal of matter is increased. C. Spontaneous changes occur at a given state without any outside influence. D. Ice melting at 25°C is spontaneous primarily due to the increase in molecular disorder (dispersal of matter). E. All exothermic reactions are spontaneous.
please help. thank you
Incorrect Question 14 0/5 pts Which of the following salts will be basic? A. Ca(NO2)2 B.BaF2 C. NHACI D. All of them Oc OD A&B OA 0/5 pts Incorrect Question 7 Which of the following cations will hydrolyze to generate an acidic solution? A. Na+ B. Cat2 C. Sn+4 D. All of them Oc O A&B
AS AG 24. (5 pts.) Fill in the blanks with ( +, -, 0 ) for the value of each situation below: AH endothermic) Less disorder At equilibrium exothermic Same disorder Non-spontaneous adiabatic More disorder Spontaneous 25. ( 5 pts) Uranium (VI) fluoride was sublimed, ionized, and separated to extract U-235 isotope from bulk uranium by an Iranian laboratory. The enthalpies of formation for solid and gaseous UF, are -2137 KJ/mole and -2113 KJ/mole, respectively. The sublimation process is given...
Question 1 5 pts - What is the purpose of melting point? All the answers To check the purity of solids To check identity of unkown solids To publish for new solids for future characterization Question 2 5 pts How does impurity change melting point value and range? increase-narrowing decrease-narrowing decrease-broadening O increase-broadening Question 3 5 pts What is the reason of an impurity affecting melting point of a solid? Watch Mel. Point Theory video. Not known Obc it weakens...
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