42.You are likely to observe 11-boeding in whick of following molecules? a. subs

Question

42.You are likely to observe 11-boeding in whick of following molecules? a. substrate b. mask c. counter layer d retardant b. CH.F G. NaF 37. When a liquid reaches a temperature at which its vapor pressure is equal to one atmosphere, the liquid bas reached is a. sublimation point b) normal boiling point c evaporation point d mel 38. Which of the following substances has the highest boiling poisnt? 43 A chemical reaction that transfers heat from the system (the reaction) to the surroundings is always ra endothermic b. electrically charged are or exothermic d, spontancous cakr - 153.2 44 A hungry engineering student reaches for a favorite granola bar whale working on a statics assignment. If the granola bar contains 240 "calories" (food calorie - Ikcal), how much energy is consumed if the bar is eaten? C. CH. d. CH.Cl 39.Which of the following substances represents an excellent conductor of electricity? a 3.1 10J b, 1.0 × 10-1 c1 103 d. 2.6 10J b. zinc c. silicon d. iodine 45. A new alloy is designed for use in a car radiator. the 17.6 kg radiator required 8.69 x 10J of beat to warm from 22.1°C to 155.8°C, what is the specific hea of the new alloy? 40 Which pair of atoms is most likely to be involved in H bonding a. Hand CI a 1.70 Jig'c b. 0.00491g C b. H and IF C. Na and H d. Al and H d 0.365 JigC 41.Which term best describes the unoccupied band above the valence band? 46.Given the following heat of formation values, calculate the heat of reaction for: a. conduction band b. induction band AH, values in kJ/mol for: Na(s) -0, Na(g) -108.7 Clg)-0, NaCls)- -411.0 a. +519.7 kJ c. Pauling's band d. passive motion band

Explanation / Answer

39.C.Silicon is a semiconductor

40.B. H and F. Only fluorine ,oxygen and nitrogen show hydrogen bonding with H.

41.A.Conduction band

42.HF.Same as reason in 40.

43.C.Exothermic.

44. C. 1kcal equals to 5184 Joule.therefore 240kcal is equal to 4184*240.

45.D.q=mst.

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