36. hat is approximate pH of ammonia? the 37. Nitrogen has complete its valence

Question

36. hat is approximate pH of ammonia? the 37. Nitrogen has complete its valence five s in its valence shell. How many electrons does it need to gain to shell? seven b, three c. two d eight e. One 38. Nitrogen has five electrons shell. How many electrons doesit need to gain to complete its in its valence valence shell? a. Eight b. Two c. Three d. One e. Seven 39. Glucose and are because they have identical molecular formulas but their atoms are arranged fructose a geometric isomers b enantiomers c. structural isomers d polar e. tertiary 40. Sugar dissolves readily in water because it is a ny substance. a hydrophobic b. adhesive c 41. Which is a benefit of sexual reproduction over asexual reproduction? a. Evolution will occur at a slower rate when there are two parents b. There is less variation from be generation to generation. c. The offspring are all identical to the parents. d. More offspring can produced e. The interaction of the genes from both parents brings about genetic variation 42. The difference between a hexose and a pentose is that a, a hexose can be polymerized, but a pentose cannot b. a hexose always has six hydroxyl groups, and a pentose always has five. c. a bexose is saturated, and a pentose is undersaturated. d. a hexose always has six carbons, but a pentose always has five carbons. e. a hexose is hydrophilic, and a pentose is 43. What is the ultimate source of genetic variation within a population? a. Mutations in DNA b. Adaptation of a species to environmental changes c. A system of locomotion that allows an organism to escape environmental changes d A sensory system that can detect an environmental change e Homeostatic mechanisms that compensate for environmental changes 44. Which of the following choices correctly identifies a reactant in the following chemical equation? co, H20 H2CO monoxide b. sugar c. oygen d. carbonic acid e. water 45. How many molecules are present in one mole of CH,2o? a. 6.02 x 102 molecules b. 17 x10 molocules o. 17 10 "molocules d. 1.3 x 1010 molecules e, 24 molecules 46. Which one of the following is a characteristic of asexual, as opposed to sexual, reproduction? a, formation of a fertilized egg b. high degree of genetic variation c a cell splitting in half d. genes contributed by two parents e. fusion of egg and sperm 47. Chlorine has seven electrons in its valence shell. The number ofel it must gain to complete its valenc electrons a. two. b. seven. c. one. d. three. e. eight. 48. Which of the following atoms would most likely be involved in an ionic bond? a hydrogen oxygen. b. sodium c. hydrogen d hydrogen and sodium

Explanation / Answer

36. e. 11.

Because it is moderately basic.

37. c. two

Because it needs 7 electrons altogether

38. b. two

39. c. structural isomers.

Because both the molecules have the same molecular formula and different structural arrangement.

40. d. hydrophilic

Because hydrophilic substances have affinity to water making them dissolve easily.

41. e. The interaction of the genes from both parents brings about genetic variation.

42. d. hexose have six carbons, but a pentose always have five carbons

43. Mutations in the DNA

44. e. water

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