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31. Qualitative analysis shows that water is made up of hydrogen and oxygen.

32. In May engineers found a leak in a hydrogen fuel line.

33. Water can be reduced to oxygen and hydrogen by electrolysis.

34. A molecule of water consists of two atoms of hydrogen and one atom of oxygen.

35. The whole system is rich in hydrogen gas.

36. This allows hydrogen bonds to reform.

37. Abrasions are sprayed with hydrogen peroxide. Sentencedict.com

38. Truman ordered the development of the hydrogen bomb accelerated.

39. Figure 9.9 shows the measured phase-diagram of molecular hydrogen.

40. The palladium cathode was charged with dissolved hydrogen.

41. Treatment is aimed at decreasing hydrogen ion loss.

42. Hydrogen is a highly flammable gas.

43. The easiest method of producing hydrogen from water is by means of electrolysis.

44. In spite of the situation we find ourselves in[sentencedict.com], maybe hydrogen bombs aren't the biggest cause for concern.

45. They plan to pump a suspension of catalysts in steam and air or hydrogen, down into a coal seam.

46. The smallest ilmenite grains, which have the highest concentration of hydrogen, are the hardest to liberate from other minerals.

47. The equation of state of molecular hydrogen at high pressures and temperatures is particularly important and yet it is poorly known.

48. Fuel cells, which provide electricity generated by a chemical reaction between hydrogen and oxygen, constitute one part of that research.

49. The timing of active hydrogen ion secretion, however, remains unknown.

50. This is a symbol expressing hydrogen ion concentration in a solution; it is a measure of relative acidity or alkalinity.

51. Proton concentrations for each sample were then calculated from the hydrogen ion activity and the combined sodium and potassium concentrations.

52. Thus, this mission is so demanding that we are forced to use liquid hydrogen as the propellant.

53. If after four hours no such a rise in breath hydrogen occurred, the transit time was recorded as 240 minutes.

54. With energy supplied by sunlight, some water vapor in the upper atmosphere may have broken down to hydrogen and oxygen.

55. What had started out as a quest for metallic hydrogen now became a serious hunt for fusion.

56. The vaporized gasoline is processed into hydrogen, water and carbon dioxide.

57. Then it is combined with hydrogen in a catalytic converter to produce methane gas and water.

58. Until recently, such wavelengths have been ignored because neutral hydrogen absorbs it in the same way fog absorbs visible light.

59. Vent water is enriched in reduced chemical compounds, especially hydrogen sulfide.

60. One of the hydrogen atoms in ammonia is replaced by a benzene ring.