5.2.9
- 1. How do physical and chemical properties help identify elements?
- 2. What is recycling of metals and why is it important?
- 3. Why do metals give characteristic flame colors?
- 4. What are flame tests for metals?
- 5. Why are nonmetal oxides acidic?
- 6. Why are metal oxides basic?
- 7. What is nonmetal oxide?
- 8. What is metal oxide?
- 9. How do metals react with sulfur?
- 10. How do metals react with chlorine?
- 11. What are nonmetallic compounds?
- 12. What are metallic compounds?
- 13. Why is helium used in balloons?
- 14. What are uses of noble gases?
- 15. What are uses of chlorine?
- 16. What are uses of sulfur?
- 17. How is hydrogen used as a fuel?
- 18. What are uses of nonmetals in daily life?
- 19. Why is copper used in electrical wiring?
- 20. Why is aluminium used in aircraft?
- 21. What are common uses of metals in industry?
- 22. What are typical properties of transition metals?
- 23. What are actinides?
- 24. Why are lanthanides important?
- 25. What are rare earth elements?
- 26. Why do transition metals form colored compounds?
- 27. What are transition metals?
- 28. What are alkaline earth metals?
- 29. What are alkali metals?
- 30. What are semiconductor materials?
- 31. Why are metalloids used in electronics?
- 32. What is germanium used for?
- 33. What is the importance of silicon in technology?
- 34. What are properties of metalloids?
- 35. What are metalloids?
- 36. Why are noble gases unreactive?
- 37. What are the properties of halogens?
- 38. How do halogens react with metals?
- 39. How do nonmetals react with hydrogen?
- 40. How do nonmetals react with oxygen?
- 41. What is the importance of carbon?
- 42. How does nitrogen form useful compounds?
- 43. What is the role of oxygen in life?
- 44. What are examples of common nonmetals?
- 45. Why do nonmetals form covalent compounds?
- 46. What are chemical properties of nonmetals?
- 47. Why do nonmetals have low density?
- 48. Why are nonmetals generally poor conductors of heat?
- 49. What are the physical properties of nonmetals?
- 50. Why is stainless steel corrosion-resistant?
- 51. What is alloying to prevent corrosion?
- 52. What is painting or coating as corrosion prevention?
- 53. What is galvanization?
- 54. What factors accelerate corrosion?
- 55. What is rusting of iron?
- 56. What is corrosion?
- 57. What properties do alloys improve?
- 58. What is bronze?
- 59. What is brass?
- 60. What is stainless steel?
- 61. What are examples of common alloys?
- 62. Why are alloys used instead of pure metals?
- 63. What is an alloy?
- 64. What is the blast furnace process?
- 65. Why is aluminium extracted using electrolysis?
- 66. What is refining?
- 67. What is smelting?
- 68. What is calcination?
- 69. What is roasting?
- 70. What is concentration of ore?
- 71. What is gangue?
- 72. What is ore?
- 73. What is metallurgy?
- 74. Why are reactive metals stored in kerosene?
- 75. How is the reactivity of metals tested?
- 76. What is meant by electrochemical series?
- 77. Why is gold considered a noble metal?
- 78. Why is gold considered a noble metal?
- 79. Why is potassium more reactive than sodium?
- 80. What is the reactivity series?
- 81. What are the conditions required for rusting?
- 82. What is corrosion?
- 83. What is displacement reaction involving metals?
- 84. Why do some metals not react with acids?
- 85. How do metals react with acids?
- 86. What is the product formed when metals react with water?
- 87. How do metals react with oxygen?
- 88. Which metal is the best conductor of electricity?
- 89. What is meant by high tensile strength?
- 90. Why do metals have metallic lustre?
- 91. Why are metals good conductors of heat?
- 92. Why are metals good conductors of electricity?
- 93. What is ductility?
- 94. What is malleability?
- 95. What are the physical properties of metals?
- 96. What are semiconductors?
- 97. What is the periodic table trend for metals and nonmetals?
- 98. How are elements classified as metals, nonmetals, or metalloids?
- 99. What are metalloids?
- 100. What are nonmetals?