5.2 Chemistry
- 101. How do physical and chemical properties help identify elements?
- 102. What is recycling of metals and why is it important?
- 103. Why do metals give characteristic flame colors?
- 104. What are flame tests for metals?
- 105. Why are nonmetal oxides acidic?
- 106. Why are metal oxides basic?
- 107. What is nonmetal oxide?
- 108. What is metal oxide?
- 109. How do metals react with sulfur?
- 110. How do metals react with chlorine?
- 111. What are nonmetallic compounds?
- 112. What are metallic compounds?
- 113. Why is helium used in balloons?
- 114. What are uses of noble gases?
- 115. What are uses of chlorine?
- 116. What are uses of sulfur?
- 117. How is hydrogen used as a fuel?
- 118. What are uses of nonmetals in daily life?
- 119. Why is copper used in electrical wiring?
- 120. Why is aluminium used in aircraft?
- 121. What are common uses of metals in industry?
- 122. What are typical properties of transition metals?
- 123. What are actinides?
- 124. Why are lanthanides important?
- 125. What are rare earth elements?
- 126. Why do transition metals form colored compounds?
- 127. What are transition metals?
- 128. What are alkaline earth metals?
- 129. What are alkali metals?
- 130. What are semiconductor materials?
- 131. Why are metalloids used in electronics?
- 132. What is germanium used for?
- 133. What is the importance of silicon in technology?
- 134. What are properties of metalloids?
- 135. What are metalloids?
- 136. Why are noble gases unreactive?
- 137. What are the properties of halogens?
- 138. How do halogens react with metals?
- 139. How do nonmetals react with hydrogen?
- 140. How do nonmetals react with oxygen?
- 141. What is the importance of carbon?
- 142. How does nitrogen form useful compounds?
- 143. What is the role of oxygen in life?
- 144. What are examples of common nonmetals?
- 145. Why do nonmetals form covalent compounds?
- 146. What are chemical properties of nonmetals?
- 147. Why do nonmetals have low density?
- 148. Why are nonmetals generally poor conductors of heat?
- 149. What are the physical properties of nonmetals?
- 150. Why is stainless steel corrosion-resistant?
- 151. What is alloying to prevent corrosion?
- 152. What is painting or coating as corrosion prevention?
- 153. What is galvanization?
- 154. What factors accelerate corrosion?
- 155. What is rusting of iron?
- 156. What is corrosion?
- 157. What properties do alloys improve?
- 158. What is bronze?
- 159. What is brass?
- 160. What is stainless steel?
- 161. What are examples of common alloys?
- 162. Why are alloys used instead of pure metals?
- 163. What is an alloy?
- 164. What is the blast furnace process?
- 165. Why is aluminium extracted using electrolysis?
- 166. What is refining?
- 167. What is smelting?
- 168. What is calcination?
- 169. What is roasting?
- 170. What is concentration of ore?
- 171. What is gangue?
- 172. What is ore?
- 173. What is metallurgy?
- 174. Why are reactive metals stored in kerosene?
- 175. How is the reactivity of metals tested?
- 176. What is meant by electrochemical series?
- 177. Why is gold considered a noble metal?
- 178. Why is gold considered a noble metal?
- 179. Why is potassium more reactive than sodium?
- 180. What is the reactivity series?
- 181. What are the conditions required for rusting?
- 182. What is corrosion?
- 183. What is displacement reaction involving metals?
- 184. Why do some metals not react with acids?
- 185. How do metals react with acids?
- 186. What is the product formed when metals react with water?
- 187. How do metals react with oxygen?
- 188. Which metal is the best conductor of electricity?
- 189. What is meant by high tensile strength?
- 190. Why do metals have metallic lustre?
- 191. Why are metals good conductors of heat?
- 192. Why are metals good conductors of electricity?
- 193. What is ductility?
- 194. What is malleability?
- 195. What are the physical properties of metals?
- 196. What are semiconductors?
- 197. What is the periodic table trend for metals and nonmetals?
- 198. How are elements classified as metals, nonmetals, or metalloids?
- 199. What are metalloids?
- 200. What are nonmetals?