题目

从对话后的选项中选择适当的句子补全对话。A: Wasn't that a great talent show?B: Yeah!A: B: Oh, I thought Eliza was the best. She's an excellent piano player.A: Yeah, she was great. B: Me too! I couldn't stop laughing! A: Yeah, I'd say she was the most creative actress! I don't know many people who can play the guitar upside down!B: A: Oh, Dennis! He was terrible! He can't juggle at all!B: I know!A: B: Well, they were definitely the loudest!A. Who did you think was the worst?B. And I thought Steve and his dog were the funniest.C. Who did you think was the best actor?D. What di钠是一种非常活泼、具有广泛应用的金属。（1）钠的原子结构示意图为，钠在反应中容易___电子（填“得到”或“失去”）。（2）金属钠非常活泼，通常保存在________里，以隔绝空气。（3）汽车安全气囊的气体发生剂NaN3可由金属钠生产。某汽车安全气囊内含NaN3、Fe2O3和NaHCO3等物质。ⅰ．当汽车发生较严重的碰撞时，引发NaN3分解2NaN3 = 2Na + 3N2，从而为气囊充气。N2的电子式为_________。ⅱ．产生的Na立即与Fe2O3发生置换反应生成Na2O，化学方程式是________。ⅲ．NaHCO3是冷却剂，吸收产气过程释放的热量。NaHCO3起冷却作用时发生反应的化学方程式为________。ⅳ．一个安全气囊通常装有50 g NaN3，其完全分解所释放的N2为_______mol。 （4）工业通过电解NaCl生产金属钠：2NaCl(熔融)2Na+Cl2，过程如下：已知：电解时需要将NaCl加热至熔融状态。NaCl的熔点为801℃，为降低能耗，通常加入CaCl2从而把熔点降至约580℃。①把NaCl固体加热至熔融状态，目的是________。②电解时，要避免产生的Na与Cl2接触而重新生成NaCl。用电子式表示NaCl的形成过程________。 ③粗钠中含有少量杂质Ca，过程Ⅱ除去Ca的化学方程式是________。④过程Ⅰ中，CaCl2能发生像NaCl那样的电解反应而被消耗。但在过程Ⅰ中CaCl2却不断地被重新生成，原因是________。