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金属钛被称为铝之后崛起的第三金属,它是空间技术、航海、化工、医疗上不可缺少的材料。 I、工业上用钛矿石(FeTiO 3 ,含FeO、Al 2 O 3 、SiO 2 等杂质)经过下述反应制得: 其中,步骤②发生的反应为:2H 2 SO 4 +FeTiO 3 =TiOSO 4 +FeSO 4 +2H 2 O。 (1)净化钛矿石时,是否需要除去杂质FeO?答:_________(填“需要”或“不需要”) (2)净化钛矿石时,需用浓氢氧化钠溶液来处理,写出该过程中发生反应的离子方程式 。 II、为了提高资源的利用率,减少环境污染,可将氯碱厂、炼钛厂和甲醇厂组成产业链,其关系如下图所示。 (3)写出钛铁矿经氯化法得到四氯化钛的化学方程式_________________________。 (4)已知:①Mg(s)+Cl 2 (g)=MgCl 2 (s);△ H =一641 kJ·mol -1 ②1/2Ti(s)+Cl 2 (g)=1/2TiCl 4 (l);△ H =一385 kJ·mol -1 则Mg 与TiCl 4 反应的热化学方程式为 , 该反应在氩气氛中进行的理由是 。 (5)在上述产业链中,合成192 t 甲醇理论上需额外补充H 2 t (不考虑生产过程中物质的任何损失)。
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【单选题】下列哪种商品需求的收入弹性最小
A.
衣服
B.
大米
C.
家具
D.
珠宝
【单选题】Which of the following is the best response to other people’s compliments on your cooking?
A.
I just made some dishes casually and they are not very tasty.
B.
The praise is too much and the foods are just so common.
C.
I am so glad that you liked it. I cook it especially for you.
D.
You are welcome.
【多选题】革兰染色液包括
A.
结晶紫
B.
复红
C.
卢戈碘液
D.
乙醇
E.
美蓝
【单选题】Which of the following is the best response to other people’s compliments on your cooking?
A.
I am so glad that you liked it. I cook it especially for you.
B.
I just made some dishes casually and they are not very tasty.
C.
The praise is too much and the foods are just so common.
D.
You are welcome.
【单选题】下列哪种商品的需求收入弹性最大
A.
面包
B.
家具
C.
衣服
D.
珠宝
【简答题】产生冷裂纹的三要素是()()()。
【单选题】革兰染色的染液包括()
A.
结晶紫、碘液、盐酸酒精、沙黄
B.
结晶紫、碘液、沙黄、 95% 乙醇
C.
. 结晶紫、亚甲蓝、碘液、盐酸酒精
D.
结晶紫、碘液、 95% 乙醇、亚甲蓝
【简答题】Dressing in the latest fashion trends may give you the reputation of being efficient. 2. There are many more pros of relying on workplace fashion trends than there are cons. 3. If you work in a retai...
【多选题】新闻营销的借势策略包括()
A.
借名人
B.
借事件
C.
借体育
D.
借热点
【简答题】Listen to a radio program on compliments in American English. Complete the answers to the following questions according to what you hear. 1 . What are the common structures Americans use to compliment...
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