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"氟化钙"相关考试题目
1.
氟化钙可溶于盐酸、氢氟酸、硫酸、硝酸和铵盐溶液，不溶于丙酮。()
2.
氟化钙盐水的共晶点湿度是（）
3.
萤石含有较高的氟化钙CaF2，能显著降低炉渣熔点，提高炉渣流动性因而是最强的洗炉剂。
4.
证明氟化氢是弱电解质的事实是( ) A．氟化氢在所有卤化氢中热稳定性最强 B．浓H2SO4加入氟化钙固体中，加热，有氟化氢气体产生 C．100 mL 0.1 mol/L氢氟酸中c(H＋)小于0.1 mol/L D．测得常温下0.1 mol/L NaF溶液的pH＞7
5.
Section BDirections: There are 2 passages in this section．Each passage is followed by some questions or unfinished statements．For each of them there are four choices marked A, B, C and D．You should de...
6.
粉剂由二氧化硅、三氧化二铝和氟化钙组成的粘固粉是（）
7.
A subject which seems to have been insufficiently studied by doctors and psychologists is the influence of geography and climate on the psychological and physical health of mankind. Them seems no doub...
8.
装炉用料使用量：阳极16组、焦粒750千克、石墨（）千克、冰晶石15吨、纯碱1吨、氟化钙0.9吨，启动灌铝13.5吨。
9.
氟与钙结合形成氟化钙，沉积于骨骼和软组织中，导致血钙降低。（ ）
10.
碱性焊条 其熔渣的成分主要是碱性氧化物和氟化钙,其药皮类型为低氢钠型、低氢钾型的焊条
11.
（2011年浙江衢州，36题）2011年3月10日，我市某化工企业发生了氢氟酸泄漏事件，经过消防官兵现场处理，泄漏得到了控制。氢氟酸是氟化氢(HF)气体的水溶液，呈酸性，且有剧毒性和腐蚀性，当氢氟酸少量泄漏时，可用砂土和干燥熟石灰的混合物处理。氢氟酸的化学性质与盐酸相似，能与熟石灰[Ca(OH)2]发生中和反应生成氟化钙(CaF2)和水。请根据上述信息分析回答：(1)氢氟酸的pH7(选填“>...
12.
A subject which seems to have been insufficiently studied by doctors and psychologists is the influence of geography and climate on the psychological and physical health of mankind. Them seems no doub...
13.
氢氟酸洗废液一般采用氟化钙沉淀法处理
14.
A subject which seems to have been insufficiently studied by doctors and psychologists is the influence of geography and climate on the psychological and physical health of mankind. Them seems no doub...
15.
粉剂由二氧化硅、三氧化二铝和氟化钙组成的黏固粉是
16.
氟化钙能与多种金属氧化物形成低共熔物。()
17.
求氟化钙的溶解度： （1）在纯水中（忽略水解）； （2）在0.01 mol·L-1CaCl2溶液中； （3）在0.01mol·L-1HCl溶液中。
18.
A subject which seems to have been insufficiently studied by doctors and psychologists is the influence of geography and climate on the psychological and physical health of mankind. Them seems no doub...
19.
已知25℃时，电离常数Ka(HF)＝3.6×10－4 mol/L.溶度积常数Ksp(CaF2)＝1.46×10－10.现向1 L 0.2 mol/L HF溶液中加入1 L 0.2 mol/L CaCl2溶液．则下列说法不正确的是 [ ] A．25℃时，0.1 mol/L HF溶液中pH>1 B．Ksp(CaF2)随温度的变化而变化 C．氟化钙和氟化氢都是弱电解质 D．该体系中有...
20.
牙釉质的无机化合物碳酸钙、磷酸镁和氟化钙占总量的
21.
氟化钙的Ksp=2.7×10-11，试求CaF2的溶解度。
22.
饮水中含一定量氟化钙时，能防治牙病．氟化钙的化学式为CaF2，则氟元素的化合价为（ ）
23.
A subject which seems to have been insufficiently studied by doctors and psychologists is the influence of geography and climate on the psychological and physical health of mankind. Them seems no doub...
24.
从焊条药皮成分上看,影响碱性焊条交流稳定性的因素主要是氟化钙。
25.
氟化钙微溶于稀无机酸，几乎不溶于水。()
26.
粉剂由二氧化硅、三氧化二铝和氟化钙组成的粘固粉是______
27.
氟化钙可以用作玻璃的乳浊剂。
28.
萤石含有较高的氟化钙，能显著降低炉渣熔点，提高炉渣流动性，因而是最强的（）。
29.
熔渣以（）和氟化钙为主的焊条称为碱性氧化物焊条。
30.
氢氟酸洗废液一般采用氟化钙沉淀法处理。
31.
氢氟酸HF是一元弱酸,是由硫酸和矿物质氟化钙反应生成的,研究HF稀溶液对其他矿物质的影响,制备了0.010 mol/L的HF水溶液,计算在常温下该溶液的pH =( )。(HF的Ka = 6.8 10 )
32.
牙釉质的无机化合物碳酸钙、磷酸镁和氟化钙占总量的（）
33.
氟化钙（CaF2）是一种透明陶瓷材料，不仅耐高温，而且具有优异的光学性能，用于防弹玻璃和防护眼镜等。CaF2中F元素的化合价是
34.
焊剂按其氟化钙含量的多少可分为低氟焊剂、中氟焊剂和（）。
35.
在工业上和实验室里都用浓硫酸与萤石(氟化钙)作用，制备无水氟化氢。()
36.
氟化钙的主要作用是有利于（）的形成。
37.
按重量计氟化钙含量≤97%的萤石
38.
碱性焊条的药皮含有氟化钙，除氢效果好，所以称为低氢型焊条。( )
39.
炼钢用萤石要求含氧化钙和氟化钙高，二氧化硅低。（）
40.
当向冰晶石熔体中添加少量氟化钙，可以使熔体的初晶温度（），密度（），导电率（）。
41.
A subject which seems to have been insufficiently studied by doctors and psychologists is the influence of geography and climate on the psychological and physical health of mankind. Them seems no doub...
42.
含氟牙膏有明显的防龋效果。含氟牙膏在世界范围的广泛应用是使龋病患病率出现大幅度下降的原因之一。含氟牙膏常用的氟化物不包括A、单氟磷酸钠B、氟化亚锡C、氟化钠D、氟化钙E、氟化胺儿童含氟牙膏常用氟浓度为A、10ppmB、500ppmC、1000ppmD、10000ppmE、1ppm
43.
称取工业原料氟化钙0.5000g，于250ml烧杯中，加水使试样湿润，用盐酸及硼酸溶解以后移动入250ml容量瓶中，用水稀释至刻度.移取25ml于锥形瓶中，加入三乙醇胺掩蔽杂质铁，铝，在PH＝12时，用0.02000mol/LEDTA溶液滴定，问约消耗EDTA溶液多少毫升？提示：工业原料CaF2一般含量为98%左右，CaF2的摩尔质量为78.08g/mol
44.
A subject which seems to have been insufficiently studied by doctors and psychologists is the influence of geography and climate on the psychological and physical health of mankind. Them seems no doub...
45.
称取工业原料氟化钙0.5000g,于250ml烧杯中,加水使试样湿润,用盐酸及硼酸溶解以后移动入250ml容量瓶中,用水稀释至刻度.移取25ml于锥形瓶中,加入三乙醇胺掩蔽杂质铁,铝,在PH=12时,用0.02000mol/LEDTA溶液滴定,问约消耗EDTA溶液多少毫升?提示:工业原料CaF2一般含量为98%左右,CaF2的摩尔质量为78.08g/mol
46.
A subject which seems to have been insufficiently studied by doctors and psychologists is the influence of geography and climate on the psychological and physical health of mankind. Them seems no doub...
47.
牙釉质的无机化合物碳酸钙、磷酸镁和氟化钙占总量的（）.
48.
氟化钙晶体结构中，钙离子形成面心立方堆积，氟离子填充了（ ）的四面体间隙。
49.
A subject which seems to have been insufficiently studied by doctors and psychologists is the influence of geography and climate on the psychological and physical health of mankind. Them seems no doub...
50.
含有稀土元素的萤石，经日光照射后可持续发光数十小时，民间称之为“夜明珠”。萤石的主要成分氟化钙（CaF2）中氟元素的化合价为
