1.科学探究题- (共1题)
(查阅资料)(1)食用醋精中含有10%~15%的醋酸,呈无色;食品干燥剂主要成分是氧化钙;鸡蛋壳主要成分是碳酸钙;
(2)牵牛花汁液在酸性溶液中显红色,在中性溶液中显紫色,在碱性溶液中显蓝色。
(实验探究)
实验步骤 | 实验现象 | 实验结论 |
①将牵牛花汁液滴入醋精中 | ______________ | 酸能与指示剂反应 |
②将生锈铁钉放入醋精中 | 铁锈逐渐消失,溶液变为______色,一段时间后有气泡冒出 | 酸能与某些金属氧化物反应, 酸能与某些______反应 |
③将碎鸡蛋壳放入醋精中 | 有___________冒出 | 酸能与某些盐反应 |
④将纯碱放入醋精中 | 有气泡冒出 | 酸能与碱反应 |
(反思与评价)(1)小红想利用pH试纸进一步测定醋精的酸碱度,具体操作方法是__________;
(2)小明认为步骤④不能得到“酸能与碱反应”的结论,理由是___,写出可以代替的物质________。
(实验验证)小明重新设计以下方案验证“酸能与碱反应”。
实验步骤 | 实验现象 |
Ⅰ. 向食品干燥剂中加入适量的水,充分反应后,静置,取上层清液 | 放出大量热, |
Ⅱ. 向上层清液中加入牵牛花汁液,再逐滴滴入醋精 | __________ |
(拓展与应用)(1)请你为食品干燥剂的包装袋设计一条注意事项:______________;
2.计算题- (共1题)
3.简答题- (共3题)

(1)t2℃时,A物质的溶解度____(填“>”、“:”或“<”)B物质的溶解度。
(2)将t2℃时A、B两种物质的饱和溶液降温至 t1℃(其它条件不变),没有晶体析出的是___________。
(3)t2℃时,有一接近饱和的A溶液,可采用______(任写一种)的方法,使它变为饱和溶液。
(4)t2℃时,将35gA物质投入100g水中,充分搅拌后,所得溶液中溶质质量分数是__________。









4.推断题- (共1题)

(1)写出B、C的化学式:B___________,C___________。
(2)C转化成A的化学方程式为_________。A转化成B的化学方程式为_______,基本反应类型是_______。
5.单选题- (共9题)
A.氢氧化钙溶液敞口放在空气中会变质 | B.氢氧化钙的溶解度随温度的升高而升高 |
C.氢氧化钙在农业上可改良酸性土壤 | D.氢氧化钙的俗名叫做熟石灰、消石灰 |
A.浓盐酸和浓硫酸露置在空气中,溶质的质量分数都会减小 |
B.用蒸馏水润湿的pH试纸来测定10%的盐酸溶液的pH,结果偏小 |
C.生成盐和水的反应一定是中和反应。 |
D.炼铁是把单质铁变成氧化铁的过程 |
A. 用硫酸除铁锈:FeO+H2SO4=FeSO4+H2O
B. 正常雨水的pH约为5.6的原因:CO2 + H2O=H2CO3
C. 医疗上用碱性物质中和过多胃酸:NaOH + HCl=NaCl + H2O
D. 除去铜粉中少量的铁粉:2Fe+6HCl=2FeCl3 +3H2↑
6.选择题- (共2题)
根据首字母提示,完成短文填空。
Cannon has shown a great interest in collecting flags. At the young age of four, Cannon began studying flags, d{#blank#}1{#/blank#} them in his coloring books and putting them up on his walls. Throughout school, he studied flags and tried to find out all he could about them. After university, Cannon s{#blank#}2{#/blank#} to be a lawyer. Throughout law school, he continued to collect flags. His classmates, friends, and family started c{#blank#}3{#/blank#} him “the flagman.”
Cannon now has more than 200 flags in his collection. He shows many of them in his downtown law office. Once he d{#blank#}4{#/blank#} country flags for an exhibition on the Olympics.
In addition to collecting flags, Cannon also w{#blank#}5{#/blank#} about them. He has published three books about flags. He loves to h{#blank#}6{#/blank#} from friends who see his b{#blank#}7{#/blank#} in stores all over the world. A few years ago, Cannon's hobby r{#blank#}8{#/blank#} a new level. He entered a flag design contest and won. The country he lives in asked him to design its f{#blank#}9{#/blank#}. Cannon explains his hobby this way, “Collecting flags is l{#blank#}10{#/blank#} collecting pieces of history.”
7.填空题- (共1题)
(1)可用作洗涤剂的是(化学式,下同)_____;
(2)可用作调味剂的______ ;
(3)可用作补钙剂是____;
(4)可用作食品干燥剂的是________;
(5)可用作发酵粉和治疗胃酸过多症的是________;
(6)炉具清洁剂中含有的是___________________;
8.实验题- (共1题)
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【1】题量占比
科学探究题:(1道)
计算题:(1道)
简答题:(3道)
推断题:(1道)
单选题:(9道)
选择题:(2道)
填空题:(1道)
实验题:(1道)
-
【2】:难度分析
1星难题:0
2星难题:0
3星难题:0
4星难题:1
5星难题:0
6星难题:10
7星难题:0
8星难题:5
9星难题:1