湖南省武冈市2019届九年级下学期期末考试化学试卷
※题型：单选题※知识点：单选题※试题难度：容易<br>根据日常经验和你所学的化学知识,判断下列变化不属于化学变化的是( )<br>A.酿制甜酒 B.煤炭燃烧 C.瓷器破碎 D.钢铁生锈<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/2b883a3a29fd47cd8cfe11b7550a6337/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/fa9d29613881457aa56417175cdf44d6/8C9F24316A9AE13EB8D514AB4AB19C69.png"><br><br>※题型：单选题※知识点：单选题※试题难度：容易<br>下列物质不能为人体提供能量的是( )<br>A.无机盐 B.蛋白质 C.糖类 D.油脂<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/f678abb0d1e249579241b13d5fb9b8e9/E7F0EDF83F40244C8F0C84B97471AED6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/5097644c13f84d9b908afb965d6be93f/7893964D87993E9DC3F077CB39F5654E.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>下列图示实验操作正确的是( )<br>A.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/30/9812EEEF16FA1DCEF4440C1DE03BBADE.png"><br>测待测溶液pH<br>B.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/30/F4DF95E638E9F9A4F6F9E1BD4EB6CC99.png"><br>蒸发<br>C.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/30/70D4D4E6F67F81CD941979523DF2FED8.png"><br>过滤<br>D.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/30/B64B6A8A7F4AEED2826C384324668867.png"><br>氧气验满<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/48b8db438a7a4903b8fc93a973b69723/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/69ed99a8ce8949b3ba7cdc1c752a842e/1AE6727B4ECDD6590F31A5611BDB025D.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>下列做法不正确的是( )<br>A.用熟石灰改良酸性土壤<br>B.用洗洁精清洗餐具上的油污<br>C.用食盐水检验硬水和软水<br>D.用氮气充入食品包装袋防腐<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2020/736fa458f7084e1d8f5ac2026bcd4ec2/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2020/f6157771eeff4cbab41229ccd6c1c427/8C044FB464306203A4737902E38323CB.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>下列物质的用途中,利用其物理性质的是( )<br>A.氧气用于炼钢<br>B.硫酸用于除铁锈<br>C.干冰用作制冷剂<br>D.碳酸氢钠用于治疗胃酸过多症<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/4698b3729cb24ddcb18286a587d298f7/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/e3422b87f76948edb9aa7ffbde9c4a3c/FCEE8DA9A572CA22DD8DD2152F8FDAAD.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>下列叙述正确的是( )。A.氯化钠是由钠离子和氯离子构成的化合物<br>B.分子在不停运动,原子不运动<br>C.原子的最外层电子数决定元素的种类<br>D.保持二氧化碳化学性质的粒子是碳原子和氧原子<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2020/d166cd8501684aa2a6b62b48fd612bc7/E7F0EDF83F40244C8F0C84B97471AED6.png"><br>解析<br>略<br>※题型：单选题※知识点：单选题※试题难度：较易<br>下列区分物质的试剂或方法不正确的是( )<br>A.用水区分氯化钙和碳酸钙<br>B.用闻气味的方法区分白酒和白醋<br>C.用盐酸区分黄金和黄铜(含锌)<br>D.用酚酞溶液区分氯化钠溶液和盐酸<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/38cd9f01f51f4a3487e7c18a1dfad51e/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/deeb3cef48e24e1e8f105790edbf353a/6E31ED78BAED464BC795D0DA9519B447.png"><br><br>※题型：单选题※知识点：单选题※试题难度：容易<br>下表是人体几种重要体液的正常pH范围,其中酸性最强的是( )<br><tbody><br>体液<br>唾液<br>胃液<br>血液<br>胆汁<br>正常pH范围<br>6.6~7.1<br>0.9~1.5<br>7.35—7.45<br>7.1~7.3<br></tbody><br>A.唾液 B.胃液 C.血液 D.胆汁<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/b176c51f620b4526a8f8e56b464629ed/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/faa61b2e9ae1435d9a5fe27498a6ea58/A63A04BA945E67E9B4C074F73F6649BE.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>抗癌新药西达本胺的化学式为<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/30/8D52406D476C59FA53EC2143D77C4C49.png"><br>,下列关于西达本胺的说法中正确的是( )<br>A.西达本胺是混合物<br>B.西达本胺有48个原子<br>C.西达本胺中碳元素和氢元素的质量比为22:19<br>D.西达本胺由碳、氢、氟、氮、氧五种元素组成<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/42c951dac42b4896b932917fd6ac0374/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/e958fbda00c34e49a65be5fd6f02e03d/82855634CA0389B5487CAA7E941CBF0E.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>交警常用装有重铬酸钾(<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/30/F963F0A4686584DED14F6E5BF88A2F7B.png"><br>)的仪器检测司机是否酒后驾车,因为酒中的乙醇分子能使橙红色的重铬酸钾变为绿色的物质。在<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/30/F963F0A4686584DED14F6E5BF88A2F7B.png"><br>中铬(Cr)元素的化合价是( )<br>A.+2 B.+3 C.+6 D.+7<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/fe36de5254374352b6e93dd5c9cb7794/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/e86edf83d9cb4491824fffbd1bc5bce7/DDA5923459288F20F69E4B07ABBBDE1C.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>下图是水分解的微观示意图,其中<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/30/469CC7FE6CBCF13B30607C36FB0DFBF8.png"><br>表示氧原子,●表示氢原子。以下说法正确的是( )<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/30/0AF5589B515CD6973B7A495E1D96790C.png"><br>A.反应前后原子种类没有改变<br>B.图中所示微粒构成的物质均属于化合物<br>C.该反应属于置换反应<br>D.该反应的化学方程式为:<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/30/8B8F3BD2A04785B676B6A9727F21AD2F.png"><br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/a9bbda57d86f4e75834f50a782c8597d/E7F0EDF83F40244C8F0C84B97471AED6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/e2efacae89db4add8593ce7315021bdf/8FC22AD4ED5155A08A5020A510043C50.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>取一定量的Mg放入<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/30/63116A891207AED4C20441DF9C31E3A7.png"><br>和<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/30/8A763D71E086C83FA2DCFA8805132E5B.png"><br>的混合溶液中充分反应后过滤,得到固体和滤液。下列说法错误的是( )<br>A.固体中只有Ag时,滤液一定呈蓝色<br>B.固体中有Cu和Ag时,滤液一定呈无色<br>C.固体中一定有 Ag,滤液中可能有<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/30/8A763D71E086C83FA2DCFA8805132E5B.png"><br>D.固体中可能有Cu,滤液中一定有<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/30/9D994E1CCEC30EE70B9977A736A94A61.png"><br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/93c5d1aef52347a7a51ed715a8391620/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/bf9a62d66f9647c9a6e85c8ce46b4d26/206133E9E4E1E0539E4113A1C306589E.png"><br><br>※题型：单选题※知识点：单选题※试题难度：容易<br>酸与碱的组成中一定都含有的元素是( )<br>A.氧元素 B.氢元素 C.氢、氧元素 D.金属元素<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/e096311db0934fb689afe3015d88f1f8/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/b4d35faa7a6943d5a020e21470b4800b/4FC325CEDCD47B594B19A2A3A451AD49.png"><br><br>※题型：单选题※知识点：单选题※试题难度：容易<br>氧化钙常用作食品干燥剂,其俗称是( )<br>A.生石灰 B.熟石灰 C.消石灰 D.石灰石<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/28f0c85f9f20451d93cd5c2439c3f85c/E7F0EDF83F40244C8F0C84B97471AED6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/fd0cd9fa2e6949159941f0f74f790df5/93371CEF8C62416C3A22BE36907AE33B.png"><br><br>※题型：单选题※知识点：单选题※试题难度：容易<br>下列化合物中,不能通过金属与酸反应而得到的是( )<br>A.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/30/D6ABB2428D0A114FFECCB9D56E06507E.png"><br>B.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/30/868381FB24A1235D78001A440BF00202.png"><br>C.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/30/E870852CF77501DFF2B093719B602D8B.png"><br>D.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/30/E2E905BAB9CC4896C858925D184118BB.png"><br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/3f42e0eec5174473af3069d8bb74a517/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/2081f336c30648c1acbd35fc143a67a5/A2730A749EF62660BE90025259D024D6.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>下图能正确表示加水稀释pH=11的溶液的是( )<br>A.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/30/1386D279E6B1CB96FFA07DB7C39B3DBE.png"><br>B.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/30/3B68F6ECC4678BF501258FA03F470987.png"><br>C.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/30/D07802CC8A0BEBAFD9FCE3A2821F4872.png"><br>D.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/30/A5BD7BB58AD521B7FED2DAA45BC30EA6.png"><br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/d07155c065f849058ace6b6eee48145f/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/b703e16aeb5e439db10c91fa2600e7c9/7F8A15450B908398B698FDCC151D6F83.png"><br><br>※题型：单选题※知识点：单选题※试题难度：容易<br>火箭推进器中盛有二种试剂<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/9/9DB72092155E4749B4021433BE8A5BC2.png"><br>和<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/9/7DB234BC8ABC7F751AB9BAA992EEF152.png"><br>;其发生化学反应的方程式:<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/9/D3BEC250A63457A8C1D87D3BDA206619.png"><br>,其中R的化学式是( )<br>A.<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/9/9DB72092155E4749B4021433BE8A5BC2.png"><br>B.<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/9/72E318180F1C3D00E8D8DCFDB2D09C08.png"><br>C.<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/9/D350503FAEB172B50F09D85EB5C5B0A3.png"><br>D.<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/9/4DFB8F0E078BDC07EF569A7A174E9CCB.png"><br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/dfd8686f0159402ba1b66fe660751072/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br>略<br>※题型：单选题※知识点：单选题※试题难度：容易<br>“绿色发展”、“低碳生活”等理念逐渐深入民心,下列做法不符合这一理念的是( )<br>A.出行多乘交通工具<br>B.生活中用火烧毁废旧塑料和橡胶<br>C.用废旧报纸制作铅笔杆<br>D.农业和园林改浸灌为喷灌和滴灌<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/2f4ec1f4846242c5b4b2be0e28d587a1/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/1d5d9ea1f51541a384cf563a921ffe77/1C07C28CDA744667A3FC9EE887E1C2DA.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>下列各组物质不能用于验证Mg、Fe、Cu三种金属活动性强弱的是( )<br>A.稀盐酸<br>B.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/30/D6ABB2428D0A114FFECCB9D56E06507E.png"><br>溶液 、 Fe、Cu<br>C.Mg、<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/30/2C69E08C3FBA7274E63D648701C4C33D.png"><br>溶液、Cu<br>D.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/30/D6ABB2428D0A114FFECCB9D56E06507E.png"><br>溶液、Fe、<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/30/AF154872D0EC786CACF677FD6F562EED.png"><br>溶液<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/db727b6552674ae7907294c5f571087d/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/9a5fb8b4b42f499bb9047e2647260513/6752C456DA065CC89BBCC770C4624D01.png"><br><br>※题型：问答题※知识点：问答题※试题难度：容易<br>用化学用语(即符号)表示:<br>1.氢离子_____<br>2.氢氧根离子_____3.碘酒中的溶剂_____4.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/30/022320F764A526311DCDA3EBFFF86FEA.png"><br>中硫元素的化合价_____<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/b3e7e99078bd49129921dacc4e88a836/8CBE586F833C1BC486F9E464DD7AB901.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/e786e58b8c354c929f8d305dc0f5894d/B3C8C6709FDE09D112B4214A6BF66344.png"><br><br>※题型：问答题※知识点：问答题※试题难度：较易<br>化学就在我身边,现有<br>A.<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/3/30/C33BDE800D867632B103C25FB2DA0A2F.png"><br>;<br>B.<br>浓盐酸;<br>C.<br>火碱;<br>D.<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/3/30/F11326033621B0DBF223234AB8C618D1.png"><br>;<br>E.<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/3/30/128F55B144935C78E07F02CFC2D09193.png"><br>从中选择适当的物质按下列要求填空(填序号):<br>1.可用作补钙剂的是_____;2.可用作复合肥,增强农作物生长的是_____;3.溶于水后,溶液的温度明显降低的是_____;4.敞口放在空气中,因变质而使本身质量增加的是_____。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/9dfdd7d44e724aac9ea2e2ecd6402ea0/B69CA226D9DFFE5B2D72D38B0B276E63.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/4d65cca1f0fd4ec9bc4ed07612943464/8778FFBAFCB425CAC3ECC8FE4DB786A0.png"><br><br>※题型：问答题※知识点：问答题※试题难度：容易<br>化学源于生活,生活中蕴含着许多化学知识:<br>1.用洗涤剂洗油污,是利用洗涤剂的_____作用;2.许多农村地区的生活用水是硬水,生活中常用_____的方法降低水的硬度:3.冰箱中的食物久放会产生异味,可用活性炭消除异味,请你根据化学知识思考:这是利用了活性炭的_____性;4.装食品用的塑料袋之所以能通过加热的方法封口,是因为这种塑料具有_____性。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/2d1380cbb898432e99c0f9700524b0ea/B1E713689A0A23BE229D03BAFE9EB641.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/8ce2bb0c4183428cae880efc86ba7c0c/8C464DF3DEF8F6BAD0785301B7B57D65.png"><br><br>※题型：问答题※知识点：问答题※试题难度：中等<br>铁锈的主要成分为<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/3/31/81E02897460BEC9D2C34F1614A4CC31C.png"><br>,将生锈的铁钉投入盛稀盐酸的试管中,首先看到的现象是铁锈消失,溶液变成黄色,是因为发生下列反应:<br>_____<br>(用化学方程式表示),该反应<br>_____<br>(填<br>“<br>是<br>”<br>或<br>“<br>不是<br>”<br>)复分解反应,过一会儿,看到固体表面产生气泡,是因为发生了下列反应:<br>_____<br>(用化学方程式表示),该反应属于<br>_____<br>反应类型。<br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/c288cdaea02144d786d2f5d47b496cbf/94F5EB09DC26E48F1426320EFDBAD876.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/000dab165731488ca296587c5e6dfeb6/25A93D052D9D5C3E515DC32DF1871789.png"><br><br>※题型：问答题※知识点：问答题※试题难度：较难<br>甲、乙、丙三种固体物质的溶解度曲线如图所示,试回答下列问题:<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/3/31/5F7766477367B45E3C1BA49ABBBD1626.png"><br>1.甲、乙、丙三种固体物质的溶解度受温度影响较大的是_____(选填“甲”或“乙”或“丙”);<br>2.欲将<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/31/97DE7627ECA82C404E1EFD3560FA9B7B.png"><br>时乙的不饱和溶液转化为该温度下的饱和溶液,可采取的方法是_____(任写一种方法);3.当甲中混有少量乙时,常用的提纯方法是_____(选填“降温结晶”或“蒸发结晶”);4.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/31/32950889DA083F8FEB4B456B77CE675B.png"><br>时,将40克甲物质放入50克水中,充分溶解后,所得溶液的质量是_____克;5.将相等质量的甲、乙两物质在<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/31/32950889DA083F8FEB4B456B77CE675B.png"><br>的饱和溶液降温至<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/31/97DE7627ECA82C404E1EFD3560FA9B7B.png"><br>时,析出晶体较多的是_____(选填“甲”或“乙”);6.将<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/31/32950889DA083F8FEB4B456B77CE675B.png"><br>时,甲、乙的饱和溶液降温到<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/31/97DE7627ECA82C404E1EFD3560FA9B7B.png"><br>,所得溶液中的溶质的质量分数的大小关系是甲_____乙(选填“>”、“<”或“=”);7.氧气的溶解度随温度变化的规律与图中的_____(选填“甲”、“乙”或“丙”)相似。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/d81c74dffc744676b57bde6fed4f0ff4/6E7FF46B839F1C9E0258A7736E1D9086.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/12de82322d8346d69a9eb0b1209b74d4/42413E537A5D32AA6A914ECAB1342444.png"><br><br>※题型：问答题※知识点：问答题※试题难度：较易<br>化学与生活密切相关,请结合实际填空:<br>1.生活中有一批生锈的铁制用具,它们生锈的原因是_____,为了防止铁制品生锈,试采取一项合理的防锈措施是_____;2.科学膳食是人类健康的保障,下表是小明家的食谱:<br><tbody><br>主食<br>副食<br>饮料<br>米饭、馒头<br>红烧肉、鸡蛋、豆腐汤<br>可乐<br></tbody><br>从所含营养素角度分析(除无机盐),你认为食谱中还应添加_____(填字母)<br>A牛肉 B清蒸鱼 C青菜 D牛奶<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/308fc4ba12f342d3ae243a75e5b5b7fc/310F33A94703097F6FD0CC13AEFCBA97.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/4235bab1b17b414d832347d3588ecab9/92A4A277F0A40B84677BD7C2C94B9978.png"><br><br>※题型：问答题※知识点：问答题※试题难度：容易<br>(<br>)向盛有氢氧化钠溶液的烧杯中滴入几滴酚酞溶液,溶液变成<br>_____<br>色,<br>pH_____<br>(选填<br>“<br>>、<br>=<br>、<<br>”<br>)<br>,逐滴向烧杯中滴入稀盐酸,观察到的现象是<br>_____<br>,溶液的<br>pH_____<br>(选填<br>“<br>增大<br>”<br>或<br>“<br>减少<br>”<br>或<br>“<br>不变<br>”<br>);<br>(<br>)有一瓶溶液的<br>pH<br>是<br>3.5<br>,如果要使溶液的<br>pH<br>升高,可以通过加<br>_____<br>的方法。<br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/a7bff2139a2f4fb29e0ef1e51ba46d48/BFCA6EE90F366E4940B61404CDA4CED0.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/81b4d43d231d491ab9e1a2f5fd7ce43a/1E1D6814F52F92E59D0F7A386233BD99.png"><br><br>※题型：计算题※知识点：计算题※试题难度：中等<br>向盛有<br>20.0<br>克稀盐酸的烧杯中倒入<br>克黄铜(铜锌合金)样品粉末,恰好完全反应,<br>称得未溶<br>物质质量为<br>2.4<br>克,试计算:<br>1.该黄铜样品中含锌的质量是_____克;<br>2.所用稀盐酸中溶质的质量分数是_____(结果保留一位小数);3.反应后所得溶液中溶质质量分数是_____(结果保留一位小数)。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/9e9f64c580734b54a7ec91861a14394e/E765E3D7C45A6A2C769EBF4E26BDD9AB.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/47852df264b6436194d9e0a9eb82e1af/36625130C7C38D64477D9F742D726114.png"><br><br>
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