（6）溶液的浓度——2021-2022学年九年级下册化学人教版课后天天练
※题型：单选题※知识点：单选题※试题难度：中等<br>现有一杯20<img src="https://picture2.zhihuicn.com/testImage/2/2019/11/4/477350043A51D10326237306BD60C138.png"><br>的某溶质的溶液.欲改变其溶质质量分数,一定可行的方法是( )<br>A.加入一定量的溶质<br>B.增大压强<br>C.升温到60<img src="https://picture2.zhihuicn.com/testImage/2/2019/11/4/477350043A51D10326237306BD60C138.png"><br>D.加入一定量的水<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2019/24e8ad4abd324ee98bb5765193b2d915/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2019/ad722c5377ee40299b84729c566fa241/046706355D2A990F7F141B3C254CF127.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>将50g98%的浓硫酸溶于450g水中,所得溶液中溶质的质量分数为( )<br>A.9.8% B.10.2% C.10.8% D.19.6%<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2019/8dc8b2047f574ec5b57d05c1a98807b2/E7F0EDF83F40244C8F0C84B97471AED6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2019/164d158d005a4c31b33fd132051f9519/BB0EAA89EB3F317DF387CA17148B0698.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>下列关于“10%的硝酸钾溶液”含义的说法中,错误的是( )<br>A.100g水中溶解了10g硝酸钾<br>B.100g硝酸钾溶液中有10g硝酸钾<br>C.将10g硝酸钾溶于90g水中所得的溶液<br>D.将硝酸钾与水按1:9的质量比配制的溶液<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2020/daf3d5318f2d40d499e2069ae0fa3636/E7F0EDF83F40244C8F0C84B97471AED6.png"><br>解析<br>略<br>※题型：单选题※知识点：单选题※试题难度：中等<br>t℃时<br>m<br>gKNO<sub>3</sub>的不饱和溶液恒温蒸发水分,直到有少量晶体析出,在此过程中,溶液中溶质质量分数(a%)与时间(t)的变化关系可用下图表示的是( )<br>A.<img src="https://picture2.zhihuicn.com/testImage/2/2019/10/28/DD99FDFB11F4D5366A0AE221E469F39D.png"><br>B.<img src="https://picture2.zhihuicn.com/testImage/2/2019/10/28/014FE868A19562F926A8DEAA98596088.png"><br>C.<img src="https://picture2.zhihuicn.com/testImage/2/2019/10/28/9785298D6E19088E271FBFC4C3865665.png"><br>D.<img src="https://picture2.zhihuicn.com/testImage/2/2019/10/28/30181FA19AF5749FA261BD8D93D4DC17.png"><br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2019/c65be2ae14ca4318838d7cbf62dd2bc4/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2019/ed35082b532442af9bf89513d3424756/87F72A89668A470BE1A90EDE341CF255.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>常温下,对<img src="https://picture2.zhihuicn.com/testImage/2/2020/1/8/CEA13E16D77938AA9CD76FE079A2CC29.png"><br>氯化钠饱和溶液进行如图所示实验。下列分析错误的是( )<img src="https://picture2.zhihuicn.com/testImage/2/2020/1/8/2AED0F007AF5196E838E91617898B82C.png"><br>A.实验1后,甲、乙中溶液的溶质质量分数相等<br>B.实验2后,乙中比甲中氯化钠的溶解度大<br>C.实验2后,甲中溶液为氯化钠的不饱和溶液<br>D.实验2后,甲、乙中溶液所含溶质质量相等<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2020/66b367181b8a4b40a88e1457254ace03/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2020/c0ce73aee12f41e9b58886afe8765255/3F8A3FD9AD1DF922DDC7C0A1D8BD348A.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>A、B、C三种物质的溶解度曲线如图所示。下列分析正确的是( )<img src="https://picture2.zhihuicn.com/testImage/2/2019/11/4/A25ECDAA13D48132055EAF1BC1C88046.png"><br>A.t<sub>1</sub><img src="https://picture2.zhihuicn.com/testImage/2/2019/11/4/477350043A51D10326237306BD60C138.png"><br>时,A、C两种物质的饱和溶液中溶质的质量相等<br>B.t<sub>2</sub><img src="https://picture2.zhihuicn.com/testImage/2/2019/11/4/477350043A51D10326237306BD60C138.png"><br>时,把50gA放入50g水中能得到A的饱和溶液,其中溶质和溶液的质量比为1:3<br>C.将t<sub>2</sub><img src="https://picture2.zhihuicn.com/testImage/2/2019/11/4/477350043A51D10326237306BD60C138.png"><br>时.A、B、C三种物质的饱和溶液降温至t<sub>1</sub><img src="https://picture2.zhihuicn.com/testImage/2/2019/11/4/477350043A51D10326237306BD60C138.png"><br>,所得溶液的溶质质量分数的大小关系是B>C=A<br>D.将C的饱和溶液变为不饱和溶液,可采用升温的方法<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2019/e48542fb65044957a61eee6ab1064170/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2019/b50dd2633227447daa72df2d68f80989/E310C550B33EBB96441E11BC36E027F7.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>向200g溶质质量分数为10%的蔗糖溶液中加入200g水,搅拌后把所得溶液倒掉一半,剩余溶液的溶质质量分数为( )<br>A.10% B.5% C.2.5% D.0.5%<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2020/09e7203f48b24adc9097542943a2d184/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2020/c4a52a1551474416870ceb6b78083727/953DDECFE11B6B7EC6453C31E2392E9D.png"><br><br>※题型：填空题※知识点：填空题※试题难度：较易<br>工业上常用红锌<br>矿<br>(<br>主要含<br>ZnO<br>)<br>和<br>18%<br>?<br>25%<br>的稀硫酸为原料制取<br>硫酸锌。<br>1.硫酸锌中硫元素和氧元素的质量比是。2.100g溶质质量分数为98%的浓硫酸配制成溶质质量分数为20%的稀硫酸,需要水的质量g。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2019/dee54532967d42c999cb38892ebbe4b1/14FD6CDF6D6D059BC2935E53A79B3352.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2019/14f2538d6b0a4a898ef848b538a23008/7B50CE513B44DCDBD9F97DEC6AAAE214.png"><br><br>※题型：实验题※知识点：实验题※试题难度：中等<br>农业上常用质量分数为<br>%的<br>NaCl<br>溶液选种。实验室配制<br>100<br>g<br>该浓度溶液的过程如图所示。<br><img src="https://picture2.zhihuicn.com/testImage/2/2020/1/3/376C7E886C6AE5D1C4965873E82E8F7D.png"><br>请回答下列问题<br>:<br>1.配制该溶液正确的操作顺序为(填步骤序号)。2.用托盘天平称量所需的氯化钠时,发现托盘天平的指针偏向左盘,应。A增加适量氯化钠固体B减少适量氯化钠固体C.调节游码D添加砝码3.将氯化钠和水依次倒入烧杯中,用玻璃棒搅拌,其目的是。4.在配制一定浓度的氯化钠溶液时,下列操作会造成溶液的浓度偏小的是。①用量筒量取水时,俯视读数②试剂、砝码的左右位置颠倒且使用游码③用量筒量取水时,仰视读数④用于溶解的烧杯中有少量的蒸馏水⑤转移溶液时有部分液体溅出<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2020/a22cca2ada8a4dfaa853246920e7b03a/6CB5B3418F2889A12EDA573B57859B9F.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2020/cde11c88dee147289322d12ff200806b/0B0BD60D75F379E6FA915D3FC9B1E7CE.png"><br><br>
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