2026年鲁教版适配小学三年级化学三模押题卷化学方程式与计算标准试卷第309套（含答案解析与可打印作答区）

三年级化学三模押题卷第309套第页学校：________________班级：________________姓名：________________考号：________________考试时间：120分钟满分：120分题量：28题适用：小学三年级答题说明1.本卷为化学启蒙试卷，重点考查生活中的物质、实验观察、安全表达、简单质量加减和基础符号识读。2.选择题每题只有一个最佳答案；填空题请把字写在横线上；实验题要用完整、清楚、诚实的语言记录看到的现象。3.不品尝实验材料，不直接闻气味，不把实验材料带离桌面；遇到不确定的现象先举手询问。4.诚信作答，保持卷面整洁。答案写错可轻轻划掉后改写，不涂抹整片作答区。一、选择题（本大题共12小题，每小题3分，共36分）1.（3分）观察一杯不认识的透明液体时，最安全的做法是（）。A.先尝一口，看看是不是甜的B.把鼻子贴近杯口用力闻C.先看标签，再在老师指导下轻轻扇闻D.倒在手心里搓一搓2.（3分）冰块放在桌上慢慢变成水，这个变化主要说明（）。A.物质的状态会改变B.冰块变成了糖水C.冰块消失后没有留下任何物质D.冰块一定变成了空气3.（3分）下列物品中，通常用来表示“水”的符号是（）。A.H2OB.O2C.CO2D.NaCl4.（3分）做“盐放进水里”的观察时，下面记录最清楚的是（）。A.很神奇B.盐不见了，好像溶进水里，水仍然是透明的C.我觉得好玩D.颜色一定变红了5.（3分）蜡烛燃烧时，最应该注意的是（）。A.离火焰近一些看得更清楚B.用手摸火焰的上方C.让长头发、纸张远离火焰D.把燃着的蜡烛放进书包6.（3分）下面哪一组都是生活中常见的物质名称？（）A.食盐、白糖、水B.月亮、笑声、影子C.跑步、唱歌、写字D.高兴、勇敢、认真7.（3分）密封袋里装着水和一些小石子，称量为80克。只是摇一摇，没有东西漏出，再称时最可能是（）。A.80克左右B.0克C.一定变成160克D.一定少了50克8.（3分）看到小苏打和醋混合后有很多泡泡，下面说法最合适的是（）。A.可以把泡泡吸进嘴里玩B.先记录泡泡、声音、气球鼓起等现象C.一定要把杯子摇到溢出来D.说明所有白色粉末都会这样9.（3分）下面哪个图示读法最接近“水变成水蒸气”？（）A.水→水蒸气B.水蒸气→石头C.食盐→纸D.沙子→糖10.（3分）如果杯子重20克，杯子和水一共重70克，那么水大约重（）。A.20克B.50克C.70克D.90克11.（3分）实验后整理桌面，下面做法正确的是（）。A.把剩下的材料随便倒进别人的杯子B.按老师要求把材料放回指定位置，洗手C.把标签撕掉，方便下次猜一猜D.把湿纸巾塞进抽屉12.（3分）“O2”在启蒙化学中常用来表示氧气。下面说法最合适的是（）。A.O2就是食盐B.O2可以帮助许多物体燃烧C.O2只能在糖里找到D.O2看得见、摸得着，像铅笔一样硬选择题答题栏题号123456789101112答案改正二、填空题（本大题共8小题，每小题4分，共32分）13.（4分）把“水、白糖、铁钉、空气”按要求填一填：能喝的常见液体是__________；常见的金属小物品是__________。________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________14.（4分）在“食盐放入水中”的实验中，食盐慢慢看不见了，我们可以说食盐__________在水里；记录时要写清看到的__________。________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________15.（4分）“水→水蒸气”中的箭头可以读作“__________”。这个图示表示水受热后状态发生了__________。________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________16.（4分）做实验时，遇到不认识的白色粉末，不能随便__________，也不能直接用鼻子贴近去__________。________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________17.（4分）杯子重15克，杯子和水一共重55克，水重__________克。这个计算用的是__________法。________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________18.（4分）密封袋里有30克水和10克小石子，袋子本身重5克，合起来是__________克；如果没有漏出，再称量应__________这个数。________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________19.（4分）符号H常用来表示氢，符号O常用来表示氧，H2O通常读作__________，O2通常读作__________。________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________20.（4分）观察实验现象时，可以写颜色、形状、声音、气味等，但要做到__________记录，不把猜想当作__________。________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________三、生活实验与材料阅读题（本大题共4小题，每小题7分，共28分）21.（7分）材料一：冰块在小碟子里放了一会儿，边上出现了水。小明说：“冰块变少了，水变多了。”小兰说：“冰和水都是同一种物质，只是样子变了。”（1）请在横线上写出你看到的主要现象。____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________（2）你更同意谁的说法？请写出一个简单理由。________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________22.（7分）材料二：同学们把10克白糖倒入60克清水中，用玻璃棒轻轻搅拌。过一会儿，杯中的白糖看不见了，水还是透明的。（1）“白糖看不见了”是不是说明白糖完全没有了？请在横线上写“是”或“不是”，再说明理由。____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________（2）如果杯子本身重30克，杯子、水和白糖合起来大约重多少克？请写出算式。____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________23.（7分）材料三：老师把少量小苏打放入透明杯，再倒入少量醋，杯中出现很多泡泡。老师把小气球套在杯口，气球慢慢鼓起来。（1）请写出两个可以观察到的现象。____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________（2）下面的图示“小苏打+醋→泡泡气体和其他物质”中，箭头表示什么？请用一句话说明。____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________24.（7分）材料四：两个小组把铁钉和塑料勺分别放在有少量水的透明盒里。几天后，铁钉表面有一点红褐色痕迹，塑料勺变化不明显。（1）请把材料中的观察结果填入表格。物品放置条件几天后的现象铁钉有少量水的透明盒塑料勺有少量水的透明盒（2）这项观察提醒我们，记录材料时要写清物品名称和观察时间。请再写一条安全或整理要求。____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________四、综合表达与简单计算题（本大题共4小题，每小题6分，共24分）25.（6分）厨房材料标签识读。请阅读下表，完成问题。标签常见样子安全提示食盐白色小颗粒只能按要求少量使用，不随便品尝白糖白色或淡色小颗粒实验中不当零食吃醋有酸味的液体不把鼻子贴近瓶口闻小苏打白色粉末不入口，不扬起粉末清水透明液体保持杯子干净，防止洒出（1）表中哪一种材料有酸味？____________________（2）表中哪一种材料是白色粉末？____________________（3）请写一句你会遵守的安全提示。____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________26.（6分）密封袋简单称量。一个空密封袋重5克，里面放入20克干沙和40克水，袋口封好，没有漏水也没有漏沙。（1）封好后，密封袋和里面材料一共重多少克？请写出算式。________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________（2）同学把袋子轻轻摇一摇，再称量，质量会明显变成两倍吗？请写出理由。________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________27.（6分）基础符号卡片。老师发给大家三张符号卡：H、O、C。又出示三张生活常见符号卡：H2O、O2、CO2。（1）请把下列符号和名称连一连：H2O——__________；O2——__________；CO2——__________。________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________（2）读“蜡烛+氧气→二氧化碳、水和光热”这个图示时，你能知道反应前有哪些材料？请写出两个。________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________28.（6分）安全观察表达。请你设计一个“小颗粒放入水中”的观察记录，只写观察，不做危险动作。（1）你准备观察哪一种安全材料？可以从食盐、白糖、干沙中选一种。____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________（2）请写出观察步骤中的两个安全做法。________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________（3）请写一条可能看到的现象和一条结论。_______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________