本课配套习题挑战模式1/5
单选题
难度系数:
1.下列化学变化中吸收热量的是
A: 高温下碳和二氧化碳反应 |
B: 稀盐酸与氢氧化钠反应 |
C: 镁与稀盐酸反应 |
D: 一氧化碳燃烧 |
一次做对,真牛!
+5奖励规则>
- 提示1:5qC55o2u5bi46KeB5YyW5a2m5Y+N5bqU5Y+R55Sf5pe25Ly06ZqP55qE6IO96YeP5Y+Y5YyW6L+b6KGM5YiG5p6Q
- 答案:QQ==
QeOAgeeis+WSjOS6jOawp+WMlueis+mcgOimgeWcqOmrmOa4qeS4i+aJjeiDveWPjeW6lO+8jOivtOaYjuivpeWPjeW6lOaYr+WQuOaUtueDremHj+eahO+8jOato+ehru+8mzxicj5C44CB56iA55uQ6YW45LiO5rCi5rCn5YyW6ZKg5Y+R55Sf5Lit5ZKM5Y+N5bqU77yM5pS+5Ye654Ot6YeP77yM6ZSZ6K+v77ybPGJyPkPjgIHplYHkuI7nqIDnm5Dphbjlj43lupTvvIzkvJrmlL7lh7rlpKfph4/nmoTng63vvIzplJnor6/vvJs8YnI+ROOAgeS4gOawp+WMlueis+eHg+eDp++8jOaYr+WPkeWFieWPkeeDreeahOWJp+eDiOawp+WMluWPjeW6lO+8jOmUmeivr+OAguaVhemAiUE=
本课配套习题挑战模式2/5
多选题
难度系数:
2.下列反应属于放热反应的是
A: |
B: |
C: |
D: |
一次做对,真牛!
+5奖励规则>
- 提示1:5LiA6Iis6ZyA6KaB5Yqg54Ot55qE5Y+N5bqU5Li65ZC454Ot5Y+N5bqU44CC
- 提示2:54eD54On5Y+N5bqU5Y+v5Lul5pS+5Ye65aSn6YeP55qE54Ot
- 答案:QyxE
5pys6aKY5Lit77yMQeOAgULku47lj43lupTmnaHku7bmnaXnnIvvvIzmmK/mmI7mmL7nmoTlkLjng63lj43lupTvvJs8YnI+6ICMQ+aYr+eHg+eDp+WPjeW6lO+8jOWxnuS6juaUvueDreWPjeW6lO+8jDxicj5E5bC9566h5rKh5pyJ5Y+N5bqU5p2h5Lu277yM5L2G5Lmf5piv5pS+54Ot5Y+N5bqU77yM5YGa5a6e6aqM5pe277yM6IO95piO5pi+5oSf6KeJ5Yiw6K+V566h5Y+R54Ot44CC
本课配套习题挑战模式3/5
单选题
难度系数:
3.物质发生变化时,常常会表现出吸热或放热现象,下列变化会吸热的是
A: 干冰升华 |
B: 氢氧化钠固体溶于水 |
C: 镁和稀盐酸反应 |
D: 天然气燃烧 |
一次做对,真牛!
+5奖励规则>
- 提示1:5bmy5Yaw5Y2H5Y2O5piv5LiA5Liq54mp55CG5Y+Y5YyW77yM55Sx5Zu65oCB5Yiw5rCU5oCB6ZyA6KaB5ZC45pS254Ot6YeP44CC
- 提示2:5by66YW45by656Kx5rq25LqO5rC05Z2H5Lya5pS+5Ye65aSn6YeP55qE54Ot44CC
- 提示3:54eD54On5Y+N5bqU5pS+5Ye654Ot6YeP
- 答案:QQ==
QeOAgeW5suWGsOWNh+WNjuaYr+eUseWbuuaAgeWPmOaIkOawlOaAge+8jOWPmOWMlui/h+eoi+WQuOaUtueDremHj++8jOato+ehru+8mzxicj5C44CB5rCi5rCn5YyW6ZKg5Zu65L2T5rq25LqO5rC05ZCO5rq25ray5rip5bqm5Y2H6auY77yM6K+05piO6K+l5Y+Y5YyW5pS+5Ye654Ot6YeP77yM6ZSZ6K+v77ybPGJyPkPjgIHph5HlsZ7lkozphbjlj43lupTml7bmlL7lh7rng63ph4/vvIzmuKnluqbljYfpq5jvvIzplJnor6/vvJs8YnI+ROOAgeeJqei0qOeHg+eDp+aXtumDveS8muaUvuWHuueDremHj++8jOS6uuS7rOWIqeeUqOWPr+eHg+eJqeeHg+eDp+iOt+W+l+iDvemHj++8jOmUmeivr++8jjxicj7mlYXpgIlB77yO
本课配套习题挑战模式4/5
单选题
难度系数:
4.2006年5月24日,三峡大坝最后一仓混凝土(成分中含有氧化钙)开始浇筑.其水化过程的反应是CaO+H2O=Ca(OH)2,为了防止浇筑过程中混凝土水化放出的热量使坝体温度升高,技术人员在仓内埋设了许多管道,一旦温度升高,则通水冷却.下列说法中错误的是
A: 混凝土的水化过程包含化学变化 |
B: 混凝土是混合物 |
C: 混凝土的水化过程中吸收热量 |
D: 钢筋混凝土凝固以后才变得坚硬 |
一次做对,真牛!
+5奖励规则>
- 提示1:5L+h5oGv5omA57uZ5Ye655qE5Y+N5bqU5piv55Sf55+z54Gw5Y+Y5Li654af55+z54Gw55qE5Y+N5bqU77yM5pS+5Ye65aSn6YeP54Ot44CC
- 答案:Qw==
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
本课配套习题挑战模式5/5
单选题
难度系数:
5.按如图所示装置进行实验.将胶头滴管中的水滴入瓶中,a、b处水面无明显变化.则瓶中固体为
A: 烧碱 |
B: 生石灰 |
C: 食盐 |
D: 硝酸铵 |
一次做对,真牛!
+5奖励规则>
- 提示1:5ray6Z2i55qE5Y+Y5YyW5piv55Sx5LqO5rip5bqm5Y+R55Sf5pS55Y+Y77yM54Ot6IOA5Ya357yp77yM5L2/5b6X55O25YaF55qE5Y6L5by65Y+R55Sf5LqG5pS55Y+Y44CC
- 提示2:5Zug5q2k5Y+q6ZyA6KaB5o6o5pat5Ye65ZOq5LiA6aG55LiO5rC05Y+N5bqU5oiW6ICF5rq25LqO5rC05pe25LiN5pS+54Ot5Lmf5LiN5ZC454Ot5Y2z5Y+v44CC
- 答案:Qw==
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