本课配套习题挑战模式1/5
单选题
难度系数:
1.夏季到了,不少人喜饮碳酸饮料.某种碳酸饮料(不含其它酸性物质)中溶有较多的二氧化碳气体,小文同学将2-3滴紫色石蕊溶液滴入少量该碳酸饮料中,然后加热,可观察到溶液颜色的变化是
A: 先变蓝后变紫 |
B: 先变无色后变红 |
C: 先变红后变紫 |
D: 变红后颜色不再改变 |
一次做对,真牛!
+5奖励规则>
- 提示1:55+z6JWK6K+V5YmC5Zyo6YW45oCn5p2h5Lu25LiL5pi+57qi6Imy77yM5Zyo5Lit5oCn5p2h5Lu25LiL5Li657Sr6Imy44CC
- 提示2:5rip5bqm5Y2H6auY5Y+v5Lul5L2/5LqM5rCn5YyW56Kz5rCU5L2T6YC45Ye644CC
- 答案:Qw==
56Kz6YW46aWu5paZ5Lit5ZCr5pyJ5LqM5rCn5YyW56Kz5LiO5rC05Y+N5bqU55Sf5oiQ55qE56Kz6YW477yM5Zug5q2k5ZGI6YW45oCn44CC5Y+v5Lul5L2/55+z6JWK6K+V5YmC5Y+Y5Li657qi6Imy77ybPGJyPuWKoOeDreWQju+8jOS6jOawp+WMlueis+mAuOWHuu+8jOWboOatpOmlruaWmeS+v+WRiOS4reaAp+S6hu+8jOefs+iViuivleWJguaBouWkjee0q+iJsuOAguaVhemAiUM=
本课配套习题挑战模式2/5
单选题
难度系数:
2.向澄清的石灰水中通入二氧化碳,生成的沉淀是
A: CaCO3 |
B: CaO |
C: Ca(OH)2 |
D: BaSO4 |
一次做对,真牛!
+5奖励规则>
- 提示1:5r6E5riF55+z54Gw5rC055qE5oiQ5YiG5Li65rCi5rCn5YyW6ZKZ77yM6YCa5YWl5LqM5rCn5YyW56Kz5LmL5ZCO5Y+R55Sf5YyW5a2m5Y+N5bqU44CC
- 答案:QQ==
5bCG5LqM5rCn5YyW56Kz6YCa5YWl6Laz6YeP55qE5r6E5riF55+z54Gw5rC05Lit77yM5Lya55Sf5oiQ5LiN5rq25LqO5rC055qE56Kz6YW46ZKZ5rKJ5reA5ZKM5rC077yM5omA5Lul5rKJ5reA5Y2z5piv56Kz6YW46ZKZ77yOPGJyPuaVhemAiUHvvI4=
本课配套习题挑战模式3/5
单选题
难度系数:
3.可用同一化学原理解释的下列现象是①久置的石灰水液面上出现一层白色薄膜;②向澄清石灰水中不断吹气,石灰水变浑浊;③为了使刚用石灰浆刷过的墙壁快点干燥,常在室内生一盆炭火;④向紫色石蕊试液中通入二氧化碳气体,试液变红.
A: ①②③ |
B: ①②④ |
C: ①③④ |
D: ②③④ |
一次做对,真牛!
+5奖励规则>
- 提示1:5pys6aKY6ICD5p+l5pyJ5YWz5LqM5rCn5YyW56Kz55qE5YyW5a2m5oCn6LSo44CC5rOo5oSP5r6E5riF55+z54Gw5rC055qE5Li76KaB5oiQ5YiG5piv5rCi5rCn5YyW6ZKZ44CC
- 提示2:55+z54Gw5rWG55qE5Li76KaB5oiQ5YiG5Lmf5Li65rCi5rCn5YyW6ZKZ77yM5LuW5Zyo56m65rCU5Lit5LiO5LqM5rCn5YyW56Kz5Y+N5bqU55Sf5oiQ56Kz56Kz6YW46ZKZ77yM5LqO5piv5Y+Y56Gs5bmy54el44CC
- 提示3:5LqM5rCn5YyW56Kz5LiO5rC05Y+N5bqU55Sf5oiQ56Kz6YW477yM5ZGI6YW45oCn44CC
- 答案:QQ==
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
本课配套习题挑战模式4/5
单选题
难度系数:
4.取四朵用石蕊溶液染成紫色的干燥纸花,分别进行如下操作,能够观察到纸花变红的是
A: 喷石灰水 |
B: 直接喷水 |
C: 直接放入CO2中 |
D: 喷水后放入CO2中 |
一次做对,真牛!
+5奖励规则>
- 提示1:55+z54Gw5rC05Li65rCi5rCn5YyW6ZKZ77yM5ZGI56Kx5oCn
- 提示2:5LqM5rCn5YyW56Kz5LiO5rC05Y+N5bqU5Y+v5Lul55Sf5oiQ56Kz6YW477yM5ZGI6YW45oCn44CC
- 答案:RA==
Qemhue+8jOWWt+efs+eBsOawtOaXtu+8jOeUseS6juefs+eBsOawtOWRiOeiseaAp++8jOe6uOiKseWRiOiTneiJsu+8mzxicj5C6aG577yM5rC05Li65Lit5oCn77yM55u05o6l5Za35rC05pe277yM57q46Iqx5LiN5Y+Y6Imy77ybPGJyPkPpobnvvIznlLHkuo7kuozmsKfljJbnorPlubLnh6XvvIzlubbkuI3og73kvb/nurjoirHlj5joibLvvJs8YnI+ROmhue+8jOS6jOawp+WMlueis+S4jue6uOiKseS4iueahOawtOWPjeW6lO+8jOeUn+aIkOeis+mFuO+8jOS9v+e6uOiKseWPmOS4uue6ouiJsuOAgg==
本课配套习题挑战模式5/5
单选题
难度系数:
5.取四朵用石蕊溶液染成的紫色干燥纸花进行以下实验,下列分析错误的是
实验 | ①喷洒稀盐酸 | ②喷洒水 | ③放入干燥CO2中 | ④喷水后放入CO2中 |
花的颜色 | 红色 | 紫色 | 紫色 | 红色 |
A: ①说明酸溶液可以使石蕊变红 |
B: ①④对比说明④中产生了与盐酸性质相似的物质 |
C: ②④对比说明水在石蕊变色过程中不发挥任何作用 |
D: ②③④对比说明二氧化碳能和水反应 |
一次做对,真牛!
+5奖励规则>
- 提示1:5rOo5oSP5o6n5Yi25Y+Y6YeP55qE5oCd5oOz44CC
- 提示2:5LqM5rCn5YyW56Kz5Y+q5pyJ5LiO5rC05Y+N5bqU5ZCO55Sf5oiQ56Kz6YW477yM5omN6IO95L2/55+z6JWK5Y+Y5Li657qi6Imy44CC
- 答案:Qw==
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