问题 选择题

下列A~D四组,每组有两个反应,其中两个反应可用同一个离子方程式表示的是(  )

(I)(II)
A将少量浓氨水滴入Al2(SO)4溶液将少量Al2(SO43溶液滴入浓氨水
B将少量SO2通入Ba(OH)2溶液将过量SO2通入少量Ba(OH)2溶液
C将0.1mol Cl2通入含0.2molFeBr2的溶液中将0.3mol Cl2通入含0.2mol FeBr2溶液
D将过量BaCl2溶液与少量Na2SO4溶液相混合将少量Ba(OH)2溶液与过量MgSO4溶液相混合

A.A

B.B

C.C

D.D

答案

A、将少量浓氨水滴入Al2(SO)4溶液和将少量Al2(SO43溶液滴入浓氨水可以用同一离子方程式表示,Al3++3NH3•H2O=Al(OH)3↓+3NH4+;故A正确;

B、将少量SO2通入Ba(OH)2溶液生成亚硫酸钡沉淀,将过量SO2通入少量Ba(OH)2溶液生成亚硫酸氢钡,无沉淀生成,故B错误;

C、将0.1mol Cl2通入含0.2molFeBr2的溶液中,发生反应为2Fe2++Cl2=2Fe3++2Cl-;将0.3mol Cl2通入含0.2mol FeBr2溶液反应为2Fe2++4Br-+3Cl2=2Fe3++2Br2+6Cl-;故C错误;

D、将过量BaCl2溶液与少量Na2SO4溶液相混合离子方程式为Ba2++SO42-=BaSO4↓,将少量Ba(OH)2溶液与过量MgSO4溶液相混合反应的离子方程式为Ba2++Mg2++2OH-+SO42-=BaSO4↓+Mg(OH)2↓,故D错误;

故选A.

完形填空

Stop eating yourself stupid we all know that poor nutrition can lead to bad health and even weight gain. Now add “lack of intelligence” to the growing list. A recent study has found that what you eat could very likely play a role in how smart you are.

According to the study, rats fed a high-fat diet for 10 days showed signs of weakness and even had trouble finding food that was waiting for them.小题1: Actually a high-fat diet could weaken our intelligence--but so can a low-calorie diet. The trick appears to lie in finding a nice balance.

Here are ways to achieve that happy balance and make you smarter through diet, exercise and improving your brain power.

Figure out how many calories you need to maintain your weight. __小题2:__ If you need to drop a few pounds, take away the number you get by 400 calories; consume that number of calories each day until you drop the weight.

__小题3:__Aim for healthy foods that include good amounts of protein, fiber, fruits and vegetables, healthy whole grains, healthy fats and plenty of water. Well! Remember: All work and no play makes Jack a dull boy. Read a book. Try a new recipe. Do some puzzles. __小题4:__

Exercise regularly with a positive attitude. Aim for at least three 30-minute training sessions a week(but more is better). I like simple exercise such as walking, but anything that raises the heart rate is good. _小题5:_  Combine them! Some people like to listen to classical music such as Bach or Mozart, but rock music lovers will be happy to learn that this kind of music can help make them smarter as well.

A.You may be fond of music, too.

B.Your health depends on your exercise plan.

C.Aim to get this number of calories each day.

D.Don’t forget to exercise your mind while doing so.E.You may be wondering what this has to do with us.

F.These are all good ways to help increase your intelligence.

G.Eat the right foods in addition to getting the right number of calories.

选择题