题干

氧元素是地壳中含量最高的元素,请回答下列问题.

(1)元素周期表中氧元素的信息如图1所示,从图中能直接获得的信息是____ .

A.氧元素属于非金属元素

B.氧原子核内的质子数为16

C.氧元素有O2和O3两种单质

(2)图2是硫化氢(H2S)在氧气中不完全燃烧反应的微观示意图.写出该反应的化学方程式____ .

上一题 下一题 0.0难度 选择题 更新时间:2019-10-16 11:02:40

答案(点此获取答案解析)

A,2H2S+O22H2O+2S

同类题2

任务型阅读

    If you want to keep fit, please refer to the following:

    Move More

    Make it a daily habit to find ways to move your body.____ Climb stairs instead of taking the lift. Walk your dog; play with your kids. It doesn't have to be an hour in the gym or a 45-minute dance class. But that's great when you're up to it. At the same time, move more.

    Give up Smoking

    Ever since 1960 when it was announced that smoking was harmful to health, Americans have been reducing their use of tobacco products. Just recently, we've seen more and more teens smoking. Could it be the Hollywood influence?____Take care! Warn your children against smoking.

    ____

    While recent studies show a glass of wine or one drink a day can help protect against heart disease, more than that can cause other health problems such as liver and kidney disease and cancer.

    Reduce Stress

    Easier said than done. Stress comes in many ways.____Spend 30 minutes a day doing something you like such as walking on the beach or in a park, reading a good book, visiting a friend, listening to relaxing music, and watching a funny movie.

    Protect Yourself from Pollution

    If you can't live in a smog-free environment, at least avoid smoke-filled rooms.____Exercise indoors in air conditioning when air quality is good.

A. Avoid Overdrinking

B. There are many things you can do to move your arms and legs.

C. Think carefully before doing something.

D. Exercise outside when the smog(雾霾)rating is low.

E. It seems that the stars in every movie smoke cigarettes.

G. It's important to reduce it.