回忆课堂教学中老师做过的演示使用：硫在氧气里燃烧．
①硫在氧气里燃烧发出______色火焰；
②反应的方程式______；
③计算0.16g硫在氧气里完全燃烧，理论上可生成二氧化硫的质量为______g（计算结果精确到0.01）
①硫在氧气中燃烧的现象是产生明亮的蓝紫色火焰，放热，生成一种无色有刺激性气味的气体；
②一写二配三注明四等号：反应物是硫和氧气生成物是二氧化硫，反应条件是点燃；
③由于二氧化硫中硫元素和氧元素的质量比为1：1所以参加反应的氧气质量也是0.16g，所以生成二氧化硫的质量为0.16×2═0.32g．
故答案为：（1）明亮的蓝紫
（2）S+O2
SO2 点燃 .
（3）0.32g
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All birds are warm-blooded. This means that their body temperature always stays the same. Birds breathe with lungs. A bird's body is covered with feathers. All birds have two wings. Baby birds are hatched from eggs. Birds can see very well. They can't move their eyeballs like people do, so they have to turn their heads to look at something. Birds' ears are round holes on the sides of their heads. There are about 9, 000 kinds of birds in the world. 1. There are over ____________ kinds of birds in the ____________. 2. Birds don't have ears like people do. Their ears are ____________ ____________ on the sides of their heads. 3. Birds can't move their ____________ so they have to turn their ____________ to look at something. 4. Birds have hundreds of ____________ but only two ____________ and ____________ wings. |