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（16分）某化学兴趣小组在进行钠在空气中燃烧的实验，请写出钠在氧气中燃烧的化学方程式： 。实验后，同学们发现除了得到黄色物质外，产物中还有黑色物质。兴趣小组的同学对产生的黑色固体物质进行实验探究。 查阅资料： 工业上采用铁环作阴极电解得到金属钠。实验室中金属钠的标签主要内容如下： 提出猜想： 猜想1：钠附着煤油，煤油的不完全燃烧可以生成碳单质；猜想2： 与钠反应也可以生成碳单质； 猜想3： ； 猜想4：…… 设计实验方案，验证猜想： 实验目的 实验步骤 实验现象 结论 验证猜想1 将一小块钠从煤油中直接取出加热燃烧 取出一小块切去表皮并擦干净煤油的钠加热燃烧 黑色物质中含 有碳单质 验证猜想3 黑色物质中 含有铁元素 思考与交流： 同学们了解到金属钠在石棉网上燃烧，与石棉网作用也可以生成含铁的黑色物质，请你评价钠在石棉网上燃烧探究其在空气中燃烧产物是否合理并说明原因： 。 请设计实验验证猜想2（不要求写具体操作过程）： 。
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【简答题】阅读理解。 What is blood? Blood is a thick, red fluid which carries oxygen, water and food to all parts of the body. It keeps the body at the right temperature (温度) and protects it from disease. If you los...
【单选题】Strong sandstorms are often _____ you cannot see the sun.
A.
so thick that
B.
such thick that
C.
thick in order that
D.
thick such that
【单选题】'Thick 'means()in the sentence'are you thick in your head? '
A.
stupid
B.
heavy
C.
big
D.
small
【简答题】阅读理解 Part of David's heart muscle grew thick and stiff ,keeping the flow of blood. The disease David had lived with for 17 years was slowly keeping his heart from beating. The night Flora bent forward...
【单选题】They say that blood is _____ water.
A.
more thick than
B.
thicker than
C.
more thick as
D.
thicker as
【单选题】We stayed in a quiet hotel,__ _.
A.
next to it was a thick wood
B.
next to which was a thick wood
C.
next to it there was a thick wood
D.
next to which a thick wood was
相关题目：
【单选题】'Thick 'means()in the sentence'are you thick in your head? '
A.
stupid
B.
heavy
C.
big
D.
small
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