【名词&注释】
化学反应(chemical reaction)、高锰酸钾(potassium permanganate)、动词不定式(infinitive)、质量守恒定律(law of conservation of mass)、不符合(inconformity)、生成物(resultant)、固体剩余物
[单选题]下列对化学反应前后质量变化的解释,不符合质量守恒定律的是
A. 高锰酸钾受热分解后固体剩余物的质量减小,是因为放出了氧气
B. 蜡烛燃烧后质量变小,是因为蜡烛受热形成了石蜡蒸气
C. 细铁丝在氧气中燃烧后,质量增大,是因为生成物(resultant)中含有氧的质量
D. 白磷在密闭容器中燃烧,反应前后总质量不变,是因为生成物(resultant)都没有逸散
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学习资料:
[单选题]_____________
A. find
B. sell
C. buy
D. make
[单选题]--Whydidn'tyougotothecinemawithusthisafternoon?--I______atthestationformyunclefromBeijing.
A. waswaiting
B. havewaited
C. amwaiting
D. willwait
[单选题]2. She prefers _______ go by train _______ by air.
A. to; rather
B. to; rather than
C. /; rather than
D. /,rather
[单选题]I found _________ really difficult for me to guess the meaning of the word.
A. this
B. it
C. that
D. one
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