NGuyễn Dân Huy's Profile

Phân loại và gọi tên các chất sau : CuO , MnO2 , SO3 , Al2O3 , SiO2 , MgO , P2O5 , ZnO , Na2O , N2O3 , Cr2O3 , CO2 , K2O , N2O5 , SO2 , BaO , CaO , CrO3 , NO2 , FeO , Fe2O3 .

I. Change sentences into the pasive ( Past simple) .

1. Mrs Allen wrote that novel in 1998.

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2. Nam borrowed the reference book from the shelf yesterday.

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3. The boy ate two loaves of bread last sunday.

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4. He left the letter on the desk some minutes ago.

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5. My mother bought a new bike for me last month.

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6. our form teacher returned our written test to us last lesson.

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7. The Chinese invented paper in the century. A.D

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8. Vietnamese planted trees in their neighborhood a year ago.

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9. THe children played games yesterday

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10. My sister did the housework yesterday.

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11. The publisher published his book in 1996.

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12. They repaired our desk during the weekend.

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13. JAck London wrote the novel " Martin Idon "

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I. Change sentences into the pasive ( present simple) :
1. Mr Hai delivers the letters everyday.
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2. The children often buy the tickets at the box office.
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3. They usually finish their homework before bed time.
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4. The teacher corrects our exercises today.
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5. We often watch the shows of music on TV.
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6. We do a written test today.
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7. Everyone always see the Picasso's exhibition.
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8. The workers clean the streets everyday.
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9. Careless driving causes many accidents.
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10. Weeds cover the river bank.
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để điều chế khí oxi , người ta nung KCIO3 . Sau một thời gian ta thu được 1 chất rắn và 73,56 lí khí O2 (dktc)
a. Viết phương trình phản ứng xảy ra khi nung KCIO3
b. Tính khối lượng KCIO3 ban đầu đem nung.
c. Tính khối lượng chất rắn thu được.