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Calli: Kiều Duy Long NL: Aaaaaaa=)))

cho mình hỏi:
Ca(OH)2+H2S→CaS+2H2O
(pt1)
Ca(OH)2+2H2S→Ca(HS)2+2H2O (pt2)
Trong hai pt này thì pt nào viết đúng vậy?

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36 giây trước

So sánh cao trào 1930-1931 và 1936-1939.
cái này làm sao ặ'

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Earth orbits the sun while the moon orbits Earth. Occasionally, all three of them become aligned with one another. When this happens, an eclipse occurs. There are two types of eclipses: solar and lunar. Both are rare events simply because, due to the movement of all three celestial bodies, the times when they line up with one another are infrequent. Solar eclipses are easily the more spectacular of the two. For a solar eclipse to occur, the moon's orbit must take it between Earth and the sun. While the sun is much larger than the moon, the relative nearness of the moon to Earth makes it appear to be the same size as the sun when viewed from the ground. Thus, when the sun, Earth, and moon are perfectly aligned, the moon appears to cover the entire sun. This is a solar eclipse. A solar eclipse may be either total or partial. When a total eclipse happens, the sun is completely obscured by the moon. The sky darkens, and it appears to be night time. However, most solar eclipses are partial ones. When they take place, the sun is only partly covered by the moon. When a solar eclipse happens, it is observable from a fairly small area on the planet. Thus, when there is a solar eclipse in North America, it is highly unlikely that it will be visible in Africa or Australia. A solar eclipse only lasts for a few minutes since all three heavenly bodies are in continual motion. People must also take care when viewing a solar eclipse since looking directly at it can cause damage - including blindness - to their eyes. Lunar eclipses happen when Earth moves directly between the sun and the moon. When this occurs, the planet blocks sunlight from reflecting off the moon. Lunar eclipses take place at night. During one, the moon appears very orange and is practically red in color. There are two different types of lunar eclipses. Taken together, the result is that lunar eclipses happen more frequently than solar eclipses. In addition, lunar eclipses may last for hours and can be seen from a wider area on the planet. There is no harm in directly observing a lunar eclipse either, so looking at one will not damage a person's eyes. 28. What is the passage mainly about? A. How eclipses have affected history B. Two types of eclipses C. The problems eclipses cause D. Solar eclipses 29. What is the word ‘spectacular’ in line 5 closest in meaning to? A. distinct B. impressive C. lost lasting D. common 30. Why is the moon able to cover the sun during a solar eclipse? A. Because of its large size B. Because of its brightness C. Because of its closeness to Earth D. Because of its rotation 31. Which of the following is NOT mentioned about solar eclipses? A. How they can harm people B. How long they may last C. How much of the sun cannot be seen during them D. How often they happen 32. What can be inferred from the passage about lunar eclipses? A. It is possible to see them from every-where in the world. B. They are less dangerous to people than solar eclipses. C. Superstitious people believe they bring bad luck. D. During a full moon, they can be extremely bright.

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Tìm tuyến đường gần nhất từ Bắc Giang đến Kiên Giang ?

1

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Choose the best answer.
I think you should buy ___ pack of mineral water instead. And you can also buy _ snacks such as potato crisps, 3 kilos of mandarins, 2 kilos of apples, 3 bunches of bananas, ____ cookies and soft candies.

428

428 lượt xem

1 đáp án

2 năm trước

Choose the best answer.
We should decorate our living room with _ orange banner. We also need ____ ribbons, balloons, party hats and costume.

344

344 lượt xem

1 đáp án

2 năm trước

Choose the best answer.
I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.

331

331 lượt xem

1 đáp án

2 năm trước

Calli: Kiều Duy Long NL: Aaaaaaa=)))

1 câu trả lời

cho mình hỏi:
Ca(OH)2+H2S→CaS+2H2O
(pt1)
Ca(OH)2+2H2S→Ca(HS)2+2H2O (pt2)
Trong hai pt này thì pt nào viết đúng vậy?

So sánh cao trào 1930-1931 và 1936-1939.
cái này làm sao ặ'

Tìm tuyến đường gần nhất từ Bắc Giang đến Kiên Giang ?

Choose the best answer.
I think you should buy ___ pack of mineral water instead. And you can also buy _ snacks such as potato crisps, 3 kilos of mandarins, 2 kilos of apples, 3 bunches of bananas, ____ cookies and soft candies.

Choose the best answer.
We should decorate our living room with _ orange banner. We also need ____ ribbons, balloons, party hats and costume.

Choose the best answer.
I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.

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Calli: Kiều Duy Long NL: Aaaaaaa=)))

1 câu trả lời

cho mình hỏi:Ca(OH)2+H2S→CaS+2H2O(pt1)Ca(OH)2+2H2S→Ca(HS)2+2H2O (pt2)Trong hai pt này thì pt nào viết đúng vậy?

So sánh cao trào 1930-1931 và 1936-1939. cái này làm sao ặ'

Tìm tuyến đường gần nhất từ Bắc Giang đến Kiên Giang ?

Choose the best answer.I think you should buy _____ pack of mineral water instead. And you can also buy _____ snacks such as potato crisps, 3 kilos of mandarins, 2 kilos of apples, 3 bunches of bananas, ______ cookies and soft candies.

Choose the best answer.We should decorate our living room with _____ orange banner. We also need ________ ribbons, balloons, party hats and costume.

Choose the best answer.I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.

Đề thi - đề kiểm tra Xem thêm

cho mình hỏi:
Ca(OH)2+H2S→CaS+2H2O
(pt1)
Ca(OH)2+2H2S→Ca(HS)2+2H2O (pt2)
Trong hai pt này thì pt nào viết đúng vậy?

So sánh cao trào 1930-1931 và 1936-1939.
cái này làm sao ặ'

Choose the best answer.
I think you should buy ___ pack of mineral water instead. And you can also buy _ snacks such as potato crisps, 3 kilos of mandarins, 2 kilos of apples, 3 bunches of bananas, ____ cookies and soft candies.

Choose the best answer.
We should decorate our living room with _ orange banner. We also need ____ ribbons, balloons, party hats and costume.

Choose the best answer.
I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.