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• Phân tử khối của CuO là

Câu 1:

Phân tử khối của CuO là

A.

16 đvC

B.

64 đvC

C.

80 đvC

Feedback Phân tử khối của CuO là 80 đvCD.

86 đvC

Những câu hỏi này đến từ bài kiểm tra này. Bạn có muốn thực hiện bài kiểm tra thử không?

Trắc nghiệm Hóa học lớp 8 - Chất - Nguyên tử - Phân tử - Đề số 2

• 20 phút
• 10 câu hỏi

Làm bài kiểm tra

Một số câu hỏi từ cùng một bài kiểm tra

• Trong các chất dưới đây có mấy đơn chất: Cu, FeO, , CaO, Na, Ba, ZnO, CO, Mg.

• Oxit là

• Những nguyên tố tạo nên Canxi cacbonat có trong vỏ trứng là:

• Hạt nhân nguyên tử cấu tạo bởi:

• Hạt nhân nguyên tử cấu tạo bởi:

• Phân tử khối của CuO là

• Hợp chất $(NH_{2})_{x}CO$ có phân tử khối là 60 đvC. Giá trị của x là

• Trong công thức hóa học CuO, Cu có hóa trị bằng bao nhiêu

• Nguyên tố nào có nguyên tử khối là 32 đvC?

• Khi làm thí nghiệm, dùng kẹp để cặp ống nghiệm, người ta thường kẹp ở vị trí nào trên thân ống nghiệm?

Một số câu hỏi khác bạn có thể quan tâm

• Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 21 to 25.

  Many American customs will surprise you; the same thing happens to us when we (21)_______ another country. People from various cultures handle many small daily things differently. What a dull world it (22)_______ be if this were not true! Some differences are minor, and people soon become accustomed to them. At (23)_______ , for example, some foreign women may be startled at the idea of (24)_______ their hair cut or styled by men. Visitors maybe amazed to see men wearing wigs. People may find the transitory quality of much American life odd, for example, one (25)_______ rent art by the week or the entire furnishings of an apartment, from sofa and bed to the last spoon, on less than eight hours’ notice. “Package”

  Many American customs will surprise you; the same thing happens to us when we (21)_______ another country
• Trong trường hợp vì lý do kinh tế mà nhiều người lao động có nguy cơ mất việc làm, phải thôi việc thì người sử dụng lao động có trách nhiệm xây dựng phương án sử dụng lao động như thế nào?

• Experts _______ feel that they are related to the deep wishes and fears of the dreamer.

• Hỗn hợp X gồm ancol metylic và ancol no, đơn chức A. Cho 7,6 gam X tác dụng với Na dư thu được 1,68 lít H2(đktc), mặt khác oxi hóa hoàn toàn 7,6 gam X bằng CuO (to) rồi cho toàn bộ sản phẩm thu được tác dụng với dung dịch AgNO3/NH3dư thu được 43,2 gam kết tủa. Công thức cấu tạo thu gọn của A là

• Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 36 to 40.

  TATTOOING: AN ANCIENT TRADITION

  Tattooing is an old art. In ancient Greece, people who had tattoos were regarded as members of the upper classes. On the other hand, tattooing was (36) __________ in Europe by the early Christians, who thought that it was a sinful thing to do. It was not until the late 18th century, when Captain Cook saw South Sea

  Islander decorating their bodies with tattoos that attitudes began to change. Sailors came back from these islands with pictures of Christ on their backs and from then on, tattooing (37)__________ in popularity. A survey by the French army in 1881 showed that among the 387 men (38) __________there were 1,333 designs.

  Nowadays, not everybody finds tattoos acceptable. Some people thing that getting one is silly because tattoos are more or less permanent. There is also some (39) __________ about catching a blood disease from unsterilized needles. Even for those who do want a tattoo, the process of getting one is not painless, but the final result, in their eyes, is (40) __________ the pain.

  Sailors came back from these islands with pictures of Christ on their backs and from then on, tattooing (37)__________ in popularity.

• Read the following passage and mark A, B, C or D on your answer sheet to indicate the correct answer for each of the questions

  Coincident with concerns about the accelerating loss of species and habitats has been a growing appreciation of the importance of biological diversity, the number of species in a particular ecosystem, to the health of the Earth and human well-being. Much has been written about the diversity of terrestrial organisms, particularly the exceptionally rich life associated tropical rain-forest habitats. Relatively little has been said, however, about diversity of life in the sea even though coral reef systems are comparable to rain forests in terms of richness of life.

   An alien exploring Earth would probably give priority to the planet's dominants - most distinctive feature - the ocean. Humans have a bias toward land that sometimes get in the way of truly examining global issues. Seen from far away, it is easy to realize landmasses occupy only one-third of the Earth’s surface. Given that two thirds of the Earth's surface is water and that marine life lives at all levels of the ocean, the total three-dimensional living space of the ocean is perhaps 100 times greater than that of land and contains more than 90 percent of all life on Earth even though the ocean has fewer distinct species.

   The fact that half of the known species are thought to inhabit the world's rain forests doesn't seem surprising, considering the huge numbers of insects that comprise the bulk of the species. One scientist found many different species of ants in just one tree from a rain forest. While every species is different from every other species, their genetic makeup constrains them to be insects and to share similar characteristics with 750,000 species of insects. If basic, broad categories such as phyla and classes are given more emphasis than differentiating between species, then the greatest diversity of life is unquestionably by sea. Nearly every major type of plant and animal has some presentation there.

   To appreciate fully the diversity and abundance of life in the sea, it helps to think small. Every spoonful of ocean water life, on the order of 100 to 100,000 bacteria cells plus assorted microscopic plants and animals, including larvae of organisms ranging from sponges and corals to starfish and clams and much more.

  The word “there” in paragraph 3 refer to