Viết các PTHH theo dãy chuyển hóa sau

a/ Cu ➜ CuO ➜ CuCl₂ ➜ CuSO₄ ➜ Cu(OH)₂ ➜ CuO ➜ Cu ➜CuCl₂ ➜ Cu(OH)₂

b/ Al ➜ AlCl₃ ➜ Al(OH)₃ ➜ Al₂O₃ ➜ Al(NO₃)₃ ➜ Al

Có các oxit sau: SO₂ ; SiO₂ ; CaO ; Fe₃O₄ ; P₂O₅ . Hãy cho biết những oxit nào tác dụng với

a/ Nước b/ axit clohidric c/ dd kalihidroxit

Viết PTPƯ xảy xa

Cho tứ giác ABCD có AB = 2 cm, AD = 3 cm, BD = 6 cm, CD = 8 cm. Chứng minh ABCD là hình thang.

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.

You may have heard that tomatoes and processed tomato product like tomato sauce and canned tomatoes protect (31)______ some types of cancer. The cancer-preventing properties of tomato products have been (32)______ to lycopene. It is a bright red pigment found in tomatoes and other red fruits and is the cause of their red color. Unlike other fruits and vegetables, where nutritional content such as vitamin C is diminished upon cooking, processing of tomatoes increases the concentration of lycopene. Lycopene in tomato paste is four times (33)______ in fresh tomatoes. This is because lycopene is insoluble in water and is tightly bound to vegetable fiber. Thus, (34)______ tomato products such as pasteurized tomato juice, so up, sauce, and ketchup contain the highest concentrations of lycopene. Cooking and crushing tomatoes as in the canning process and serving in oil-rich dishes such as spaghetti sauce or pizza (35)______ increase assimilation from the digestive tract into the bloodstream. Lycopene is a fat-soluble substance, so the oil is said to help absorption to a great extent.

Question 32

A. pressed

B. responsible

C. attributed

D. original