giải thích chi tiết giúp em với ạ

giúp em những câu đánh dấu ạ giait thích nữa an

Giải chi tiết giúp em với ạ. Em cảm ơn ạ

cho 9,6g hỗ hợp 2 kim loại ca và fe tác dụng với dung dịch hcl 2m(dư) thu được 8,8g khí hidro tìm khối lượng fe trong hỗn hợp và thể tích axit đã phản ứng

3 câu trắc nghiệm = 20 đ nè. Giúp mik vs, cần gấp

In 79 A.D., the ancient Roman city of Pompeii was destroyed by the eruption of a nearby volcano, Mt. Vesuvius. Although many other cities in history have been victims to eruptions of volcanoes and their deadly gas, lava, and ash, what makes Pompeii especially interesting is what happened years later. In 1748, explorers in the Italian region where Pompeii once stood made an incredible discovery. Buried underneath layers of dirt, the city of Pompeii remained preserved. The original volcanic explosion had happened so quickly that most of the citizens were unable to escape. Their remains and the buildings of the city were still there, preserved, as if the year was still 79 A.D. instead of 1748. Some were frozen as if running from the fiery inferno while others were engaged in normal daily activities. The layers of dust had frozen the day in history. Archeologists would later begin the careful process of excavating the now famous city from the layers of ash. The tragedy of Pompeii is the loss of the city and the approximately two thousand people who died during the eruption. Ironically, the deadly eruption helped preserve Pompeii so that no one will ever forget the name of this ancient Roman civilization. 21. What was the author's purpose in writing this text? A. To inform B. To entertain C. To persuade D. To explain 22. What conclusion can be drawn about the people of Pompeii in the year 79 A.D.? A. Most of the citizens were farmers. B. Women and men were treated equally. C. The citizens of Pompeii were not prepared for the eruption of Mt. Vesuvius. D. The people of Pompeii were unconcerned about living near an active volcano. 23. Using the information from the text, what can you infer an archeologist might do as part of his or her job? A. Study modern events to better understand connections to the past. B. Teach history at the university level. C. Create buildings that have similar architectural designs of the past. D. Excavate and study past civilizations and their artifacts. 24. The underlined word "Some" in the text refers to some ………………. A. citizens B. remains C. buildings D. activities 25. Which of the following can be proven true from the information given in the text? A. Archaeologists believe Pompeii is the greatest historical discovery of its kind. B. The 1748 discovery of Pompeii is considered a significant historical discovery. C. All of the citizens of Pompeii could have survived if they had been given warning. D. Mt. Vesuvius will erupt again within the next ten years.

Mng giúp em với cần gấp sẽ đánh giá 5 sao Giúp em bài 2 ạ em cảm ơn

Cho ph­¬ng tr×nh : x2 - 2(m - 1 ) x + 2m2 + 1 = 0 a) Gi¶i ph­¬ng tr×nh víi m = - 4 b) Víi gi¸ trÞ nµo cña m th× ph­¬ng tr×nh cã hai nghiÖm ph©n biÖt

(Chia dạng đúng của từ) 1. He tried to look _____., but it didn't work (apology) 2. The tension in the room seemed _____ .(endure) 3. Silk is always wonderful too, even if it's totally____. (practice) 4. His battle against cancer has ____his belief in God. (strong) 5. The music was _____loud, you couldn't hear yourself think. (believe) 6. I thought he was being _______with me, not rushing me.(consider) 7. The question of whether he was ____remained for trial.(neglect) 8. All this she heard, even understood, but still she was ______(speak) 9. He admired the _____of relationships he saw around him. (warm) 10. Some of the houses on the hillside are _____to cars.(access)

Mng giúp mình nha. Mình đang cần gấp ạ