Yếu tố nào sau đây quyết định mọi hoạt động của xã hội?

Bốn kim loại Na; Al; Fe và Cu được ấn định không theo thứ tự X, Y, Z, T biết rằng: • X; Y được điều chế bằng phương pháp điện phân nóng chảy • X đẩy được kim loại T ra khỏi dung dịch muối • Z tác dụng được với dung dịch H2SO4 loãng nhưng không tác dụng được với dung dịch H2SO4 đặc nguội. X, Y, Z, T theo thứ tự là:         

Read the following passage and blacken the letter A, B, C or D on your answer sheet to indicate the correct word for each of the blanks in the following questions:

Dining Etiquette in Japan: An honored guest sits at the centre of the table furthest from the door and begins eating first. Learn to (1)_____chopsticks - never point them, never pierce food with them, and rest them on the chopstick-rest when breaking (2)_____drink or chat. It is good etiquette to try a bit of everything.
Dining Etiquette in Turkey: Meals are a (3)_____affair, conversations are friendly and loud. The head of the family of honored guest is served first. It is good etiquette to insist the most senior is served first (4)_____of you. Asking for (5)_____food is a compliment. If taken to a restaurant, Turkish dining etiquette has strict rules that the one who extended the invitation must pay.

Question 4:

Cho 15 gam hỗn hợp bột kim loại Zn và Cu vào dung dịch HCl (dư). Sau khi phản ứng xảy ra hoàn toàn, thu được 4,48 lít khí H2 (đktc) và m gam kim loại không tan. Giá trị của m là         

Read the following passage and blacken the letter A, B, C or D on your answer sheet to indicate the correct word for each of the blanks in the following questions:

Dining Etiquette in Japan: An honored guest sits at the centre of the table furthest from the door and begins eating first. Learn to (1)_____chopsticks - never point them, never pierce food with them, and rest them on the chopstick-rest when breaking (2)_____drink or chat. It is good etiquette to try a bit of everything.
Dining Etiquette in Turkey: Meals are a (3)_____affair, conversations are friendly and loud. The head of the family of honored guest is served first. It is good etiquette to insist the most senior is served first (4)_____of you. Asking for (5)_____food is a compliment. If taken to a restaurant, Turkish dining etiquette has strict rules that the one who extended the invitation must pay.

Question 3:

Khi nhúng thanh Mg có khối lượng m gam vào dung dịch hỗn hợp X chứa a mol Cu(NO3)2 và b mol HCl ta có đồ thị biểu diễn sự phụ thuộc của khối lượng Mg vào thời gian phản ứng được biểu diễn như hình vẽ dưới đây:    Sau khi phản ứng xảy ra hoàn toàn rút thanh Mg ra, thu được NO là sản phẩm khử duy nhất của . Tỉ lệ a : b là         

Read the following passage and blacken the letter A, B, C or D on your answer sheet to indicate the correct word for each of the blanks in the following questions:

Dining Etiquette in Japan: An honored guest sits at the centre of the table furthest from the door and begins eating first. Learn to (1)_____chopsticks - never point them, never pierce food with them, and rest them on the chopstick-rest when breaking (2)_____drink or chat. It is good etiquette to try a bit of everything.
Dining Etiquette in Turkey: Meals are a (3)_____affair, conversations are friendly and loud. The head of the family of honored guest is served first. It is good etiquette to insist the most senior is served first (4)_____of you. Asking for (5)_____food is a compliment. If taken to a restaurant, Turkish dining etiquette has strict rules that the one who extended the invitation must pay.

Question 5:  

Cho dãy các kim loại: Mg, Cu, Fe, Ag. Số kim loại trong dãy phản ứng được với dung dịch HCl loãng là  

Read the following passage and blacken the letter A, B, C or D on your answer sheet to indicate the correct word for each of the blanks in the following questions:

Dining Etiquette in Japan: An honored guest sits at the centre of the table furthest from the door and begins eating first. Learn to (1)_____chopsticks - never point them, never pierce food with them, and rest them on the chopstick-rest when breaking (2)_____drink or chat. It is good etiquette to try a bit of everything.
Dining Etiquette in Turkey: Meals are a (3)_____affair, conversations are friendly and loud. The head of the family of honored guest is served first. It is good etiquette to insist the most senior is served first (4)_____of you. Asking for (5)_____food is a compliment. If taken to a restaurant, Turkish dining etiquette has strict rules that the one who extended the invitation must pay.

Question 2:

Hòa tan hoàn toàn 7,8 gam hỗn hợp gồm Mg và Al vào dung dịch HCl  dư. Sau phản ứng thấy khối lượng dung dịch tăng lên 7,0 gam. Số mol axit HCl đã tham gia phản ứng trên là          

Hoà tan hoàn toàn 6,5 gam Zn bằng dung dịch H₂SO₄ loãng, thu được V lít H₂ (đktc). Gía trị V là: