Sục khí CO2 dư vào dung dịch chứa KOH và KAlO2

Thực hiện các thí nghiệm sau ở nhiệt độ phòng: [1]. Nhỏ dung dịch Na2CO3 loãng tới dư vào dung dịch Al[NO3]3. [2]. Nhỏ từ từ dung dịch NaOH tới dư vào dung dịch ZnSO4. [3]. Cho KOH vào dung dịch Ca[HCO3]2. [4]. Sục khí H2S vào dung dịch KMnO4 trong môi trường H2SO4 loãng. [5]. Cho CH2=CH-CH3 tác dụng với dung dịch KMnO4. [6]. Sục khí CO2 dư vào dung dịch C6H5ONa. [7]. Cho dung dịch AgNO3 tác dụng dung dịch H3PO4. Số thí nghiệm sau khi kết thúc phản ứng có kết tủa tạo ra là:

Nung m gam hỗn hợp X gồm KHCO3 và CaCO3 ở nhiệt độ cao đến khối lượng không đổi thu được chất rắn Y. Cho Y vào H2O dư thu được 0,2m gam chất rắn Z và dung dịch E. Nhỏ từ từ dung dịch HCl 1M vào E, khi khí bắt đầu thoát ra cần dùng V1 lít dung dịch HCl và khi khí thoát ra vừa hết thì thể tích dung dịch HCl đã dùng là V2 lít. Tỉ lệ V1 : V2 tương ứng là:

Cho các thí nghiệm sau:

[a] Cho dung dịch Al[NO3]3 tác dụng với dung dịch NH3 dư

[b] Cho dung dịch KOH dư vào dung dịch AlCl3

[c] Cho dung dịch HCl dư vào dung dịch NaAlO2

[d] Dẫn khí CO2 dư vào dung dịch KAlO2

Số thí nghiệm thu được kết tủa khi phản ứng kết thúc là:

Thực hiện các thí nghiệm sau: [1]Sục khí CO2 dư vào dung dịch Ca[OH]2. [2]Sục khí NH3 dư vào dung dịch AlCl3. [3] Sục khí CO2 dư vào dung dịch NaAlO2. [4]Cho dung dịch AgNO3 vào dung dịch FeCl3. [5]Cho dung dịch HCl vào dung dịch K2SiO3. [6]Cho ure vào dung dịch Ca[OH]2. Sau khi kết thúc thí nghiệm, số trường hợp thu được kết tủa là:

Tiến hành các thí nghiệm sau: [1]. Cho dung dịch chứa 3a mol NaOH vào dung dịch chứa a mol AlCl3. [2]. Cho a mol Fe3O4 vào dung dịch chứa 5a mol H2SO4 loãng. [3]. Cho khí CO2 đến dư vào dung dịch Ca[OH]2. [4]. Cho Cu vào dung dịch Fe2[SO4]3 dư. [5]. Cho dung dịch chứa a mol KHSO4 vào dung dịch chứa a mol NaHCO3. [6]. Cho Al vào dung dịch HNO3 dư [Sản phẩm khử duy nhất là NO]. Sau khi các phản ứng xảy ra hoàn toàn, số thí nghiệm thu được dung dịch chứa 2 muối là:

Để phân biệt các dung dịch riêng biệt: NaCl, MgCl2, AlCl3, FeCl3, có thể dùng dung dịch :

Hòa tan hoàn toàn 21,5 gam hỗn hợp X gồm Al, Zn, FeO, Cu[NO3]2 cần dùng hết 430 ml dung dịch H2SO4 1M thu được hỗn hợp khí Y [đktc] gồm 0,06 mol NO và 0,13 mol H2, đồng thời thu được dung dịch Z chỉ chứa các muối sunfat trung hòa. Cô cạn dung dịch Z thu được 56,9 gam muối khan. Thành phần phần trăm của Al trong hỗn hợp X có giá trị gần nhất 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 31 to 35:

The warming of the Pacific Ocean has created weather pattern [31]_______ strongly affect the world. When the water is warm, the amount of rainfall in Indonesia and the surrounding regions decreases. Australia could [32]_______ experience a drought in many parts. On the other hand, Chile [which borders the Pacific Ocean] is preparing for severe rainstorms. In Pakistan and northwestern India, the weather pattern makes the rainy season weaker and makes the area much drier. This happening is called El Nino and is used [33]_______ weather forecasters to make long-range weather predictions. They also know that El Nino will bring unusually rain to the southwestern part of the United States and make the central part of the country drier at the same time. According to research, weather forecasters [34]_______ know about the coming weather with certainty. Now everything has become completely different. El Nino itself used to be predictable. It would occur every two to seven years. But now this weather pattern is becoming more frequent. We cannot say when and how often tornadoes or cyclones occur. Scientists are unsure of the reason for this [35]_______ on the global scale either.

Question 32:

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 31 to 35:

The warming of the Pacific Ocean has created weather pattern [31]_______ strongly affect the world. When the water is warm, the amount of rainfall in Indonesia and the surrounding regions decreases. Australia could [32]_______ experience a drought in many parts. On the other hand, Chile [which borders the Pacific Ocean] is preparing for severe rainstorms. In Pakistan and northwestern India, the weather pattern makes the rainy season weaker and makes the area much drier. This happening is called El Nino and is used [33]_______ weather forecasters to make long-range weather predictions. They also know that El Nino will bring unusually rain to the southwestern part of the United States and make the central part of the country drier at the same time. According to research, weather forecasters [34]_______ know about the coming weather with certainty. Now everything has become completely different. El Nino itself used to be predictable. It would occur every two to seven years. But now this weather pattern is becoming more frequent. We cannot say when and how often tornadoes or cyclones occur. Scientists are unsure of the reason for this [35]_______ on the global scale either.

Question 31:

Mark the letter A, B, C or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions:

The plan may be ingenious. It will never work in practice.

Mark the letter A, B, C or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions:

She wasn’t wearing a seat-belt. She was injured.

Mark the letter A, B, C or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions:

A waitress served us. She was very impolite and impatient.

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions:

Everyone was watching the little dog. They were greatly amused at it.

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions:

The agreement ended six-month negotiation. It was signed yesterday.

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 31 to 35:

A typical person needs about 1,800 calories per day to stay running. They keep yourorgans operating [31] ________ and your brain running. They also keep your body warm.A person gains weight because he or she consumes more calories per day than necessary. The only way to lose fat is to reduce the number of calories that you consume per day. This is the basic principle [32] ________ going on a diet. Unfortunately, diets don't work for most people. They do lose weight but then go off the diet and put it back. Building a sensible diet and exercise plan is the key to maintaining a consistent weight. You need to figure out how many caloriesyou need in a day and how many you actually [33] ________. The next step is to addexercise so that you can raise the number of calories you can consume per day. Burning 250 or 500 calories per day can make a big [34] ________. You can ridean exercise bike while you are watching television or you can take the stairs instead of the elevator. Find an exercise partner. Exercises can be a lot easier if there issomeone to talk to. It’s a good idea to wear firm fitting clothes if you are [35] ________. Tight clothing acts as a reminder of what you are trying to accomplish.

Question 33:

Mark the letter A,B,C or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions:

Women still cover their heads in some countries. They did so in the past.