Các chất mà phân tử không phân cực 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 33 to 37. Fill in the appropriate word in question 33

AS OLD AS YOU FEEL

It might after all be true that you are only as old as you feel. A British clinic is carrying out new high-tech tests to calculate the “real” biological age of patients (33) ______ on the rate of physical deterioration. Information on every aspect of a patient’s health, fitness, lifestyle and family medical history is (34) ______ into a computer to work out whether they are older or younger than their calendar age suggests.

The availability and increasing accuracy of the tests has prompted one leading British gerontologist to call for biological age to be used to determine when workers should retire. He (35) ______ that if an employee’s biological or “real” age is shown, for example, to be 55 when he reaches his 65th birthday, he should be incited to work for another decade. Apparently most employers only take into (36) ______ a person’s calendar years, and the two may differ considerably. Some of those prepared to pay a substantial sum of money for the examinations will be able to smugly walk away with medical evidence showing that they really are as young as they feel, giving them the confidence to act and dress as if they were younger. Dr Lynette Yong, resident doctor at the clinic where the tests are offered claims that the purpose of these tests will be to motivate people to (37) _______ their health.

The concept of “real” age is set to become big business in the USA with books and websites helping people work out whether their body is older or younger than their years. Others firmly believe that looks will always be the best indicator of age. 

A. prospect

B. arranged

C. based

D. established

Hòa tan hoàn toàn 2,7 gam Al vào dung dịch H₂SO₄ loãng, thu được V lít khí (đktc). Giá trị của V là

A. 2,24.

B. 3,36.

C. 4,48.

D. 6,72.

Phản ứng nào sau đây là phản ứng trao đổi ion trong dung dịch?

Cho phản ứng sau: F e ( O H ) 2 + H N O 3 - > F e ( N O ₃ ) 3 + N x O y + H 2 O Sau khi cân bằng, tổng hệ số tối giản của chất tham gia và chất tạo thành sau phản ứng là

A. 39x - l5y + 1

B. 20x – l6y

C. 34x + l5y

D. 39x + l5y

Cho các phản ứng hóa học sau:

(1) BaCl₂ + H₂SO₄

(2) Ba(OH)₂ + Na₂SO₄

(3) Ba(OH)₂ + (NH₄)₂SO₄

(4) Ba(OH)₂ + H₂SO₄

(5) Ba(NO₃)₂ + H₂SO₄

Số phản ứng có phương trình ion thu gọn: Ba²⁺ +SO₄^2-→BaSO₄ là

A. 4

B. 3

C. 5

D. 2