1.Dễ
What is a horizontal row of the periodic table called?
- AA block
- BA period
- CA group
- DA family
2.Dễ
What is a hydrocarbon?
- AA carbon atom with a positive charge
- BAny compound that dissolves in water
- CA compound made of hydrogen and oxygen
- DA compound made of only hydrogen and carbon
3.Dễ
A cleaning solution has a pH of 12. How is it described?
- AStrongly acidic
- BNeutral
- CWeakly acidic
- DStrongly basic
4.Trung bình
Why does oxygen move from the alveoli of the lungs into the blood?
- AThe partial pressure of oxygen is higher in the blood than in the alveoli
- BThe partial pressure of oxygen is higher in the alveoli than in the blood
- COxygen is heavier than carbon dioxide
- DOxygen is pumped actively into the blood
5.Trung bình
According to the Brønsted–Lowry definition, what is an acid?
- AA proton (H⁺) donor
- BAn electron pair donor
- CA hydroxide ion donor
- DA proton (H⁺) acceptor
6.Trung bình
How many covalent bonds does a carbon atom usually form?
- A3
- B4
- C2
- D1
7.Khó
What fraction of a radioactive isotope remains after three half-lives?
- A1/6
- B1/8
- C1/3
- D1/9
8.Khó
Một chất khí ở 1 atm trong bình 6 L. Ở cùng nhiệt độ, nó được nén xuống 2 L. Áp suất mới là bao nhiêu?
- A3 atm
- B4 atm
- C12 atm
- D0,33 atm
Đáp án
- 1. B · A period
- 2. D · A compound made of only hydrogen and carbon
- 3. D · Strongly basic
- 4. B · The partial pressure of oxygen is higher in the alveoli than in the blood
- 5. A · A proton (H⁺) donor
- 6. B · 4
- 7. B · 1/8
- 8. A · 3 atm
Lời giải đầy đủ từng bước: hãy luyện chủ đề này trên examproblems.com.