1.Dễ
What range does the common pH scale cover?
- A0 to 14
- B1 to 10
- C0 to 100
- D−7 to +7
2.Dễ
Một nguyên tử trung hòa có 11 proton. Nó có bao nhiêu electron?
- A10
- B22
- C11
- D12
3.Dễ
What is activation energy?
- AThe total energy released once the reaction has finished
- BThe energy needed to melt a solid
- CThe minimum energy reacting particles need for a reaction to happen
- DThe energy stored in the products
4.Trung bình
Which of these is a colloid?
- APure water
- BMilk
- CSand in water
- DSalt water
5.Trung bình
For the gas reaction N₂ + 3H₂ ⇌ 2NH₃, what is the effect of increasing the pressure?
- AThe equilibrium shifts to the left, toward N₂ and H₂
- BThe NH₃ breaks down completely
- CThe equilibrium shifts to the right, toward NH₃
- DThere is no effect on the equilibrium
6.Trung bình
What is the formula of the hydroxide ion?
- AOH⁻
- BOH⁺
- CH₃O⁺
- DO²⁻
7.Khó
A solution has a hydroxide ion concentration of 1 × 10⁻³ mol/L. What is its pH at 25 °C?
- A7
- B3
- C14
- D11
8.Khó
A gas occupies 4 L at 2 atm and 200 K. What is its volume at 1 atm and 400 K?
- A16 L
- B1 L
- C4 L
- D8 L
Đáp án
- 1. A · 0 to 14
- 2. C · 11
- 3. C · The minimum energy reacting particles need for a reaction to happen
- 4. B · Milk
- 5. C · The equilibrium shifts to the right, toward NH₃
- 6. A · OH⁻
- 7. D · 11
- 8. A · 16 L
Lời giải đầy đủ từng bước: hãy luyện chủ đề này trên examproblems.com.