1.Dễ
What is the formula of methane, the main gas in natural gas?
- AC₂H₆
- BCH₄
- CCH₂
- DCO₂
Phiếu bài tập Hóa học cho kỳ thi đầu vào điều dưỡng có đáp án
2.Dễ
What is an unsaturated solution?
- AA solution that holds the maximum possible solute
- BA solution with no solute at all
- CA solution that can still dissolve more solute
- DA solution with undissolved solid at the bottom
3.Dễ
What is the normal pH range of human arterial blood?
- A7,85 to 7,95
- B7,35 to 7,45
- C7,00 to 7,10
- D6,35 to 6,45
4.Trung bình
Zn + 2HCl → ZnCl₂ + H₂ là loại phản ứng nào?
- APhản ứng hóa hợp
- BPhản ứng trao đổi kép
- CPhản ứng thế đơn
- DPhản ứng phân hủy
5.Trung bình
What is the oxidation number of sulfur in H₂SO₄?
- A+2
- B−2
- C+6
- D+4
6.Trung bình
88 g carbon dioxide (khối lượng mol 44 g/mol) có bao nhiêu mol?
- A2 mol
- B3872 mol
- C44 mol
- D0,5 mol
7.Khó
A catalyst is added to an exothermic reaction. How does the energy diagram change?
- AThe reaction becomes endothermic
- BThe products end up at a lower energy, so more heat is released
- CThe reactants start at a higher energy
- DThe peak is lower, but the energy of reactants and products stays the same
8.Khó
Why does atomic radius decrease from left to right across a period?
- AThe atoms lose electrons across the period
- BEach element adds a new electron shell
- CMore protons pull the electrons of the same outer shell closer
- DNeutrons push the electrons outward less strongly
Đáp án
- 1. B · CH₄
- 2. C · A solution that can still dissolve more solute
- 3. B · 7,35 to 7,45
- 4. C · Phản ứng thế đơn
- 5. C · +6
- 6. A · 2 mol
- 7. D · The peak is lower, but the energy of reactants and products stays the same
- 8. C · More protons pull the electrons of the same outer shell closer
Lời giải đầy đủ từng bước: hãy luyện chủ đề này trên examproblems.com.