1.Dễ
Chlorine, bromine và iodine là ví dụ của nhóm nào?
- AHalogen
- BKhí hiếm
- CKim loại kiềm
- DKim loại chuyển tiếp
2.Dễ
Tính chất nào là điển hình của kim loại?
- ADẫn điện tốt
- BDẫn nhiệt kém
- CPhần lớn là chất khí ở nhiệt độ phòng
- DLà chất rắn giòn, dễ vỡ vụn
3.Dễ
What are the building blocks (monomers) of proteins?
- ASimple sugars
- BAmino acids
- CFatty acids
- DNucleotides
4.Trung bình
In the ideal gas law, PV = nRT, what does n stand for?
- AThe density of the gas
- BThe number of molecules of gas
- CThe number of atoms per molecule
- DThe number of moles of gas
5.Trung bình
A bag of 5% (w/v) glucose solution (called 5% dextrose in the US) contains 5 g of glucose per 100 mL. How many grams of glucose are in 1 L?
- A500 g
- B5 g
- C0,5 g
- D50 g
6.Trung bình
How many covalent bonds does a carbon atom usually form?
- A1
- B2
- C4
- D3
7.Khó
Cells oxidise glucose to CO₂ and water, as burning glucose does. How does cellular respiration differ from burning?
- AIt produces different products from burning
- BIt does not need oxygen at any stage
- CIt releases much more total energy than burning the same glucose
- DIt releases the energy in many small, enzyme-controlled steps
8.Khó
Why does drinking seawater make dehydration worse?
- ASeawater contains no water molecules the body can use
- BSeawater is hypertonic, so the body loses extra water getting rid of the salt
- CSeawater is isotonic, so it cannot be absorbed
- DSeawater is hypotonic, so water rushes into cells and makes them burst
Đáp án
- 1. A · Halogen
- 2. A · Dẫn điện tốt
- 3. B · Amino acids
- 4. D · The number of moles of gas
- 5. D · 50 g
- 6. C · 4
- 7. D · It releases the energy in many small, enzyme-controlled steps
- 8. B · Seawater is hypertonic, so the body loses extra water getting rid of the salt
Lời giải đầy đủ từng bước: hãy luyện chủ đề này trên examproblems.com.