1.Dễ
What is the formula of sulfuric acid?
- AH₂SO₃
- BHCl
- CHNO₃
- DH₂SO₄
Phiếu bài tập Hóa học cho kỳ thi đầu vào điều dưỡng có đáp án
2.Dễ
What is the chemical formula of carbon dioxide?
- ACO₃
- BC₂O
- CCO₂
- DCO
3.Dễ
According to collision theory, what must happen for particles to react?
- AThey must stay completely still next to each other
- BThey must both be in the solid state at the same time
- CThey must have the same mass
- DThey must collide with enough energy and the right orientation
4.Trung bình
A piece of metal has a density of 8 g/cm³ and a volume of 5 cm³. What is its mass?
- A13 g
- B0,625 g
- C40 g
- D1,6 g
5.Trung bình
Water can act as an acid in some reactions and as a base in others. What is such a substance called?
- AIsotonic
- BAmphoteric
- CNeutral
- DSaturated
6.Trung bình
What is 380 mmHg in atmospheres?
- A380 atm
- B0,5 atm
- C2 atm
- D0,38 atm
7.Khó
Which compound contains both ionic and covalent bonds?
- AMethane, CH₄
- BWater, H₂O
- CSodium chloride, NaCl
- DSodium sulfate, Na₂SO₄
8.Khó
Ethanol (CH₃CH₂OH) and dimethyl ether (CH₃OCH₃) have the same formula, C₂H₆O, but ethanol boils at a much higher temperature. Why?
- ADimethyl ether is ionic and ethanol is covalent
- BEthanol has more carbon atoms
- CEthanol molecules are heavier than dimethyl ether molecules
- DEthanol has an O–H group, so its molecules form hydrogen bonds with each other
Đáp án
- 1. D · H₂SO₄
- 2. C · CO₂
- 3. D · They must collide with enough energy and the right orientation
- 4. C · 40 g
- 5. B · Amphoteric
- 6. B · 0,5 atm
- 7. D · Sodium sulfate, Na₂SO₄
- 8. D · Ethanol has an O–H group, so its molecules form hydrogen bonds with each other
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