Phiếu bài tập Hóa học cho kỳ thi đầu vào điều dưỡng có đáp án

What is an electrolyte?

1. AA substance that forms ions and conducts electricity when dissolved in water
2. BA metal that conducts electricity as a solid
3. CA substance that dissolves as whole molecules without forming any ions
4. DA gas that dissolves in blood

What does the rule "like dissolves like" mean?

1. AOnly substances with identical formulas can ever dissolve in each other
2. BPolar solvents dissolve polar substances, and nonpolar solvents dissolve nonpolar ones
3. CEvery substance dissolves in water
4. DSolids dissolve only in other solids

What is the change from a gas directly to a solid, skipping the liquid state, called?

1. AFreezing
2. BDeposition
3. CSublimation
4. DCondensation

How much heat is needed to raise the temperature of 100 g of water by 10 °C (specific heat of water = 4,18 J/g·°C)?

1. A418 J
2. B41,8 J
3. C4180 J
4. D41,800 J

Which statement describes a saturated fat?

1. AIts fatty acid chains have no carbon–carbon double bonds
2. BIts fatty acid chains have many carbon–carbon double bonds
3. CIt is always liquid at room temperature
4. DIt contains no carbon atoms

What is the shape of a water molecule?

1. ATetrahedral
2. BBent
3. CLinear
4. DFlat triangle

Một mẫu chứa 3,01 × 10²³ phân tử nước. Đó là bao nhiêu mol?

1. A0,5 mol
2. B3,01 mol
3. C1,81 mol
4. D2 mol

Cotton soaked in ammonia (NH₃) and cotton soaked in hydrogen chloride (HCl) are placed at opposite ends of a glass tube. A white ring of ammonium chloride forms closer to the HCl end. What does this show?

1. AThe HCl molecules diffuse faster than NH₃ molecules
2. BThe lighter NH₃ molecules diffuse faster than HCl molecules
3. CThe white ring forms where the gases are heaviest
4. DBoth gases diffuse at the same speed