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

What is absolute zero?

1. A0 K, about −273 °C, the lowest possible temperature
2. B0 °C, the point at which pure water freezes into ice
3. C−100 °C, the coldest temperature on Earth
4. D0 °F, the temperature of a salt and ice mixture

What is an alloy?

1. AA compound formed when a metal reacts with oxygen
2. BA nonmetal that conducts electricity
3. CA pure metal in its natural state
4. DA mixture of a metal with one or more other elements

What is a solution?

1. AA mixture in which particles settle out on standing
2. BA solid that has been melted
3. CA pure compound made of two elements
4. DA mixture that is the same throughout (homogeneous)

During digestion, large molecules are broken down by adding water across their bonds. What is this reaction called?

1. ACombustion
2. BPolymerisation
3. CCondensation
4. DHydrolysis

Why does ice float on liquid water?

1. AIce is denser than liquid water
2. BIce contains trapped air from the freezer
3. CIce has a higher mass than the same volume of water
4. DIce is less dense than liquid water

A plastic block has a density of 0,8 g/cm³. What happens when it is placed in water (density 1,0 g/cm³)?

1. AIt dissolves
2. BIt sinks
3. CIt floats
4. DIt stays suspended halfway down

Phản ứng nào sau đây là phản ứng trung hòa?

1. AH₂SO₄ + 2KOH → K₂SO₄ + 2H₂O
2. B2H₂O → 2H₂ + O₂
3. CZn + CuSO₄ → ZnSO₄ + Cu
4. DCH₄ + 2O₂ → CO₂ + 2H₂O

Vitamin C is water-soluble and vitamin D is fat-soluble. What does this suggest about their molecules?

1. AVitamin C is nonpolar, while vitamin D is strongly polar
2. BVitamin C is polar, while vitamin D is mostly nonpolar
3. CBoth are ionic compounds
4. DBoth are equally polar