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

Nhóm nào chứa các khí hiếm, như helium và neon?

1. ANhóm 17
2. BNhóm 2
3. CNhóm 18
4. DNhóm 1

Which electrons take part in chemical bonding?

1. AOnly the electrons in the first shell
2. BThe valence (outermost) electrons
3. CThe electrons closest to the nucleus
4. DAll electrons take part equally

Which state of matter has a fixed volume but takes the shape of its container?

1. ALiquid
2. BGas
3. CSolid
4. DPlasma

What is the molar mass of sodium chloride, NaCl (Na = 23, Cl = 35,5 g/mol)?

1. A12,5 g/mol
2. B23 g/mol
3. C81,5 g/mol
4. D58,5 g/mol

Which coefficients balance __KClO₃ → __KCl + __O₂?

1. A2, 1, 3
2. B1, 1, 3
3. C1, 1, 1
4. D2, 2, 3

When the diaphragm contracts and the chest cavity gets bigger, what happens to the air pressure inside the lungs?

1. AIt falls, so air flows in
2. BIt rises, so air flows in
3. CIt does not change
4. DIt falls, so air flows out

Pepsin digests protein in the stomach at about pH 2, but it stops working once food moves into the small intestine, where the pH is higher. Why?

1. APepsin only works on fats in the small intestine
2. BPepsin is used up completely in the stomach, just like a reactant
3. CThe small intestine is too cold for any enzyme
4. DThe change in pH alters the shape of pepsin's active site

CO₂ in blood forms carbonic acid: CO₂ + H₂O ⇌ H₂CO₃ ⇌ H⁺ + HCO₃⁻. An anxious patient hyperventilates and breathes off extra CO₂. What happens to blood pH?

1. AIt falls, because oxygen is an acid
2. BIt rises, because less CO₂ means fewer H⁺ ions
3. CIt falls, because less CO₂ means more H⁺ ions
4. DIt stays exactly 7,40, because CO₂ does not affect pH