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

In a chemical reaction, what is the limiting reactant?

1. AThe catalyst that controls the speed
2. BThe reactant that is left over at the end
3. CThe reactant that runs out first and stops the reaction
4. DThe reactant with the largest mass

Which acid is found in the stomach?

1. ASulfuric acid
2. BNitric acid
3. CAcetic acid
4. DHydrochloric acid

Which method separates two liquids with different boiling points, such as alcohol and water?

1. AFiltration
2. BDistillation
3. CUsing a magnet
4. DSieving

How does evaporation differ from boiling?

1. AEvaporation produces a solid, while boiling produces a gas
2. BEvaporation happens throughout the liquid at a set temperature; boiling happens only at the surface
3. CEvaporation needs a higher temperature than boiling
4. DEvaporation happens only at the surface and at any temperature; boiling happens throughout the liquid at a set temperature

Why does ice float on liquid water?

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

What is 380 mmHg in atmospheres?

1. A0,38 atm
2. B2 atm
3. C380 atm
4. D0,5 atm

Which pair of substances could form a buffer solution?

1. AHydrochloric acid (HCl) and chloride (Cl⁻)
2. BCarbonic acid (H₂CO₃) and bicarbonate (HCO₃⁻)
3. CSodium chloride (NaCl) and water
4. DHydrochloric acid (HCl) and sodium hydroxide (NaOH)

Sulfuric acid reacts with sodium hydroxide: H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O. How many moles of NaOH neutralise 0,5 mol of H₂SO₄?

1. A1 mol
2. B0,5 mol
3. C2 mol
4. D0,25 mol