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

Which three elements make up carbohydrates?

1. ACarbon, nitrogen and sulfur
2. BHydrogen, nitrogen and phosphorus
3. CCarbon, hydrogen and oxygen
4. DCarbon, hydrogen and nitrogen

Where are the metalloids found on the periodic table?

1. AIn group 18, at the far right edge of the table
2. BIn the two separate rows at the bottom of the table
3. CIn group 1, at the far left edge of the table
4. DAlong the staircase line between the metals and the nonmetals

What is an empirical formula?

1. AThe mass of one mole of a compound
2. BThe simplest whole-number ratio of atoms in a compound
3. CThe actual number of each atom in one molecule
4. DA drawing of how the atoms are bonded

What is the oxidation number of sulfur in H₂SO₄?

1. A−2
2. B+2
3. C+4
4. D+6

Why must temperatures be in kelvin in gas law calculations?

1. AKelvin values are always below 100
2. BCelsius can only be used for liquids
3. CThe kelvin scale has smaller degrees, which gives more precise answers
4. DGas volume and pressure are proportional to the absolute temperature

In the reaction Zn + Cu²⁺ → Zn²⁺ + Cu, which species loses electrons?

1. ACu²⁺
2. BZn²⁺
3. CZn
4. DCu

Why does atomic radius decrease from left to right across a period?

1. AMore protons pull the electrons of the same outer shell closer
2. BThe atoms lose electrons across the period
3. CNeutrons push the electrons outward less strongly
4. DEach element adds a new electron shell

Steel can be protected from rusting by coating it with zinc (galvanising). Why does the steel stay protected even if the zinc coating is scratched?

1. AZinc turns the iron into a noble metal
2. BZinc is less reactive than iron, so it pushes oxygen and water away from the iron
3. CZinc is more reactive than iron, so it corrodes instead of the iron
4. DZinc absorbs all the water from the air