护理入学考试化学练习卷（附答案）

What are enzymes?

1. ASugars that store energy in the liver
2. BFats that form most of the cell membrane
3. CBiological catalysts, usually proteins
4. DMinerals that build bone

Which element is a metalloid?

1. AArgon
2. BSulfur
3. CSilicon
4. DSodium

At sea level, at what temperature does pure water freeze?

1. A100 °C (212 °F)
2. B0 °C (32 °F)
3. C−32 °C (−26 °F)
4. D32 °C (90 °F)

How does atomic radius change going down a group?

1. AIt decreases
2. BIt decreases, then increases
3. CIt increases
4. DIt stays the same

Which element has the most metallic character?

1. AAluminium (Al)
2. BSodium (Na)
3. CChlorine (Cl)
4. DCaesium (Cs)

What are London dispersion forces?

1. AWeak, temporary attractions caused by shifting electrons in molecules
2. BStrong bonds formed by transferring electrons
3. CForces that hold protons together in the nucleus
4. DAttractions between a hydrogen atom and a metal ion

Sulfuric acid reacts with sodium hydroxide: H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O. How many moles of NaOH neutralise 0.5 mol of H₂SO₄?

1. A2 mol
2. B0.25 mol
3. C1 mol
4. D0.5 mol

At room temperature chlorine (Cl₂) is a gas, bromine (Br₂) is a liquid and iodine (I₂) is a solid. What best explains this trend?

1. AChlorine is ionic, while iodine is metallic
2. BLarger molecules with more electrons have stronger dispersion forces
3. CThe covalent bond in I₂ is much stronger than in Cl₂
4. DIodine forms hydrogen bonds but chlorine does not