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

Trong dung dịch muối, muối được gọi là gì?

1. AChất xúc tác
2. BKết tủa
3. CChất tan
4. DDung môi

According to collision theory, what must happen for particles to react?

1. AThey must both be in the solid state at the same time
2. BThey must stay completely still next to each other
3. CThey must collide with enough energy and the right orientation
4. DThey must have the same mass

DNA belongs to which group of biological molecules?

1. ACarbohydrates
2. BProteins
3. CLipids
4. DNucleic acids

Water climbs up a narrow glass tube. Which property mainly causes this?

1. ALow density of water
2. BWater's high boiling point
3. CAdhesion of water to the glass
4. DEvaporation of water from the tube

What is the molar mass of calcium carbonate, CaCO₃ (Ca = 40, C = 12, O = 16 g/mol)?

1. A116 g/mol
2. B84 g/mol
3. C100 g/mol
4. D68 g/mol

Which coefficients balance __Na + __Cl₂ → __NaCl?

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

Why are the radioactive tracers used for medical imaging usually chosen to have short half-lives?

1. AThey stay active for many years, so a single dose can be used for every future scan
2. BThey emit only alpha particles, which are harmless inside the body
3. CThey give a strong signal for imaging but leave the body's tissues exposed only briefly
4. DShort half-life isotopes are not radioactive

Carbon-12 and carbon-14 react in exactly the same way in chemical reactions. Why?

1. AThey have the same mass number
2. BCarbon-14 turns into carbon-12 before reacting
3. CThey have the same number of protons and electrons
4. DThey have the same number of neutrons