Химия для вступительных экзаменов на сестринские программы: лист заданий с ответами

Какова химическая формула воды?

1. AH₂O₂
2. BH₂O
3. COH
4. DHO₂

What is an electrolyte?

1. AA substance that forms ions and conducts electricity when dissolved in water
2. BA gas that dissolves in blood
3. CA substance that dissolves as whole molecules without forming any ions
4. DA metal that conducts electricity as a solid

What is a beta particle?

1. AA wave of visible light
2. BA neutron that leaves the nucleus
3. CA helium nucleus with two protons and two neutrons
4. DA high-energy electron released from a nucleus

A red blood cell is placed in pure water (a hypotonic solution). What happens?

1. AWater leaves the cell, which shrinks and wrinkles
2. BSalt enters the cell, which shrinks
3. CWater enters the cell, which swells and may burst
4. DNothing happens to the cell

Rubbing alcohol evaporates faster than water at room temperature. What does this suggest?

1. AIts molecules are heavier than water molecules
2. BIts intermolecular forces are stronger than water's
3. CIt has a higher boiling point than water
4. DIts intermolecular forces are weaker than water's

How does evaporation differ from boiling?

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

Сколько граммов NaOH (молярная масса 40 г/моль) нужно для приготовления 500 мл 0,2 М раствора?

1. A4 г
2. B40 г
3. C0,1 г
4. D8 г

В реакции CuO + H₂ → Cu + H₂O какое вещество восстанавливается?

1. AВода, потому что она образуется
2. BВодород, потому что он присоединяет кислород
3. CМедь, потому что она теряет электроны
4. DОксид меди, потому что медь принимает электроны