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

Which state of matter has a fixed volume but takes the shape of its container?

1. ALiquid
2. BSolid
3. CGas
4. DPlasma

Нейтральный атом имеет 11 протонов. Сколько у него электронов?

1. A12
2. B22
3. C11
4. D10

What is osmosis?

1. AThe breaking of a solid into ions
2. BThe movement of water across a semipermeable membrane
3. CThe movement of solute particles against a gradient using energy
4. DThe dissolving of a gas in a liquid

What is the oxidation number of oxygen in most of its compounds?

1. A+2
2. B0
3. C−1
4. D−2

Which of these is a colloid?

1. AMilk
2. BSalt water
3. CSand in water
4. DPure water

A reaction is at equilibrium. More of one reactant is added. According to Le Chatelier's principle, what happens?

1. AThe reaction stops completely
2. BThe equilibrium shifts toward the reactants
3. CThe equilibrium shifts toward the products
4. DNothing changes

Hyperbaric oxygen therapy places a patient in a chamber with oxygen at higher than normal pressure. Why does this raise the oxygen dissolved in blood plasma?

1. AGas solubility in a liquid increases with the partial pressure of the gas
2. BHigher pressure makes red blood cells divide faster
3. CHigher pressure lowers body temperature, so the blood can hold much more gas
4. DHigher pressure turns the oxygen into a liquid

Чем различаются два изотопа одного элемента?

1. AЧислом электронов в нейтральном атоме
2. BМассовым числом
3. CХимическими реакциями, в которых они участвуют
4. DАтомным номером