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

How is percent yield calculated?

1. A(Theoretical yield ÷ actual yield) × 100
2. BActual yield − theoretical yield
3. C(Mass of reactants ÷ mass of products) × 100
4. D(Actual yield ÷ theoretical yield) × 100

A blown-up balloon is put in a freezer. What happens to its volume?

1. AThe balloon bursts
2. BIt increases
3. CIt stays exactly the same
4. DIt decreases

Which property is typical of bases?

1. AThey feel slippery
2. BThey have a pH below 7
3. CThey turn blue litmus red
4. DThey taste sour

Каков заряд хлорид-иона?

1. A−2
2. B+7
3. C+1
4. D−1

Какова молярная масса воды (H = 1 г/моль, O = 16 г/моль)?

1. A32 г/моль
2. B10 г/моль
3. C18 г/моль
4. D17 г/моль

Using significant figures, what is 2,5 cm × 3,42 cm?

1. A8,550 cm²
2. B8,55 cm²
3. C9 cm²
4. D8,6 cm²

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

A sealed rigid can holds gas at 2 atm and 27 °C. It is heated to 327 °C. What is the new pressure?

1. A4 atm
2. B2,4 atm
3. C1 atm
4. D24 atm