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

What colour does blue litmus paper turn in an acid?

1. ABlue (no change)
2. BGreen
3. CPurple
4. DRed

What is osmosis?

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

Boyle's law describes the relationship between which two properties of a gas, at constant temperature?

1. APressure and volume
2. BMass and volume
3. CPressure and temperature
4. DVolume and temperature

Oxygen has 8 electrons. What is its electron configuration?

1. A1s² 2s⁶
2. B1s² 2p⁶
3. C1s² 2s² 2p⁶
4. D1s² 2s² 2p⁴

An exothermic reaction is at equilibrium. What happens if the temperature is raised?

1. AThe equilibrium shifts toward the products, raising the yield
2. BThe reaction becomes endothermic
3. CThe equilibrium does not change
4. DThe equilibrium shifts toward the reactants

Why does the vapour pressure of a liquid increase as it is heated?

1. AThe molecules become heavier and press harder on the surface
2. BThe attractions between the molecules become stronger
3. CThe liquid's volume decreases and squeezes out vapour
4. DMore molecules have enough energy to escape into the gas phase

Which pair of substances could form a buffer solution?

1. AHydrochloric acid (HCl) and sodium hydroxide (NaOH)
2. BCarbonic acid (H₂CO₃) and bicarbonate (HCO₃⁻)
3. CSodium chloride (NaCl) and water
4. DHydrochloric acid (HCl) and chloride (Cl⁻)

What is the oxidation number of manganese in potassium permanganate, KMnO₄?

1. A+7
2. B−1
3. C+1
4. D+4