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

К какому виду материи относится солёная вода?

1. AК неоднородной смеси
2. BК однородной смеси (раствору)
3. CК соединению
4. DК чистому элементу

Какое вещество является основанием?

1. AУксус (уксусная кислота)
2. BЛимонный сок (лимонная кислота)
3. CГидроксид натрия (NaOH)
4. DСоляная кислота (HCl)

Which quantity is the same for 1 mole of any substance?

1. AThe mass in grams
2. BThe volume as a liquid
3. CThe number of atoms per molecule
4. DThe number of particles

Drops of water form on the outside of a glass of ice water. Where does this water come from?

1. AThe glass releases water when it gets cold
2. BThe ice evaporates through the glass
3. CWater leaks through tiny holes in the glass
4. DWater vapour in the air condenses on the cold glass

In 2KClO₃ → 2KCl + 3O₂, how many moles of O₂ form from 4 mol of KClO₃?

1. A8 mol
2. B6 mol
3. C3 mol
4. D4 mol

A piece of metal has a density of 8 g/cm³ and a volume of 5 cm³. What is its mass?

1. A40 g
2. B13 g
3. C0,625 g
4. D1,6 g

Cotton soaked in ammonia (NH₃) and cotton soaked in hydrogen chloride (HCl) are placed at opposite ends of a glass tube. A white ring of ammonium chloride forms closer to the HCl end. What does this show?

1. AThe white ring forms where the gases are heaviest
2. BThe HCl molecules diffuse faster than NH₃ molecules
3. CBoth gases diffuse at the same speed
4. DThe lighter NH₃ molecules diffuse faster than HCl molecules

In Rutherford's gold foil experiment, most alpha particles passed straight through the foil but a few bounced back. What did this show?

1. AElectrons are spread evenly through a positive "pudding"
2. BAtoms are solid, indivisible spheres
3. CAn atom is mostly empty space with a small, dense, positive nucleus
4. DElectrons move in fixed circular orbits