Робочий аркуш «Хімія для вступних іспитів на медсестринство» з відповідями

What is a precipitate?

1. AA substance that speeds up a reaction
2. BAn insoluble solid that forms when two solutions react
3. CA liquid that forms when a solid melts
4. DA gas that bubbles out when two solutions are mixed

Яке pH чистої води за 25 °C?

1. A14
2. B0
3. C1
4. D7

Which method separates two liquids with different boiling points, such as alcohol and water?

1. AUsing a magnet
2. BSieving
3. CFiltration
4. DDistillation

How does atomic radius change going down a group?

1. AIt stays the same
2. BIt decreases
3. CIt increases
4. DIt decreases, then increases

Яка речовина окиснюється в реакції 2Mg + O₂ → 2MgO?

1. AМагній, бо він приєднує електрони
2. BЖодна з речовин не змінює свій заряд
3. CМагній, бо він віддає електрони
4. DКисень, бо він віддає електрони

A red blood cell is placed in a concentrated (hypertonic) salt solution. What happens?

1. AWater leaves the cell, which shrinks
2. BThe cell stays the same size and shape
3. CWater enters the cell, which swells and may burst
4. DSalt leaves the cell, which swells

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

Under which conditions does a real gas behave least like an ideal gas?

1. AHigh pressure and low temperature
2. BLow pressure and low volume of particles
3. CHigh temperature and large container
4. DLow pressure and high temperature