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

What is the maximum number of electrons the first electron shell can hold?

1. A1
2. B8
3. C2
4. D18

What is gamma radiation?

1. AA fast stream of protons from the nucleus
2. BA slow-moving electron
3. CHigh-energy electromagnetic radiation with no mass or charge
4. DA stream of helium nuclei with a positive charge

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

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

What are London dispersion forces?

1. AAttractions between a hydrogen atom and a metal ion
2. BStrong bonds formed by transferring electrons
3. CForces that hold protons together in the nucleus
4. DWeak, temporary attractions caused by shifting electrons in molecules

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

1. A6 mol
2. B4 mol
3. C3 mol
4. D8 mol

Який елемент найелектронегативніший?

1. AНатрій
2. BФтор
3. CЗалізо
4. DГелій

A reaction at equilibrium has a very large equilibrium constant (K much greater than 1). What does this tell you?

1. AAt equilibrium, the mixture contains mostly products
2. BThe reaction cannot reach equilibrium
3. CThe reaction is very fast
4. DAt equilibrium, the mixture contains mostly reactants

A small amount of acid is spilled on a lab bench. Why is a weak base such as sodium bicarbonate preferred over strong NaOH to neutralise it?

1. ASodium bicarbonate makes the spilled acid evaporate
2. BExcess sodium bicarbonate is far less harmful than excess NaOH
3. CNaOH does not react with acids at room temperature
4. DSodium bicarbonate is a strong acid that cancels the spill