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

What is an element?

1. AA substance of two or more elements chemically bonded together
2. BA particle with an electric charge
3. CA physical mixture of different substances
4. DA substance made of only one kind of atom

Нейтральный атом имеет 11 протонов. Сколько у него электронов?

1. A12
2. B10
3. C22
4. D11

What is radioactivity?

1. AThe release of radiation by unstable atomic nuclei
2. BThe glow produced by any hot object
3. CThe flow of electrons through a metal wire
4. DThe release of heat and light when fuels burn in air

Which assumption is made about an ideal gas?

1. AIts particles stay still at room temperature
2. BIts particles are large, closely packed and strongly attracted
3. CIts particles lose energy in every collision
4. DIts particles have no attraction to each other

Which is larger, a sodium atom (Na) or a sodium ion (Na⁺)?

1. AThey are the same size
2. BIt depends on the temperature
3. CThe sodium atom
4. DThe sodium ion

Water has a high specific heat capacity. How does this help the human body?

1. AIt makes water a poor solvent for salts
2. BIt makes the blood more acidic
3. CIt helps keep body temperature stable
4. DIt allows oxygen to dissolve in water more easily

In the reaction NaCl(aq) + AgNO₃(aq) → AgCl(s) + NaNO₃(aq), which ions are spectator ions?

1. ANa⁺ and Cl⁻
2. BAg⁺ and NO₃⁻
3. CNa⁺ and NO₃⁻
4. DAg⁺ and Cl⁻

Why is Dmitri Mendeleev's early periodic table regarded as such a success?

1. AHe arranged the elements by atomic number, which he had discovered
2. BHe proved that the atoms of every element contain electrons
3. CHe left gaps and correctly predicted the properties of elements not yet discovered
4. DHe discovered the noble gases and placed them in group 18