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

What is the formula of sulfuric acid?

1. AHCl
2. BH₂SO₃
3. CHNO₃
4. DH₂SO₄

Какой тип реакции показан в реакции A + B → AB?

1. AГорение
2. BРазложение
3. CЗамещение
4. DСоединение (синтез)

Какой тип реакции показан в реакции AB → A + B?

1. AОбмен
2. BРазложение
3. CНейтрализация
4. DСоединение

At 20 °C, about 36 g of NaCl dissolves in 100 g of water. If 50 g of NaCl is stirred into 100 g of water at 20 °C, what happens?

1. AAbout 14 g dissolves and about 36 g stays undissolved
2. BAll 50 g dissolves
3. CAbout 36 g dissolves and about 14 g stays undissolved
4. DNone of the salt dissolves

How many oxygen atoms are in one formula unit of calcium nitrate, Ca(NO₃)₂?

1. A2
2. B3
3. C5
4. D6

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

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

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 left gaps and correctly predicted the properties of elements not yet discovered
3. CHe discovered the noble gases and placed them in group 18
4. DHe proved that the atoms of every element contain electrons

A scuba diver breathes compressed air deep underwater. Why must the diver breathe out while swimming up to the surface?

1. AOxygen turns to liquid at the surface
2. BThe water gets warmer near the surface
3. CThe air in the lungs expands as the outside pressure falls
4. DThe air in the lungs shrinks as the outside pressure falls