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

What does the double arrow (⇌) in a chemical equation show?

1. AThe reaction is reversible
2. BThe reaction needs a catalyst
3. CThe reaction releases heat
4. DThe reaction is very fast

What is an empirical formula?

1. AThe mass of one mole of a compound
2. BThe simplest whole-number ratio of atoms in a compound
3. CA drawing of how the atoms are bonded
4. DThe actual number of each atom in one molecule

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

1. AГорение
2. BРазложение
3. CСоединение (синтез)
4. DЗамещение

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 attractions between the molecules become stronger
3. CThe liquid's volume decreases and squeezes out vapour
4. DThe molecules become heavier and press harder on the surface

Атом магния теряет два электрона. Какой ион образуется?

1. AMg²⁺
2. BMg⁻
3. CMg⁺
4. DMg²⁻

What does Avogadro's law state?

1. AEqual masses of all gases contain equal numbers of molecules under any conditions
2. BThe pressure of a gas doubles when its temperature is halved
3. CEqual volumes of gases at the same temperature and pressure contain equal numbers of molecules
4. DOne mole of any gas has a mass of 22,4 g

Why does food cook faster in a pressure cooker?

1. ASteam is trapped, so the water boils at a lower temperature
2. BPressure itself breaks down the food, regardless of temperature
3. CThe higher pressure lowers the boiling point
4. DThe higher pressure raises the boiling point, so the water is hotter

An element has the electron arrangement 2, 8, 8, 2. Where is it on the periodic table?

1. AGroup 2, period 4
2. BGroup 8, period 2
3. CGroup 4, period 2
4. DGroup 2, period 2