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

What is the formula of methane, the main gas in natural gas?

1. ACO₂
2. BC₂H₆
3. CCH₂
4. DCH₄

In a solution, what is the solvent?

1. AAny solid that will not dissolve, however long it is stirred
2. BThe substance that does the dissolving, usually present in the larger amount
3. CThe gas given off when a solid dissolves
4. DThe substance that is dissolved, usually present in the smaller amount

What is a single covalent bond?

1. ATwo pairs of electrons shared between two atoms
2. BThe attraction between two oppositely charged ions
3. COne electron transferred from one atom to another
4. DOne pair of electrons shared between two atoms

Как в целом изменяется атомный радиус при движении слева направо по периоду?

1. AУвеличивается
2. BУменьшается
3. CСначала удваивается, затем уменьшается вдвое
4. DОстаётся в точности прежним

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

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

Что измеряет температура согласно молекулярно-кинетической теории?

1. AСреднюю кинетическую энергию частиц
2. BМассу каждой частицы
3. CРазмер сосуда
4. DОбщее число частиц

Образец содержит 3,01 × 10²³ молекул воды. Сколько это молей?

1. A1,81 моль
2. B0,5 моль
3. C2 моль
4. D3,01 моль

Orange bromine water is shaken with two hydrocarbons. With hexene it turns colourless; with hexane it stays orange. What does this show?

1. AHexene contains a C=C double bond; hexane does not
2. BHexene is an alcohol and hexane is an acid
3. CBoth contain double bonds, but hexane reacts more slowly
4. DHexane contains a C=C double bond; hexene does not