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

Как называется переход из жидкого состояния в газообразное?

1. AЗамерзание
2. BПлавление
3. CКонденсация
4. DИспарение

How is percent yield calculated?

1. A(Mass of reactants ÷ mass of products) × 100
2. B(Theoretical yield ÷ actual yield) × 100
3. C(Actual yield ÷ theoretical yield) × 100
4. DActual yield − theoretical yield

Which method separates sand from water?

1. AFiltration
2. BDistillation
3. CChromatography
4. DEvaporation of the sand

Which substance is a non-electrolyte when dissolved in water?

1. AHydrochloric acid
2. BGlucose
3. CPotassium chloride
4. DSodium chloride

What is the oxidation number of an element in its uncombined (elemental) form, such as Fe or O₂?

1. A−1
2. BIt equals the group number
3. C0
4. D+1

When a nucleus emits an alpha particle, how do its mass number and atomic number change?

1. AMass number stays the same and atomic number rises by 1
2. BMass number falls by 4 and atomic number falls by 2
3. CMass number falls by 2 and atomic number falls by 4
4. DNeither changes

Какой ряд располагает элементы в порядке возрастания атомного радиуса?

1. AO, F, N, C
2. BNa, Mg, Al, Si
3. CF, O, N, C
4. DC, N, O, F

A carboxylic acid reacts with an alcohol in the presence of an acid catalyst. What are the products?

1. AAn amino acid and carbon dioxide
2. BA salt and hydrogen
3. CAn alkane and oxygen
4. DAn ester and water