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

What is the smallest particle of an element that still has the chemical properties of that element?

1. AAn atom
2. BA proton
3. CAn electron
4. DA nucleus

How is percent yield calculated?

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

Which of these is a polyatomic ion?

1. AOxide, O²⁻
2. BChloride, Cl⁻
3. CSodium, Na⁺
4. DSulfate, SO₄²⁻

Rubbing alcohol evaporates faster than water at room temperature. What does this suggest?

1. AIts intermolecular forces are stronger than water's
2. BIts intermolecular forces are weaker than water's
3. CIts molecules are heavier than water molecules
4. DIt has a higher boiling point than water

Какое свойство типично для ионных соединений, таких как NaCl?

1. AНизкие температуры плавления и газообразное состояние при комнатной температуре
2. BВысокие температуры плавления; в растворе проводят ток
3. CПроводимость электричества в виде сухих твёрдых веществ
4. DМягкость и лёгкая изгибаемость, как у металлов

Which element has the most metallic character?

1. AChlorine (Cl)
2. BAluminium (Al)
3. CCaesium (Cs)
4. DSodium (Na)

A nurse wipes a patient's arm with an alcohol swab and the patient says the skin feels cold. What explains this?

1. AThe alcohol absorbs heat from the skin as it evaporates
2. BThe alcohol is stored at a much lower temperature than the room
3. CThe alcohol reacts with the skin in an endothermic chemical reaction
4. DThe alcohol blocks the skin's nerve endings for warmth

Which element has the electron configuration 1s² 2s² 2p⁶ 3s² 3p⁵?

1. AFluorine
2. BSulfur
3. CChlorine
4. DArgon