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

Как называется переход из жидкого состояния в газообразное?

1. AКонденсация
2. BПлавление
3. CЗамерзание
4. DИспарение

Which three elements make up carbohydrates?

1. ACarbon, hydrogen and nitrogen
2. BCarbon, nitrogen and sulfur
3. CCarbon, hydrogen and oxygen
4. DHydrogen, nitrogen and phosphorus

Какова химическая формула воды?

1. AHO₂
2. BH₂O₂
3. CH₂O
4. DOH

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 36 g dissolves and about 14 g stays undissolved
2. BAbout 14 g dissolves and about 36 g stays undissolved
3. CNone of the salt dissolves
4. DAll 50 g dissolves

Which measurement has three significant figures?

1. A5,0006
2. B56
3. C0,00560
4. D0,0056

Какое свойство типично для ионных соединений, таких как NaCl?

1. AВысокие температуры плавления; в растворе проводят ток
2. BМягкость и лёгкая изгибаемость, как у металлов
3. CНизкие температуры плавления и газообразное состояние при комнатной температуре
4. DПроводимость электричества в виде сухих твёрдых веществ

A salt is dissolved in water in an insulated cup, and the water temperature falls from 25 °C to 20 °C. Which statement is correct?

1. ANo energy change occurred, because the temperature fell
2. BDissolving is exothermic; the dissolving salt released heat into the water
3. CDissolving is endothermic; the dissolving salt took heat from the water
4. DDissolving is endothermic; the water took heat from the salt

In terms of bonds, why is a reaction exothermic?

1. AMore energy is released forming new bonds than is absorbed breaking old ones
2. BMore energy is absorbed breaking old bonds than is released forming new ones
3. CForming bonds always absorbs energy
4. DNo bonds are broken in exothermic reactions