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

What is activation energy?

1. AThe minimum energy reacting particles need for a reaction to happen
2. BThe energy needed to melt a solid
3. CThe energy stored in the products
4. DThe total energy released once the reaction has finished

A food Calorie (written with a capital C) equals which amount of energy?

1. A1 joule
2. B1 calorie
3. C1 kilojoule (1000 J)
4. D1 kilocalorie

Plants absorb energy from sunlight during photosynthesis. How is photosynthesis classified?

1. AExothermic
2. BEndothermic
3. CNuclear
4. DNeutralisation

Что делает буферный раствор?

1. AПоддерживает постоянную температуру раствора
2. BУскоряет реакции нейтрализации, чтобы pH быстро достигал ровно 7
3. CПротивостоит изменениям pH при добавлении небольшого количества кислоты или основания
4. DПревращает любую кислоту в сильное основание

Which equation shows a combustion reaction?

1. ACaCO₃ → CaO + CO₂
2. BZn + CuSO₄ → ZnSO₄ + Cu
3. CC₂H₅OH + 3O₂ → 2CO₂ + 3H₂O
4. DNaOH + HCl → NaCl + H₂O

When two monomers join to form a larger molecule and a water molecule is released, what is the reaction called?

1. ACombustion
2. BHydrolysis (splitting with water)
3. CNeutralisation
4. DCondensation (dehydration synthesis)

In the fission reaction ²³⁵U + ¹n → ¹⁴¹Ba + ⁹²Kr + ? ¹n, how many neutrons are released?

1. A4
2. B1
3. C2
4. D3

Equal masses of sand and water sit in the sun and absorb the same amount of heat. Which warms up more, and why?

1. ASand, because it has a lower specific heat capacity than water
2. BSand, because it has a higher specific heat capacity than water
3. CWater, because it has a higher specific heat capacity than sand
4. DBoth warm equally, because they absorbed the same heat