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

Which process is exothermic (releases heat)?

1. ABurning methane gas
2. BMelting a block of ice
3. CPhotosynthesis
4. DEvaporating water

Which state of matter has neither a fixed shape nor a fixed volume?

1. ACrystal
2. BGas
3. CLiquid
4. DSolid

Как расположены элементы в современной периодической таблице?

1. AПо алфавиту их символов
2. BПо возрастанию атомного номера
3. CПо дате открытия
4. DПо возрастанию числа нейтронов

For the gas reaction N₂ + 3H₂ ⇌ 2NH₃, what is the effect of increasing the pressure?

1. AThe equilibrium shifts to the right, toward NH₃
2. BThe equilibrium shifts to the left, toward N₂ and H₂
3. CThere is no effect on the equilibrium
4. DThe NH₃ breaks down completely

Каковы продукты полного сгорания углеводорода, например метана?

1. AУглерод и газообразный водород
2. BКислород и вода
3. CУгарный газ и водород
4. DУглекислый газ и вода

How many covalent bonds does a carbon atom usually form?

1. A4
2. B3
3. C2
4. D1

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

Hydrogen is usually placed at the top of group 1. Which statement about hydrogen is correct?

1. AIt always forms H⁺ ions and never shares electrons
2. BIt is an alkali metal that is solid at room temperature
3. CIt has one valence electron like group 1 metals, but it is a nonmetal gas
4. DIt has a full outer shell like the noble gases