Робочий аркуш «Хімія для вступних іспитів на медсестринство» з відповідями

Which process is exothermic (releases heat)?

1. ABurning methane gas
2. BPhotosynthesis
3. CMelting a block of ice
4. DEvaporating water

According to the Arrhenius definition, what does a base produce in water?

1. AChloride ions (Cl⁻)
2. BCarbonate ions (CO₃²⁻)
3. CHydrogen ions (H⁺)
4. DHydroxide ions (OH⁻)

Where do the mole ratios used in stoichiometry come from?

1. AThe coefficients of the balanced equation
2. BThe subscripts in each formula
3. CThe molar masses of the reactants
4. DThe physical states of the substances

Атом хлору-37 має 17 протонів. Скільки в нього нейтронів?

1. A54
2. B20
3. C17
4. D37

Drops of water form on the outside of a glass of ice water. Where does this water come from?

1. AThe ice evaporates through the glass
2. BWater vapour in the air condenses on the cold glass
3. CWater leaks through tiny holes in the glass
4. DThe glass releases water when it gets cold

Що таке водневі зв'язки?

1. AЙонні зв'язки між йонами водню та металами
2. BПритягання між воднем однієї молекули й атомом O, N або F іншої
3. CКовалентні зв'язки між двома атомами водню в H₂
4. DЗв'язки всередині ядра водню

A small amount of acid is spilled on a lab bench. Why is a weak base such as sodium bicarbonate preferred over strong NaOH to neutralise it?

1. ANaOH does not react with acids at room temperature
2. BSodium bicarbonate makes the spilled acid evaporate
3. CExcess sodium bicarbonate is far less harmful than excess NaOH
4. DSodium bicarbonate is a strong acid that cancels the spill

J.J. Thomson's cathode ray experiments led to which discovery?

1. AElectrons occupy fixed energy levels
2. BAtoms have a dense, positively charged nucleus
3. CAtoms contain small, negatively charged particles
4. DThe nucleus contains uncharged neutrons