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

What are the units of molarity?

1. AMoles of solute per litre of solution (mol/L)
2. BGrams of solute per 100 g of solution
3. CGrams of solute per litre of solution (g/L)
4. DMoles of solute per kilogram of the solvent used

What is a precipitate?

1. AA substance that speeds up a reaction
2. BA liquid that forms when a solid melts
3. CAn insoluble solid that forms when two solutions react
4. DA gas that bubbles out when two solutions are mixed

Which of these is a polyatomic ion?

1. AChloride, Cl⁻
2. BSodium, Na⁺
3. COxide, O²⁻
4. DSulfate, SO₄²⁻

Water has a high specific heat capacity. How does this help the human body?

1. AIt helps keep body temperature stable
2. BIt makes the blood more acidic
3. CIt makes water a poor solvent for salts
4. DIt allows oxygen to dissolve in water more easily

During digestion, large molecules are broken down by adding water across their bonds. What is this reaction called?

1. AHydrolysis
2. BPolymerisation
3. CCombustion
4. DCondensation

A solution has a pH of 2. What is its hydrogen ion concentration?

1. A1 × 10⁻¹² mol/L
2. B1 × 10⁻² mol/L
3. C1 × 10² mol/L
4. D2 mol/L

Hyperbaric oxygen therapy places a patient in a chamber with oxygen at higher than normal pressure. Why does this raise the oxygen dissolved in blood plasma?

1. AGas solubility in a liquid increases with the partial pressure of the gas
2. BHigher pressure turns the oxygen into a liquid
3. CHigher pressure makes red blood cells divide faster
4. DHigher pressure lowers body temperature, so the blood can hold much more gas

What is the net ionic equation for the neutralisation of any strong acid by any strong base?

1. AH⁺ + Cl⁻ → HCl
2. BH⁺ + OH⁻ → H₂O
3. CNa⁺ + Cl⁻ → NaCl
4. DH₂ + O₂ → H₂O₂