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

Which property is typical of nonmetals?

1. AThey easily lose electrons to form positive ions
2. BThey are shiny and easily bent into wires
3. CThey are all solids at room temperature
4. DThey are poor conductors of heat and electricity

What is an electrolyte?

1. AA substance that forms ions and conducts electricity when dissolved in water
2. BA gas that dissolves in blood
3. CA substance that dissolves as whole molecules without forming any ions
4. DA metal that conducts electricity as a solid

Boyle's law describes the relationship between which two properties of a gas, at constant temperature?

1. APressure and temperature
2. BVolume and temperature
3. CMass and volume
4. DPressure and volume

In the ideal gas law, PV = nRT, what does n stand for?

1. AThe density of the gas
2. BThe number of moles of gas
3. CThe number of atoms per molecule
4. DThe number of molecules of gas

Nitric acid (HNO₃) reacts with potassium hydroxide (KOH). Which salt forms?

1. APotassium hydride, KH
2. BNitrogen hydroxide, NOH
3. CPotassium nitrate, KNO₃
4. DPotassium nitrite, KNO₂

Glucose has the molecular formula C₆H₁₂O₆. What is its empirical formula?

1. AC₆H₁₂O₆
2. BCHO
3. CC₂H₄O₂
4. DCH₂O

Sulfuric acid reacts with sodium hydroxide: H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O. How many moles of NaOH neutralise 0,5 mol of H₂SO₄?

1. A0,25 mol
2. B1 mol
3. C2 mol
4. D0,5 mol

How many atoms in total are in 0,5 mol of water, H₂O?

1. A1,81 × 10²⁴
2. B6,02 × 10²³
3. C3,01 × 10²³
4. D9,03 × 10²³