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

What is the formula of sulfuric acid?

1. AH₂SO₄
2. BH₂SO₃
3. CHNO₃
4. DHCl

Where are the metalloids found on the periodic table?

1. AIn group 1, at the far left edge of the table
2. BIn the two separate rows at the bottom of the table
3. CAlong the staircase line between the metals and the nonmetals
4. DIn group 18, at the far right edge of the table

Какие субатомные частицы находятся в ядре?

1. AПротоны и электроны
2. BТолько электроны
3. CЭлектроны и нейтроны
4. DПротоны и нейтроны

What does Avogadro's law state?

1. AThe pressure of a gas doubles when its temperature is halved
2. BEqual volumes of gases at the same temperature and pressure contain equal numbers of molecules
3. COne mole of any gas has a mass of 22,4 g
4. DEqual masses of all gases contain equal numbers of molecules under any conditions

Which measurement has three significant figures?

1. A5,0006
2. B56
3. C0,00560
4. D0,0056

What is the mass of 0,5 mol of NaCl (molar mass 58,5 g/mol)?

1. A29,25 g
2. B58,5 g
3. C0,5 g
4. D117 g

A student tests whether water temperature affects how fast sugar dissolves. Which set of factors should be kept the same in every trial?

1. AThe mass of sugar, the type of sugar, the volume of water and the amount of stirring
2. BNothing, because changing several factors at once gives more useful data
3. CThe water temperature and the dissolving time
4. DOnly the colour of the cup

In the reaction NH₃ + H₂O ⇌ NH₄⁺ + OH⁻, which substance acts as the Brønsted–Lowry acid?

1. AOH⁻
2. BH₂O
3. CNH₃
4. DNH₄⁺ only