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

What is a solution?

1. AA pure compound made of two elements
2. BA mixture that is the same throughout (homogeneous)
3. CA solid that has been melted
4. DA mixture in which particles settle out on standing

What should a student always wear to protect the eyes when working with chemicals?

1. AContact lenses
2. BSunglasses
3. CSafety goggles
4. DReading glasses

Which of these is a polyatomic ion?

1. AChloride, Cl⁻
2. BOxide, O²⁻
3. CSodium, Na⁺
4. DSulfate, SO₄²⁻

A bag of 5% (w/v) glucose solution (called 5% dextrose in the US) contains 5 g of glucose per 100 mL. How many grams of glucose are in 1 L?

1. A50 g
2. B0,5 g
3. C5 g
4. D500 g

В реакции 2H₂ + O₂ → 2H₂O сколько молей воды образуется из 3 молей кислорода?

1. A1,5 моль
2. B2 моль
3. C3 моль
4. D6 моль

A solution has a pH of 10. What is its pOH at 25 °C?

1. A4
2. B14
3. C10
4. D24

The true volume in a flask is 10,0 mL. A student measures it three times and gets 8,1 mL, 8,1 mL and 8,2 mL. How are these results best described?

1. APrecise but not accurate
2. BBoth accurate and precise
3. CAccurate but not precise
4. DNeither accurate nor precise

5,85 g of NaCl (molar mass 58,5 g/mol) is dissolved to make 500 mL of solution. What is the molarity?

1. A2 M
2. B0,2 M
3. C0,1 M
4. D0,05 M