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

Which positive ion is found in the highest concentration inside most body cells?

1. APotassium (K⁺)
2. BMagnesium (Mg²⁺)
3. CCalcium (Ca²⁺)
4. DSodium (Na⁺)

Почему воду часто называют универсальным растворителем?

1. AЭто единственная жидкость на Земле
2. BОна полностью растворяет любое вещество
3. CОна растворяет больше веществ, чем другие распространённые жидкости
4. DВ её молекуле нигде нет частичных зарядов, поэтому она смешивается со всем

What is the normal pH range of human arterial blood?

1. A6,35 to 6,45
2. B7,35 to 7,45
3. C7,00 to 7,10
4. D7,85 to 7,95

Why do group 1 metals such as sodium react so easily?

1. AThey have a full outer shell of electrons
2. BThey easily gain one extra electron
3. CTheir nuclei contain no neutrons
4. DThey have one outer electron that is easily lost

A radioactive isotope has a half-life of 5 days. A sample starts with 80 g. How much is left after 10 days?

1. A0 g
2. B20 g
3. C40 g
4. D10 g

Which of these is a colloid?

1. APure water
2. BSalt water
3. CMilk
4. DSand in water

An element in period 3 forms an oxide with the formula X₂O₃. Which element is X?

1. AMagnesium
2. BAluminium
3. CSodium
4. DPhosphorus

A solution of acetic acid conducts electricity only weakly, while hydrochloric acid of the same concentration conducts strongly. Why?

1. AAcetic acid does not dissolve in water at all
2. BAcetic acid only partly ionises, so it forms fewer ions
3. CHydrochloric acid contains metal atoms
4. DAcetic acid forms more ions than hydrochloric acid does