Chemistry for nursing entrance exams worksheet with answers

Standard atmospheric pressure (1 atm) is equal to how many millimetres of mercury?

1. A760 mmHg
2. B100 mmHg
3. C120 mmHg
4. D1000 mmHg

Which type of bond forms when electrons are shared between atoms?

1. AA metallic bond
2. BA covalent bond
3. CAn ionic bond
4. DA nuclear bond

Which of these is a physical change?

1. AWater boiling into steam
2. BBread being toasted until brown
3. CIron rusting
4. DMilk turning sour

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

1. AC₂H₄O₂
2. BCHO
3. CC₆H₁₂O₆
4. DCH₂O

Radioactive iodine (iodine-131) is used to treat some thyroid conditions. Why does it reach the thyroid?

1. AIodine-131 is not radioactive inside the body
2. BThe thyroid gland takes up iodine to make its hormones
3. CIodine is strongly attracted to the metal ions stored in the neck
4. DRadiation is always drawn toward the head

A red blood cell is placed in a concentrated (hypertonic) salt solution. What happens?

1. AWater enters the cell, which swells and may burst
2. BSalt leaves the cell, which swells
3. CThe cell stays the same size and shape
4. DWater leaves the cell, which shrinks

CO₂ in blood forms carbonic acid: CO₂ + H₂O ⇌ H₂CO₃ ⇌ H⁺ + HCO₃⁻. An anxious patient hyperventilates and breathes off extra CO₂. What happens to blood pH?

1. AIt falls, because oxygen is an acid
2. BIt stays exactly 7.40, because CO₂ does not affect pH
3. CIt falls, because less CO₂ means more H⁺ ions
4. DIt rises, because less CO₂ means fewer H⁺ ions

A sealed rigid can holds gas at 2 atm and 27 °C. It is heated to 327 °C. What is the new pressure?

1. A2.4 atm
2. B1 atm
3. C4 atm
4. D24 atm