Chemistry for nursing entrance exams worksheet with answers

In a solution, what is the solvent?

1. AAny solid that will not dissolve, however long it is stirred
2. BThe gas given off when a solid dissolves
3. CThe substance that is dissolved, usually present in the smaller amount
4. DThe substance that does the dissolving, usually present in the larger amount

What is the melting point of a substance?

1. AThe temperature at which its liquid turns into a gas
2. BThe temperature at which it dissolves in water
3. CThe temperature at which its solid turns into a liquid
4. DThe temperature at which it catches fire

A solution has a pH of 3. How is it described?

1. ABasic
2. BSaturated
3. CAcidic
4. DNeutral

A solution has a pH of 2. What is its hydrogen ion concentration?

1. A1 × 10⁻¹² mol/L
2. B2 mol/L
3. C1 × 10⁻² mol/L
4. D1 × 10² mol/L

How does dissolving salt in water affect the water's boiling point?

1. AIt raises the boiling point slightly
2. BIt makes the water boil at room temperature
3. CIt lowers the boiling point slightly
4. DIt has no effect on the boiling point

Which statement describes a strong acid?

1. AIt only partly releases hydrogen ions
2. BIt is always highly concentrated
3. CIt ionises completely in water
4. DIt has a pH above 7

Half-normal saline (0.45% NaCl) is compared with blood plasma, which has about the same concentration as 0.9% NaCl. How is 0.45% NaCl described, and what happens to red blood cells placed in it?

1. AHypertonic; water tends to move out of the cells, which shrink
2. BHypotonic; water tends to move into the cells, which swell
3. CHypertonic; salt moves into the cells, which then swell
4. DIsotonic; water moves equally in and out, so the cells keep their shape

A solution has a hydrogen ion concentration of 1 × 10⁻⁹ mol/L. What is its pH, and is it acidic or basic?

1. ApH 9, acidic
2. BpH −9, acidic
3. CpH 5, acidic
4. DpH 9, basic