Chemistry for nursing entrance exams worksheet with answers

Why is water often called the universal solvent?

1. AIt is the only liquid found on Earth
2. BIt dissolves every substance completely
3. CIt dissolves more substances than other common liquids
4. DIt has no partial charges anywhere in its molecule, so it mixes with everything

What does the subscript 2 in H₂O tell you?

1. AEach molecule contains two oxygen atoms
2. BThere are two water molecules
3. CEach molecule contains two hydrogen atoms
4. DWater has a charge of 2

What is a hydrocarbon?

1. AAny compound that dissolves in water
2. BA compound made of hydrogen and oxygen
3. CA carbon atom with a positive charge
4. DA compound made of only hydrogen and carbon

How many molecules are in 2 mol of carbon dioxide?

1. A3.01 × 10²³
2. B1.20 × 10²⁴
3. C2.00 × 10²³
4. D6.02 × 10²³

A reaction has ΔH = −890 kJ/mol. What does the negative sign tell you?

1. AThe reaction needs a catalyst
2. BThe reaction is endothermic
3. CThe reaction is at equilibrium
4. DThe reaction is exothermic

Rubbing alcohol evaporates faster than water at room temperature. What does this suggest?

1. AIts intermolecular forces are weaker than water's
2. BIts molecules are heavier than water molecules
3. CIt has a higher boiling point than water
4. DIts intermolecular forces are stronger than water's

Equal volumes of 1 M HCl and 1 M NaOH are mixed. What is the approximate pH of the result?

1. A3.5
2. B1
3. C7
4. D14

A solution has a hydroxide ion concentration of 1 × 10⁻³ mol/L. What is its pH at 25 °C?

1. A7
2. B3
3. C14
4. D11