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Question 1

Calculate the radius of a spherical drop of liquid mercury of mass 0.649 g. The density of mercury is 1.36 × 10⁴ kg^m-3.

a) 2.25 mm

b) 0.107 mm

c) 87.1 μm

d) 3.67 mm

Question 2

Calculate the Coulombic potential energy of an electron at a distance of 52.9 pm from the nucleus of a helium atom.

a) +4.36 × 10^-18 J

b) -4.36 × 10^-18 J

c) -8.72 × 10^-18 J

d) +17.4 × 10^-18 J

Question 3

A photoelectron has a kinetic energy of 3.588 × 10^-19 J. What is its speed?

a) 443.7 × 10³ m ^-1

b) 883.9 × 10³ m s^-1

c) 1.220 × 10⁹ m s^-1

d) 20.79 × 10³ m s^-1

Question 4

A lump of gold of volume 127 mm³ has a mass of 2.45 mg. Calculate the density of gold.

a) 19.3 × 10^-6 kg m^-3

b) 19.3 × 10^-3 kg m^-3

c) 19.3 × 10³ kg m^-3

d) 19.3 × 10⁶ kg m^-3

Question 5

In a barometer, pressure is determined by measuring the height of a column of liquid. Calculate the pressure, in units of Pa, at the bottom of a 347 mm high column of paraffin oil, of density 0.798 g cm^-3.

a) 2.720 Pa

b) 2720 Pa

c) 2720 kPa

d) 2720 MPa

Question 6

Calculate the amount of substance in 10.1 g of glucose, C₆H₁₂O₆.

a) 17.8 mol

b) 0.0295 mol

c) 10.1 mol

d) 0.0561 mol

Question 7

A solution is made by dissolving 13.4 g of hydrated copper nitrate, Cu(NO₃)₂.3H₂O, in water and making up to a volume of 250 cm³. What is the concentration of nitrate ions in the solution?

a) 0.444 mol dm^-3

b) 0.222 mol dm^-3

c) 0.286 mol dm^-3

d) 0.571 mol dm^-3

Question 8

Estimate the concentration of a dilute aqueous solution of molality 0.124 kg mol^-1 at standard ambient temperature and pressure.

a) 0.124 mol dm^-3

b) 1.24 mol dm^-3

c) 12.4 mol dm^-3

d) 0.0124 mol dm^-3

Question 9

Calculate the mole fraction of solute molecules in a dilute aqueous solution of concentration 50.0 mmol dm^-3.

a) 2.775 × 10^-3

b) 0.900 × 10^-3

c) 0.236 × 10^-3

d) 1.947 × 10^-3

Question 10

The vapour pressure above a sample of liquid water at 80°C is 355 Torr. Express this pressure in units of kPa.

a) 47.3

b) 0.355

c) 4.44

d) 28.4 kPa

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