SACE Stage 2 Chemistry: mixed exam-style practice quiz

The pH of a 0.0025 mol L$^{-1}$ solution of hydrochloric acid is closest to:

A cleaning solution has $[\text{OH}^-] = 1.0 \times 10^{-3}$ mol L$^{-1}$ at 25 °C. Its pH is:

0.50 mol of $\text{H}_2$ and 0.50 mol of $\text{I}_2$ are sealed in a 1.00 L flask: $\text{H}_2(g) + \text{I}_2(g) \rightleftharpoons 2\text{HI}(g)$. At equilibrium, 0.78 mol of HI is present. Kc is closest to:

For the equilibrium $\text{A}(g) \rightleftharpoons \text{B}(g)$, raising the temperature at constant volume increases the concentration of B at the new equilibrium. What can be concluded?

0.50 g of sodium chloride is dissolved in water to make 250 mL of solution. Its concentration in percent weight per volume (% w/v) is:

A 1.5 L water sample contains 3.0 mg of lead. The lead concentration in ppm is:

A 25.00 mL sample of sodium hydroxide is titrated with 0.100 mol L$^{-1}$ sulfuric acid. The average titre is 21.50 mL. The concentration of the sodium hydroxide is:

On a thin layer chromatography plate, a dye spot moves 2.4 cm from the origin while the solvent front moves 6.0 cm. The Rf value is:

In a calorimetry experiment, 100 g of water is heated from 21.0 °C to 33.0 °C. The heat absorbed by the water is closest to:

Which statement correctly describes the effect of adding a catalyst to a reaction, as shown on an energy profile diagram?

A student's experimental molar enthalpy of combustion of ethanol is -1160 kJ per mol, while the accepted value is -1367 kJ per mol. Which is the most likely cause of the difference?

Methane ($\Delta H_c = -890$ kJ mol$^{-1}$, $M = 16.0$ g mol$^{-1}$) and octane ($\Delta H_c = -5470$ kJ mol$^{-1}$, $M = 114$ g mol$^{-1}$) are compared as fuels. Which statement is correct?