Chemistry Practice (Interactive)

What is the electron configuration of a potassium atom (atomic number 19), and which period and group of the periodic table does it belong to?

Across Period 3 (Na to Ar), which trend is observed for first ionisation energy and what accounts for the slight decrease between magnesium and aluminium?

Using VSEPR theory, what is the molecular shape and bond angle of the sulphur hexafluoride (SF6) molecule?

Why is a molecule of ammonia (NH3) polar despite having a symmetrical arrangement of N-H bonds around the nitrogen atom?

Using Hess\'s law, the enthalpy change of a reaction can be determined indirectly. Which statement correctly describes Hess\'s law and how it is applied?

What is the pH of a solution with a hydrogen ion concentration of 5.0 x 10-3 mol L-1, and is this solution acidic, neutral, or basic?

In a titration between a strong acid and a weak base using methyl orange as an indicator, what colour change would be observed at the end point?

Which structural feature distinguishes aldehydes from ketones, and what is the functional group name for both?

In the oxidation of a primary alcohol, what reagents and conditions are typically used and what organic product is formed?

In infrared (IR) spectroscopy, which absorption range would indicate the presence of an O-H bond in an alcohol, and what characteristic would distinguish a free O-H stretch from a hydrogen-bonded O-H stretch?