HL – Page 14 – Vertex Learnbox

Q-F7D10 (Set 3)

Nitrous acid, \( HNO_{2} \), is a weak acid which can be used to make acidic buffers.

Another ester was made following a similar reaction sequence.

Phosphorus is an element that is an essential part of the biological molecules involved in both respiration and photosynthesis.

Styrene has the chemical formula \( C_{8}H_{8} \) and can be represented by the following structures. Structure A is the

Recrystallization is a technique frequently used to purify solids.

Half-cells such as \( Fe^{3+}(aq)+e^{-}\rightleftharpoons Fe^{2+}(aq) \) can be connected to other half-cells to form a voltaic cell.

A teacher gave the class an experimental assignment to determine the concentration of aqueous sodium hydroxide, NaOH, using \( 2.00~mol~dm^{-3}

The graph shows the variation of the first ionization energy with atomic radius for periods 2, 3 and 4 of

A student wanted to determine what colour inks were mixed to produce black ink and their relative polarities using paper

A student was asked to identify an unknown metal with a mass of 1.28 g using calorimetry. The metal was