OCR A Level Chemistry - Paper 1 2022 Advanced Info Questions with 100% Correct Answers

What is Avagadro's constant? Correct Answer 6.02 x 10^23 number of particles in a mol Define empirical formula Correct Answer The simplest whole number ratio of atoms of each element present in a compound Define molecular formula Correct Answer The number and type of atoms of each element in a molecule What is water of crystallisation? Correct Answer Water molecules that are bonded into a crystalline structure of a compound What is the ideal gas equation? What are the units of each term? Correct Answer pV= nRT - p = Pa, V = m3, n = mol, R = J/K/mol, T= K How do you determine percentage yield? Correct Answer Percentage yield = (actual yield/theoretical yield) x 100 What is atom economy? Correct Answer Atom economy = (mass of desired product/mass of total product) x 100 Why is a high atom economy important? Correct Answer Less waste, more cost effective, more sustainable, often more energetically favourable conditions are used Define a transition element Correct Answer An element which forms at least one ion with a partially filled d-orbital - cannot have a full d subshell Name 2 period 4 elements that are not transition elements Correct Answer Zinc and Scandium State 3 chemical properties which are characteristic of transition elements Correct Answer They form coloured ions, they are good catalysts and they can have one or more oxidation states in compounds Define ligand Correct Answer An atom, ion or molecule that donates a pair of electrons to a central metal atom or ion Define complex ion Correct Answer A complex ion is a metal ion surrounded by coordinately bonded ligands