OCR A LEVEL CHEMISTRY Study guides, Class notes & Summaries

Half life correct answers The time taken for half of a reactant to be used up Exponential decay correct answers A constant half life with the concentration halving every half life Homogeneous equilibrium correct answers Contains equilibrium species that all have the same state or phase Heterogeneous equilibrium correct answers Contains equilibrium species that have different states of phases Buffer solution correct answers A system that minimises pH changes when small amounts of an a...

Electronegativity correct answers The tendancy of an atom to attract the bonding pair of electrons in a covalent bond Radical correct answers A molecule, atom or ion with an unpaired electron Acid (bronsted lowry theory) correct answers A molecule or atom that can donate a proton Base correct answers A molecule or atom which can act as a proton acceptor Alkali correct answers A water soluble base Standard Conditions correct answers 298 K, 100 kPa, 1 moldm^-3 Standard enthalpy c...

QUESTIONS AND ANSWERS

QUESTIONS AND ANSWERS

5.1 Rates, equilibrium and pH 5.1.1 Orders, rate equations and rate constants (page 13) 1 (a) R: zero order S: 2nd order (b) T: 1st order rate = k[S]2 [T] 2 (a) Rate quadruples (b) Rate triples (c) Rate increases by 27 times 3 k = 8.3 × 104 dm3 mol−1 s −1 5.1.2 Concentration–time graphs (page 15) 1 (a) The graph plotted should appear as follows. (b) The graph is curved and would suggest the decomposition of H2O2 is first order. (c) The concentration halves every 27 second...