additional science aqa key words H, I, K 0.0 / 5 ? ScienceGCSEAQA Created by: SamCreated on: 15-03-13 23:51 Half-life (of a radioactive isotope) Average time taken for the number of nuclei of the isotope (or mass of the isotope) in a sample to halve 1 of 14 Hooke's Law The extension of a spring is directly proportional to the force applied, provided its limit of proportionality is not exceeded 2 of 14 Hydrated Describes a substance that contains water in its crystals, e.g hydrated copper sulfate 3 of 14 Impact time Time taken for collision to take place 4 of 14 Inert Unreactive 5 of 14 Insoluble molecules Molecules that will not dissolve in a particular solvent such as water 6 of 14 Insulating Reducing energy transfer by heat 7 of 14 Intermolecular force The attraction between the individual molecules in a covalently bonded substance 8 of 14 Ion A charged particle produced by the loss or gain of electrons 9 of 14 Ionic bonding The electrostatic force of attraction between positively and negatively charged ions 10 of 14 Ionisation Any process in which atoms become charged 11 of 14 Isomerase An enzyme that converts one form of molecule into another 12 of 14 Isotope Atom that has the same number of protons but different number of neutrons i.e it has the same atomic number but different mass number 13 of 14 Kinetic energy Energy of a moving object due to its motion; kinetic energy (J) = mass (kg) x (speed)² (m²/s²) 14 of 14
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