additional science aqa key words Q, R 3.0 / 5 based on 1 rating ? ScienceGCSEAQA Created by: SamCreated on: 17-03-13 22:35 Quadrat A piece of apparatus for sampling organisms in the field. 1 of 18 Quantitative sampling Sampling that records the numbers of organisms rather than just the type 2 of 18 Radioactive dating The use of a radioactive substance to give information about the age of an object 3 of 18 Range The maximum and minimum values of the independent or dependent variables; important in ensuring that any pattern is detected 4 of 18 Recessive The characteristics that will show up in the offspring only if both of the alleles are inherited 5 of 18 Red giant A star that has expanded and cooled resulting in it becoming red and much larger and cooler than it was before it expanded 6 of 18 Reduction A reaction in which oxygen is removed (or electrons are gained) 7 of 18 Relative atomic mass,A The average mass of the atoms of an element.The average mass must take into account the proportions of the naturally occurring isotopes of the element 8 of 18 Relative formula mass, M The total of the relative atom masses, added up in the ratio shown in the chemical formula, of a substance 9 of 18 Repeatability (of data) We can improve the accuracy of data by repeating measurements and calculating the mean (having retested or discarded any anomalous results) 10 of 18 Repel To cause to move apart 11 of 18 Reproducibility (of data) the consistency of data that is collected when different people carry out the same investigation 12 of 18 Residual current circuit breaker (RCCB) An RCCB cuts off the current in the live wire when it is different from the current in the neutral wire 13 of 18 Resistance Resistance (Ω) = potential difference (V) ÷ current (A) 14 of 18 Resultant force The combined effect of the forces acting on an object 15 of 18 Retention time The take it takes a component in a mixture to pass through the column during gas chromatography 16 of 18 Reversible reaction A reaction in which the products can re-form the reactants 17 of 18 Ribosome The site of protein synthesis in a cell 18 of 18
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