large molecule formed when many smaller molecules bond together. Qualitative Tests IGCSE Combined Science. Quizlet will be unavailable from 4-5 PM PT. 7 terms. in microscopes, the ability to form images with fine detail. A long glass tube with a tap at one end and markings to show volumes of liquid, used to add precisely known amounts of liquids to a solution in a conical flask below it. a practical test of something new or unknown to discover its effectiveness. 3 0 obj A chart with rectangular bars with lengths proportional to the values that they represent. 21 terms. emilyregan2020. Potassiums structure is 2.8.8.1. an organic compound containing only carbon and hydrogen. AQA GCSE Chemistry … Acids are proton (H+ ion) donors. The minimum amount of energy needed to start a reaction. If a systematic error is suspected, the data should be repeated using a different technique or a different set of equipment, and the results compared. chemistry revision cards. This is a list of important chemistry vocabulary terms and their definitions. Unsaturated hydrocarbon which contains a carbon-carbon double bond. The attraction between 2 atoms that share one or more pairs of electrons. Click on each letter to find the words with that initial. An element cannot be broken down chemically into any simpler substances. On Saturday, October 10th, we'll be doing some maintenance on Quizlet to keep things running smoothly. Learn about and revise chemical symbols and formulae and word equations with this BBC Bitesize GCSE Chemistry (AQA) study guide. The line should normally be a line of best fit, and may be straight or a smooth curve. an equation in which the reactants and products in a chemical reaction are represented by words. The chemical opposite of an alkali. Bonding electron that is no longer associated with any one particular atom. light intensity. The Group Number equals the number of electrons in the outer shell, The rows of the Periodic Table. A measure of a fluid's thickness or resistance to flow. E.g. Also called a bar graph. The ratio of the actual yield to the theoretical yield, multiplied by 100. A variable which can affect the outcome of the investigation, and therefore has to be monitored. parent ion peak--peak furthest to the RIGHT-represents the initial molecular cation=molecular weight of the original molecule. It lowers the activation energy of the reaction, The sum of the atomic masses of elements in a compound. device containing an ion exchange resin that is used to 'exchange' calcium and magnesium ions for sodium ions making hard water softer. definitions for igcse, Temperature at which a solid turns into a liquid, Temperature at which a liquid changes into a solid, Temperature at which a liquid changes into a vapour at atmospheric pressure, The random movement of particles from an area of a high concentration to an area of low concentration, Separating an insoluble solid from a liquid, The material that dissolves in a solvent to form a solution, The mixture formed when a solute dissolves in a solvent, The liquid in which the solute dissolves to form a solution, Separating liquids of different boiling points by evaporation and condensing, The coating of iron by zinc to protect from rusting. <>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 595.32 842.04] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> It will be very hard to answer all the questions in the paper without knowing these key terms and definitions. All the sciences have special words that you need to understand. Learn about and revise calculations in chemistry with this BBC Bitesize GCSE Chemistry (AQA) study guide. Any indication that a measuring systemgives a false reading when the true value of a measured quantity is zero, e.g. Hydrocarbons with similar boiling points separated from crude oil. Metal hydroxides, oxides and carbonates are all bases, They have a pH less than 7 and neutralize bases or alkalis to form salt and water. E.g. A factor that can change in an experiment. water is made from hydrogen and oxygen (H2O). The huge reaction vessels used in industry to extract iron form its ore. A covalent bond made by the sharing of 2 pairs of electrons. The circular motion of matter caused by heating in fluids. Materials that can be broken down by microorganisms. Chemistry Definitions. describes evidence that can be seen independently by others if they repeat the same experiment or observation in the same way. The electrostatic force of attraction between oppositely charged ions. a statement made in advance that expresses the results that will be obtained from testing a hypothesis if the hypothesis is supported; the expected outcome if a hypothesis is accurate. Number assigned to a food additive that has been approved for use in Europe. An atom or group of atoms that give organic compounds their characteristic reactions. A substance which helps keep immiscible liquids (e.g. definitions for igcse Learn with flashcards, games, and more — for free. Identifying ions in substances GCSE Chemistry AQA. A mixture of metals (and sometimes non metals). The study of molecules and nanostructures whose size ranges from 1 to 100 nanometers (one billionth of a meter). Causes readings to be spread about some value other than the true value, due to results differing from the true value by a consistent amount each time a measurement is made. The simplest ratio of elements in a compound. E.g. chemistry revision cards. Systematic errors cannot be dealt with by simple repeats. Crystalline and containing water molecules. Rock tha contains a high proportion of a copper compound. All the elements in each column (labelled 1 to 7 and 0) down the periodic table. The bars should be of equal width and are usually plotted vertically or horizontally. Alloy of iron containing controlled small amounts of carbon. water that is not hard (does not contain salts that interfere with the formation of lather with soap). If the investigation is of the survey type a control group is established to serve the same purpose. It is liquid at room temperature. Biology Chapter 2: Chemistry. Makes OH- ions in water. stainless steel which contains nickel and chromium. Using plants to absorb metals from the ground. The precipitate formed when soap reacts with calcium and/or magnesium ions in hard water. To watch closely and frequently; to observe and make notes. A table that shows the elements, their atomic number, symbol, and average atomic mass; elements with similar chemical properties are grouped together. This occurs when the hydrocarbon vapour is either passed over a hot catalyst or mixed with steam and heating to a high temperature. The variable for which the value is measured for each and every change in the independent variable. The effect of random errors can be reduced by making more measurements and calculating a new mean. A fair test is one in which only the independent variable that has been allowed to affect the dependent variable. %PDF-1.5 A substance that speeds up a chemical reaction but remains chemically unchanged itself at the end of the reaction. Separation of many substances in a mixture by heating, using the fact that they have different boiling points. the layer of the earth between the crust and the core. Lithium. It can be used as a cheap alkali in industry.

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