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WordDefinitionTopicalloyAn alloy is a compound of two or more elements, at least one of which is a metal.Useful products from rocksanodeAn anodes is the electrode (electrical conductor) attached to the positive terminal of a battery.Useful products from rocksatomAll elements are made of atoms. An atom consists of a nucleus containing protons and neutrons, surrounded by electrons.Useful products from rocksbrittleIf something is brittle it is easily broken.Useful products from rockscatalystA catalyst changes the rate of a chemical reaction without being changed by the reaction itself.Useful products from rockscathodeA cathodes is the electrode (electrical conductor) attached to the negative terminal of a battery.Useful products from rockscompoundA compound is a substance formed by the chemical union (involving bond formation) of two or more elements.Useful products from rockscorrodeTo deteriorate (get weaker) due to the action of water, air, or an acid.Useful products from rockscrustThe crust is the outermost layer of the Earth.Useful products from rocksdecomposeIf a substance decomposes, it breaks down into simpler compounds or elements.Useful products from rocksdisplacement reactionsDisplacement reactions happen when a more-reactive element replaces a less-reactive element in a compound.Useful products from rockselectrodeElectrodes are conductors used to establish electrical contact with a circuit. The electrode attached to the negative terminal of a battery is called a negative electrode, or cathode. The electrode attached to the positive terminal of a battery is the positive electrode, or anode.Useful products from rockselectrolysisElectrolysis is the decomposition (separation or break-down) of a compound using an electric current.Useful products from rockselectrolyteAn electrolyte is a substance which in solution will conduct an electric current.Useful products from rockselectronAn electron is a very small negatively-charged particle found in an atom in the space surrounding the nucleus.Useful products from rockselementAll atoms of an element have the same atomic number, the same number of protons and electrons and so the same chemical properties.Useful products from rocksexothermicHeat energy is released in an exothermic reaction. We know this because the surroundings get warm.Useful products from rocksionsCharged particles formed by loss or gain of electrons. When atoms lose an electron they become a positive ion. When they gain an electron they become a negative ion.Useful products from rocksionic substancesIonic substances form when a metal reacts with a non-metal. They contain charged particles called ions.Useful products from rocksmalleableIf a material is malleable it is capable of being hammered or pressed out of shape without being likely to break or return to the original shape.Useful products from rocksmoltenMolten means reduced to liquid form by heating. It is mainly used to describe rock, glass or metal.Useful products from rocksoreAn ore is a rock containing enough quantities of a mineral that it is profitable to extract it.Useful products from rocksoxidationOxidation is a reaction in which oxygen combines with a substance. Oxidation also means a loss of electrons.Useful products from rocksproductA product is a substance formed in a chemical reaction.Useful products from rocksreductionReduction is a reaction in which oxygen is removed from a substance. Reduction also means a gain in electrons.Useful products from rocksslagSlag is the non-metallic by-product resulting from the extraction of metals such as iron from their ores.Useful products from rockssterilizeTo sterilize means to make something free from micro-organisms such as bacteria.Useful products from rocksthermal decompositionA reaction in which substances are broken down by heat.Useful products from rocks