displacement - a type of reaction that causes a less reactive element to be removed by a more reactive element, anomalous - a result that does not fit the pattern of other results, neutralisation - a reaction between an acid and an alkali that creates a salt and water, thermometer - equipment used to measure temperature, mean - a type of average, calculated by adding up all the numbers and then dividing the total by how many numbers there are, reactivity - elements can be put in this order depending on how much gas, bubbles, flames and colours they release during a reaction ,

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