D

Data     The results and information that has been collected form an experiment

Datalogger     A device that can be linked to a computer to record the results from an experiment automatically.

Decomposition     A reaction where one substance breaks down into two or more new substances. An example of a decomposition is heating calcium carbonate to produce calcium oxide and carbon dioxide

Density     The mass of a body divided by its volume. Something has a high density of it is heavy but only small. Diagonal relationship The properties of lithium and magnesium are similar in many ways. The same goes for aluminium and beryllium.

Diffusion     Particles spread out and mix. This occurs in both gases and liquids but goes faster in gases.

Displacement reaction     Sometimes called a “reactivity series reaction” this is where a reactive metal takes the place of an unreactive one in a compound. Look at this example (zinc is more reactive than copper or you could say that zinc is higher in the reactivity series than copper):

zinc + copper sulfate goes to make zinc sulfate + copper

Dissolving     A solid breaks down and spreads out through a liquid. The solute (the one that gets dissolved) particles are so small that they can pass through filter paper.

Distillation     A liquid is separated from its solution by heating it so that the liquid evaporates and then cooling the vapour so that it condenses somewhere else.

Diamond     One of the allotropes of carbon. Allotropes have the atoms of the same element but arranged in a different way.

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