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Exothermic and Endothermic Reactions. The diagram shows some magnesium ribbon burning. endothermic exothermic . neutralisation . reduction. electrical heat light movement . oxygen . sound. Choose some of the words from the box to complete the sentences below. a The speed of light is 299,792,458 m/s. For many calculations, two or three significant figures are sufficient. Using scientific notation, two significant figures, and rounding (p. 18), the speed of light is 3.0 108 m/s. The conversion is illustrated using simpler numbers: 6200 6.2 1000 6.2 103 or A Review of Mathematics