Chambers's Twentieth Century Dictionary. 1  n Maxim maksâ²im a general principle, serving as a rule or guide: a pithy saying: a proverb.  n Maxim maksâ²im often put for Maxâ²im-gun, an automatic machine-gun capable of firing as many as 620 rounds per minute, and of accurate shooting up to 3000 yards.
THE HYDROGENATION OF ALKENES. This page looks at the reaction of the carbon-carbon double bond in alkenes with hydrogen in the presence of a metal catalyst. This is called hydrogenation. It includes the manufacture of margarine from animal or vegetable fats and oils. Hydrogenation in the lab. The hydrogenation of ethene.
Once the reaction is ignited by a spark, these hydrocarbons burn to form CO 2 and H 2 O and give off between 45 and 50 kJ of energy per gram of fuel consumed. In the presence of light, or at high temperatures, alkanes react with halogens to form alkyl halides.Reaction with chlorine gives an alkyl chloride.lkenes and Alkynes. Unsaturated hydrocarbons such as alkenes and alkynes are much more reactive than the parent alkanes. They react rapidly with bromine, for example, to add a Br 2 molecule across the C=C double bond. This reaction provides a way to test for alkenes or alkynes.