One hectare comprises between 1.2 and 1.6 football pitches, as soccer fields are known in British English. An internationally-sanctioned soccer field is 100 to 110 meters in length by 64 to 75 meters in width, comprising between 0.62 and 0.82 hectares depending on the field. Keep Learning.
From Wikipedia, the free encyclopedia. Alkaliâaggregate reaction is a term mainly referring to a reaction which occurs over time in concrete between the highly alkaline cement paste and non-crystalline silicon dioxide, which is found in many common aggregates.he alkaliâaggregate reaction is a general, but relatively vague, expression which can lead to confusion. More precise definitions include the following: 1  Alkaliâsilica reaction (ASR, the most common reaction of this type); 2  Alkaliâsilicate reaction, and; 3  Alkaliâcarbonate reaction.
Method (a) Making a salt by neutralising a soluble acid with a soluble base (alkali). Method (b) Making a salt by from an acid with a metal or insoluble base oxide, hydroxide or carbonate. Method (c) Preparing an insoluble salt by mixing solutions of two soluble compounds.or more on ionic equations see How to write equations and Making salts by precipitation. Tests for NON METAL IONS anions (negative ions). Tests to detect and identify halide ions X, the negative ions (anions) formed from the halogens, chloride, bromide and iodide.