Question 17 (4 marks) (a) Draw the Lewis electron dot structure for the compound, hydrogen fluoride, HF. (1 mark) H F (b) Hydrogen fluoride reacts with water according to the following equationâ¦ HF (l) + H 2 O (l) â H 3 O +(aq) + F â(aq) At room temperature pure hydrogen fluoride exists as a liquid.his shows that water is made up of more than one type of atom. (1 mark) âº The two substances obtained were in definite ratio of 2:1 as shown by the 2:1 ratio of the gas volumes. (1 mark) (ii) State another observation that shows that electrolysis is a chemical change.
Definition of columnist for English Language Learners. : a person who writes a newspaper or magazine column.
to analyze (something, as a speech or behavior) to discover its implications or uncover a deeper meaning: Political columnists were in their glory, parsing the president's speech on the economy in minute detail. 4. Computers. to analyze (a string of characters) in order to associate groups of characters with the syntactic units of the underlying grammar. verb (used without object), parsed, parsing.