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.
1. a. The writer of a book, article, or other text. b. One who practices writing as a profession. 2. One who writes or constructs an electronic document or system, such as a website. 3. An originator or creator, as of a theory or plan. 4. Author God.oun. 1. author-writes (books or stories or articles or the like) professionally (for pay). writer. communicator-a person who communicates with others. abstracter, abstractor-one who makes abstracts or summarizes information. alliterator-a speaker or writer who makes use of alliteration.