ElectrolysisBrine.gifElecNaClAnim.gifA GCSE Science-CHEMISTRY worksheet on The electrolysis of salt solution and uses of the products

Site Meter * Do online OR printout, do, return to check answers. * GCSE Notes on Group 7 The Halogens * AQA * CCEA * Edexcel * OCR 21stC * OCR Gateway * WJEC * EMAIL comment?query * Doc Brown's Chemistry Clinic updated 10-06-09 *

   acid      alkali      bleach      blue      brine      bubbles      ceramics      chlorine      colourless      detergents      electricity      electrodes      film      good      green      hydrochloric      hydrogen      hydroxide      lit      litmus      photographic      poor      purple      PVC      silver      sodium      splint   
Q1(a) When salt is dissolved in water, the solution is called .
(b) Water is a conductor, but the free ions from the salt make it a conductor.
(c) If is passed through gas form at both .

Q2(a) Gas 1 looks and gives a squeaky pop with a and so is .
(b) Gas 2 looks and bleaches and so is .

Q3(a) The universal indicator turned from green to showing an was formed.
(b) The product left in solution is called .

Q4(a) Water is treated with to kill bacteria.
(b) Chlorine and are combined to make hydrogen chloride and when this is dissolved in water it makes with a pH of 1.
(c) Chlorine is used to make the plastic .
(d) The manufacture of ammonia and margarine uses .

Q5(a) Sodium hydroxide and chlorine are used to make , so handle with care!
(b) The silver salts of the halogens, eg silver chloride are used in the manufacture of . When light falls on the silver halide, metallic is formed.
(c) Sodium hydroxide is also used in the manufacture of in pottery and washing up liquid .