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level: In the lab

Questions and Answers List

level questions: In the lab

QuestionAnswer
What is the reaction to make Carbon Dioxide in lab?Calcium Carbonate + Dilute hydrochloric acid
What is the reaction to make Hydrogen in lab?Zinc + Dilute hydrochloric acid
What is the reaction to make Oxygen in lab?Manganese (VI) Oxide(Catalyst) added to Hydrogen peroxide
When is upward displacement used ? Give examples for the Gases collected through this method.When gas is heavier than air Carbon Dioxide Sulfur dioxide Hydrogen chloride
When is downward displacement used ? Give examples for the Gases collected through this method.When gas is lighter than air Ammonia Hydrogen
When overwater used ? Give examples for the Gases collected through this method.When gas is sparingly soluble in water Carbon dioxide Hydrogen Oxygen
When is a gas syringe used?To measure the volume accurately, it can be used for an gas
What is the test for carbonates ?Add dilute acid Effervescence(Carbon Dioxide) can be observed
What is the test for Sulfates?Acidify with dilute nitric acid then add aqueous Barium Nitrate White precipitate, insoluble in Nitric acid
What is the test for chlorides?Acidify with dilute nitric acid , then add silver nitrate White precipitate is formed
What is the test for Bromides?Acidify with dilute nitric acid, then add silver nitrate Cream precipitate is formed
What is the test for Iodides ?Acidify with dilute nitric acid, then add silver nitrate Yellow precipitate is formed
What is the test for nitrates ?Add aqueous Sodium hydroxide, then add aluminium foil, and heat carefully Ammonia rpoduced
What is the test for Ammonia ?Turns damp red litmus paper blue
What is the test for Chlorine?Bleaches damp litmus paper
What is the test for Oxygen ?Relights a glowing splint
What is the test for Hydrogen?Pops with alighted splint
What is the test for Carbon Dioxide?Turns limewater milky
What are the effects of Sodium Hydroxide and Aqueous Ammonia is the cation present is Calcium?White precipitate insoluble in excess No precipitate
What are the effects of Sodium Hydroxide and Aqueous Ammonia is the cation present is Aluminium?White precipitate soluble in excess White precipitate insoluble in excess
What are the effects of Sodium Hydroxide and Aqueous Ammonia is the cation present is Zinc?White precipitate soluble in excess White precipitate soluble in excess
What are the effects of Sodium Hydroxide and Aqueous Ammonia is the cation present is Iron(II)?Green precipitate insoluble in excess Green precipitate insoluble in excess
What are the effects of Sodium Hydroxide and Aqueous Ammonia is the cation present is Chromium(III)?Green precipitate soluble in excess(Green solution) Green precipitate insoluble in excess
What are the effects of Sodium Hydroxide and Aqueous Ammonia is the cation present is Copper(II)?Light blue precipitate insoluble in excess Light blue precipitate soluble in excess( Dark blue solution)
What are the effects of Sodium Hydroxide and Aqueous Ammonia is the cation present is Iron(III)?Red-brown precipitate insoluble in excess Red-brown precipitate insoluble in excess
What are the effects of Sodium Hydroxide and Aqueous Ammonia is the cation present is Ammonium?Ammonia produced on warming -
Why is dilute nitric acid added to anion tests?In order to remove an Carbonate ions that might be present, they would also produce a white precipitate giving a false positive result
What is the test for water ?Turns white anhydrous copper(II) sulfate blue Turn blue cobalt(II) chloride pink