C12 0.0 / 5 ? ChemistryCrude oil, cracking and hydrocarbonsGCSEAQA Created by: sophielouise277Created on: 07-02-19 17:28 What is purity? A pure substance is one that is made up of just one substance either an element or a compound 1 of 45 What is one way of testing if something is pure? The melting point and boiling points of an element or a compound are called fixed points 2 of 45 Why will the the mp + bp of a mixture vary? Depending on the composition, it will change state over a range of temps 3 of 45 What is a formulation? A mixture that has been designed to produce a useful product 4 of 45 What is one example of a formulation? Medical drugs 5 of 45 What does paint contain? Pigment, binder, solvent 6 of 45 What does the binder do? Helps paint attach itself to form a protective film when dry 7 of 45 What does the solvent do? To help the pigment and binder spread well during painting by thinning them out 8 of 45 What do washing up liquids usually contain? Surfacatant, water, colouring + fragrance, rinse agent 9 of 45 What does the surafactant do? Actual detergent that removes grease 10 of 45 What does the water do? Thin out mixture to squirt easy 11 of 45 What do the colouring and fragrance do? Improve appeal 12 of 45 What does the rinse agent do? Help water drain off crockery 13 of 45 What are some more examples of formulations? Fuels, alloys, fertilisers, pesticides, cosmetics and food products 14 of 45 What is the mobile phase? The solvent chosen 15 of 45 What is the stationary phase? The paper used 16 of 45 What is the formula for RF value? Distance moved by substance/ distanced moved by solvent 17 of 45 What is the test for hydrogen? Light splint pops 18 of 45 What is the test of oxygen? A glowing splint relights 19 of 45 What is the test for carbon dioxide? Limewater cloudy 20 of 45 What is the test for chlorine? Blue litmus paper turns white 21 of 45 How to sterilise a nichrome wire loop? Dipped in HCL and heated 22 of 45 What happens if sample contains a mixture of ions? Flame colours can be masked 23 of 45 Flame test for lithium? Love for crimson 24 of 45 Flame test for sodium? Sunflower for yellow 25 of 45 Flame test for potassium? Purple for lilac 26 of 45 Flame test for calcium? Carrot for orange-red 27 of 45 Flame test for copper? Cacti for green 28 of 45 How to test for metal positive ions? Sodium hydroxide 29 of 45 What does aluminium, calcium and magnesium all form? White precipitates 30 of 45 How do you pick out aluminium? It will dissolve in more sodium hydroxide 31 of 45 What does copper II form? Blue precipitate 32 of 45 What does iron II form? Green turns brown precipitate 33 of 45 What does iron III form? Reddish-brown precipitate 34 of 45 How to test for carbonates? Add dilute acid and if it fizzes and produces CO2 35 of 45 What do most carbonates do and what are the exceptions? Don't dissolve in water, Group 1 carbonates do tho. 36 of 45 How to test for halides? Add dilute nitric acid and then silver nitrate 37 of 45 What do bromide ions give? Cream 38 of 45 What do iodide ions give? Yellow 39 of 45 What do chloride ions give? White 40 of 45 How to test for sulfates? Dilute HCL + barium chloride 41 of 45 What is formed always? White precipitate 42 of 45 What are benefits of modern instrumental methods? Higher accurate, quicker and small samples can be analysed 43 of 45 What are the disadvantages of modern instrumental methods? Expensive, special training, results that can often only be interpreted by comparison 44 of 45 How does flame emission spectroscopy work? Sample heated, electrons move into higher energy levels, when fall back energy released as light energy 45 of 45
Comments
No comments have yet been made