Karteikarten
Topic 25&26 Qualitive Anaylisis - Triple Paper 2 (edexcel GCSE)
Karten in diesem Stapel (38)
- 1Are bases corrosive?Yes
- 2Are acids corrosive?Yes
- 3What does a litmus test tell us?If the substance is acidic or basic (be careful it doesn't tell you how acidic it is - the ph level.)
- 4What is a precipitation reaction?The formation of a solid from mixing two soluble solutions
- 5What does it mean if a substance is soluble?Substance that can dissolve in water
- 6True or False: Most hydroxides are insoluble.True - but the exception is group 1 metals
- 7Define HydrocarbonA compound that contains hydrogen and carbon atoms only
- 8Give the cation and flame colour of - LithiumLi+ & red
- 9Give the cation and the flame colour of - SodiumNa+ & orange
- 10Give the cation and the flame colour of - Potassiumk+ & lilac
- 11Give the cation and the flame colour of - CalciumCa2+ & yellow-red
- 12Give the cation and the flame colour of - CopperCu2+ & green-blue
- 13List the steps of testing for positive ions1. Clean the loop with HCL
2. dip it in the metal
3. Put it over the flame and identify what ion it is
4. Clean the loop with HCL
5. Repeat steps 1-5 - 14State why flame photometry works better1. It can detect smaller amounts (sensitivity)
2. Accuracy
3. Its faster
4. Can separate mixtures of colours into an emission spectre. - 15Which ion is this - Fe2+Iron (II)
- 16Which metal ion give out a precipitate color of brown/redIron (III)
- 17What do you have to do if you have two white precipitates formed?You add excess sodium hydroxide to see if it is aluminium or calcium
- 18How do you know if the metal ion is Aluminium or Calcium?Add excess sodium hyroxide if it turns back to a colourless solution then it is aluminium, if it stays white it is calcium
- 19State the chemical equation for copper nitrate mixed with sodium hydroxidecopper nitrate + sodium hydroxide --> copper hydroxide + sodium nitrate
Cu (NO3)2 (aq) + NaOH (aq) --> Cu (OH)2 (s) + NaNO3 (aq) - 20what is the net ionic equation for Cu (NO3)2 (aq) + NaOH (aq) --> Cu (OH)2 (s) + NaNO3 (aq)Cu2+ (aq) + 2OH- ---> Cu(OH)2
- 21How do you find a net ionic equation?Simplify the equation then cross out all the things that are the same apart from the solid compound and the things that make up the solid compound
- 22Explain how you test for carbonates1. add a dilute acid
2. if it FIZZESthe test is positive for carbonate
Metal carbonate + acid --> salt + carbon dioxide + water - 23Explain how you test for sulphates1. add dilute hydrochloric acid
2. add borium chloide
3. If white precipitate is formed, the test is positive for sulphates
Ba2+ (aq) + SO4 2- (aq) --> BaSO4 (s) - 24Explain how you test for halides1. add dilute nitric acid (this acidifies the solution and removes any carbonate ions that might give a precipitate)
2. add silver nitrate
3. if precipitate is formed then the test is positive for halides - 25What are halogens?Group 7 non-metals
- 26Describe the hydroxide precipitate test for metal cations1. dissolve a little solid salt in a test tube using distilled water
2. Add a few drops of dilute sodium hydroxide
3. record the colour of the precipitate formed (if white add excess solution to see if it will disappear and leave a clear solution) - 27state some properties of clay ceramicsChemically unreactive, hard, stiff but brittle, poor eletrical and themal conductors, have high melting points and consist of giant structures with many strong bonds (covalent or ionic)
- 28define polymersubstances with high average relative formula masses
- 29define monomersmaller molecules that join together to form repeating unit
- 30State some properties of polymersstrong, chemically unreactive, poo electrical and chemical conductors
- 31State some properties of some metalshard, shiny solids, high melting points, good electrical and thermal comductors, malleable (pressed into shapes without breaking)
- 32what is 'a mixture of two or more mateials that have opposite properties (to hide weakness)'A composite material
- 33Define tensile strengthlower tensile strength - more bendable
higher tensile strength - not so bendable - 34Define compressive strengthHow well a material resists being squashed
- 35Define nanoparticlea piece of material that consists of a few hundred atoms, usually 1nm - 100nm
- 36cube-shaped nanoparticle has sides of 20nm. calculate its total surface area, its volume, and surface area to volume ratiototal surface area = 6 x 20 x 20
volume = 20 x 20 x 20
suraface area to volume ratio = (6x20x20) / (20x20x20) - 37If the total surafce area to volume ratio is higher what does that mean?That there is more...
- 38What are the uses of nanoparticles dependent on?- very small size
- the total surface area to volume ratio
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- Beschreibung
- Tests for ions, bulk and surface properties for matter including Nanoparticles Edexcel GCSE
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- jadah Jacobs
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