Chemical Reactions

1. 1What is the method of testing that there is starch present? And what is it's positive result?

   1. AAdd a few drops of Iodene solution in the solution of food - positive result should be blue black
   2. BAdd ethenol to the food solution - a white emulsion should form if positive
2. 2What is the test to see if protein is present? and what is its positive result?

   1. AAdd iodene to the food solution - should turn purple if test is positive
   2. BAdd an equal amount of sodium hydroxide to the food solution and mix carefully, then add a few drops of copper sulphate - positive result is violet halo/purple
3. 3What is the test to see if reducing sugar is present and what is its positive result?

   1. Aadd Buiret solution to the food solution and mix - positive result is green
   2. BAdd Benedict's solution to the food solution and boil carefully - positive result is brick red
4. 4What is the test to see if fat is present and what is the positive result?

   1. ADissolve the food in ethanol, then add distilled water - a white emulsion should form if positive result
   2. BAdd Benedict's solution and stir - solution should turn yellow if positive result
5. 5What is the test for Carbonate (CO32-) and what is the result?

   1. AAcidify and add sodium chloride - should produce fizzing and sodium carbonate is produced
   2. Badd dilute acid - effervescence, carbon dioxide is produced (turns limewater milky)
6. 6How do you test for ammonia (NH3) and what is the result?

   1. Aturns damp litmus paper blue
   2. Badd aqueous sodium hydroxide - ammonia produced on warming
7. 7What is the result of testing Iron II (Fe3+) un aqueous sodium hydroxide?

   1. AGreen ppt., insoluble in excess
   2. BBlue ppt., insoluble in excess
8. 8What is the result in testing Copper II (Cu2+) in aqueous ammonia?

   1. Awhite ppt., soluble in excess giving a cloudy solution
   2. Blight blue ppt., soluble in excess giving a dark blue solution
9. 9what is the result in testing ammonium (NH4+) in aqueous sodium hydroxide?

   1. Aammonia produced on warming
   2. Bwhite ppt., insoluble in excess
10. 10What is the test for nitrate (NO3-) [in solution] and what is the result?

    1. Aacidify with sulphuric acid and then add silver nitrate - white ppt.
    2. Badd aqueous sodium hydroxide then aluminium foil; warm carefully - ammonia produced (turns damp litmus paper blue)

11. 11what is the result in testing zinc (Zn2+) in aqueous ammonia?

    1. Awhite ppt., soluble in excess giving a colourless solution
    2. Bwhite ppt., insoluble in excess
12. 12what is the result in testing zinc (Zn2+) in aqueous ammonia?

    1. Awhite ppt., soluble in excess giving a colourless solution
    2. Bwhite ppt., insoluble in excess
13. 13What is the test and result of oxygen (O2)

    1. Arelights a glowing splint
    2. Bpops with a glowing splint
14. 14what is the result when testing iron III (Fe3+) with aqueous sodium hydroxide?

    1. Ared - brown ppt., soluble in excess giving a brown solution
    2. Bred - brown ppt., insoluble
15. 15what is the result when testing zinc (Zn2+) in aqueous sodium hydroxide?

    1. Awhite ppt., soluble in excess giving a colourless solution
    2. Bwhite ppt., insoluble in excess
16. 16what is the test and result for carbon dioxide (CO2)?

    1. Aturns limewater milky
    2. Bturns damp litmus paper red
17. 17what is the test and result of chloride (Cl-) [in solution]?

    1. Ableaches damp litmus paper
    2. Bacidify with dilute nitric acid and then add aqueous silver nitrate - white ppt.
18. 18what is the result in testing copper II (Cu2+) in aqueous sodium hydroxide?

    1. Alight blue ppt., insoluble in excess
    2. Blight blue ppt., soluble in excess giving a colourless solution
19. 19What is the test and result of sulphate (So42-) [in solution]?

    1. Aacidify then add aqueous barium chloride or aqueous barium nitrate - white ppt.
    2. Badd dilute acid - effervescence oxygen is produced
20. 20What is the result when testing Iron II (Fe2+) with aqueous ammonia?

    1. Awhite ppt., insoluble in excess
    2. Bgreen ppt., insoluble in excess
21. 21What is the test and result for hydrogen (H2)?

    1. A"pops" with a lighted splint
    2. Bturn damp litmus paper blue
22. 22What is the result when testing iron III (Fe3+) with aqueous ammonia?

    1. Ared-brown ppt., insoluble in excess
    2. Bblue ppt., soluble in excess giving a blue solution
23. 23what is the test and result for chlorine (Cl2)?

    1. Arelights a glowing splint
    2. Bbleaches damp litmus paper

Description

Food tests, gas tests and anions & cation tests

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lisannehoeve

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