Question

ne. UP Sugar Jecau repa bout cam We consisting of many glucose Lules linked together. Iodine (IKI) is added to detect the presence of starch. The iodine molecules ger stuck in the spirals of the starch molecule and cause a blue-black color to appear. A red color is an indica lack color of the star the indime sad edit rum ace Name: Lab Questions from Week 3. Fill in the following: To test for the following: Reagent/indicator Test name Section Lipids Negative observation - result (what did you see with negative control) Positive observation + result Carbohydrates- simple/reducing sugars Proteins Carbohydrates - starch Organic or Inorganic 2 ml sucrose 2 mi ml 10% HCI (control) 2 ml

Answer 1

Lipids	emulsion test	no formation of cloud when decanted with water no presence of lipids	formation of cloud when decanted with the watera lipids don't dissolve in water
Carbohydrates	fehlings or Benedict's test	red color is not observed no presence of reducing sugar	red or brown color is observed dueto the presence of reducing sugar ( aldehyde or ketone)
Protein	Biuret test	no change in the colour of the Biuret reagent	the blue colored Biuret reagent turned to pink shows the presence of protein
Starch	iodine test	starch doesn't change color when added with iodine solution	starch turned out bule to black colour on adding with iodine solution
Organic or inoanic	lime water test	smoked and bubbled in lime water milky white is not observed inorganic substance	smoked and bubbled in water milky white nature is observed presence of organic substance.