BioU3 assignment

List the chemical elements present in Carbohydrates: ​ (a)   ​ (b)   ​ (c)  

• carbon
• hydrogen
• oxygen
• nitrogen
• phosphorus

List the chemical elements present in lipids/fats: ​ (a)   ​ (b)   ​ (c)  

• carbon
• hydrogen
• oxygen
• nitrogen
• phosphorus

List the chemical elements present in proteins​ : ​ (a)   ​ (b)   ​ (c)   ​ (d)  

• carbon
• hydrogen
• oxygen
• phosphorus
• nitrogen

Chemical reagent to test for starch: ​ (a)  

positive result: ​ (b)  

• iodine solution
• blue-black color
• Benedict's solution
• ethanol
• biuret solution
• brick-red precipitate
• white emulsion
• purple color

Chemical reagent to test for reducing sugar: ​ (a)  

positive result: ​ (b)  

• iodine solution
• blue-black color
• Benedict's solution
• ethanol
• biuret solution
• brick-red precipitate
• white emulsion
• purple color

Chemical reagent to test for protein: ​ (a)   ​

positive result: ​ ​ (b)  

• iodine solution
• blue-black color
• ethanol
• biuret solution
• brick-red precipitate
• white emulsion
• purple color

Chemical reagent to test for lipids/fats: ​ (a)   ​

positive result: ​ ​ ​ (b)  

• iodine solution
• blue-black color
• ethanol
• biuret solution
• brick-red precipitate
• white emulsion
• purple color

Describe how you would carry out a food test on a piece of fish to find out if it contained fats.
State what result would indicate a positive test for fats.