Which of the following molecules are commonly found in "carbohydrates" the class of compounds that includes sucrose and

[answerhappygod]

Which Of The Following Molecules Are Commonly Found In Carbohydrates The Class Of Compounds That Includes Sucrose And 1 (174.69 KiB) Viewed 53 times

Which of the following molecules are commonly found in "carbohydrates" the class of compounds that includes sucrose and glucose. a. Oxygen b. Carbon C. Hydrogen d. All of the above e. None of the above Question 2 - 1 point Using a bunsen burner, you heat up 2 grams of sucrose. State briefly what is observed when sucrose is heated, and what residue remained. a. Sugar melted; boiled, giving off steam; leaving a black residue of carbon. b. The sugar evaporated into carbon dioxide gas leaving behind no residue. C. The sugar bubbled into white carbon dioxide bubbles, leaving behind a white residue made of carbon. d. The sugar crystallised into black hydrogen atoms. e. None of the above Question 3 - 1 point In which solvent did the sucrose dissolve better (water or hexane)? Hexane b. Water a. Question 4-1 point What is the scientific term to indicate that a molecule can dissolve in water? a. Hydrophilic b. Hydrophobic c. Lipophilic d. Lipophobic Question 5 - 1 point The Molisch reaction depends on the dehydration of monosaccharides by H2SO4(sulphuric acid) to give a furfural or hydroxyfurfural which forms a coloured complex with a-naphthol. What do you think happens to the disaccharide (sucrose) and the polysaccharide (starch) in the presence of H2SO4 so that they also give a positive test? a. The acid hydrolyses the glycosidic bonds of polysaccharides and disaccharides to give free sugars (monosaccharides) which are able to react with a-naphthol. b. The acid allows multiple glycosidic bonds to form through a condensation reaction which complexes with a-naphthol. The H2SO4 reacts with a-naphthol to form a colour change without the addition of any sugars. d. None of the aboy C.