Quiz #7: Making Soap e Saponification Reaction 1. An amphipathic molecule refers

Question

Quiz #7: Making Soap e Saponification Reaction 1. An amphipathic molecule refers to a molecule which is a. negatively charged on one end and positively charged on the other end. b. polar on one end and nonpolar on the other end. c, water-insoluble. d. polar on both ends and nonpolar in the middle 2. TRUE OR FALSE: Fats (solid at room temperature) contain double bonds in all or most of its hydrocarbon chains. 3. When oil on your hands is surrounded by soap molecules and water, it forms a structure called a. a bubble. b. soap scum. c. a detergent. d. a micelle. 4. "Soap scum" is formed when a. the divalent cations in the water react with the soap, causing a precipitate. b. the soap kills the bacteria on your hands, causing a precipitate. c. the water softeners bind to the divalent cations in the water, causing a precipitate. d. the sodium ions in the water react with the soap, causing a precipitate.

Explanation / Answer

1)

choose B, like fats, they will have two sides, an hydrophobic and hydrophilic heads

2)

False, normal fats that are solid at room T are SATURATED fats, like butter and bacon; they do not have doubl ebonds

3)

a micelle

4)

soap scum is essentially the precipitation of Ca+2 and Mg+, in this case the "divalent" ions inwater, choose A

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