3 Which of the following will completely dissolve in water M

3. Which of the following will completely dissolve in water? (More than one answer may be correct)

1. A large polar molecule

2. An ionically bonded salt

3. A small polar molecule

4. A small non-polar molecule

5. A large non-polar molecule

Solution

3. Which of the following will completely dissolve in water?

1. A large polar molecule - will completely dissolve in water (some under Heat conditions ) So True

Lets take starch as Example for large polar molecule.Starch becomes soluble in water when heated through a process is called starch gelatinization.  

2. An ionically bonded salt - will completely dissolve in water So True

Lets take Nacl as Example

3. A small polar molecule - will completely dissolve in water So True

Ex: Glucose or Urea

4. A small non-polar molecule - No - Due to the presence of hydrophobic groups these are not soluble in water

5. A large non-polar molecule- No - Due to the presence of hydrophobic groups these are not soluble in water. But at the same time they have hydrophilic groups too. So they dissolve partially.