Question

All mutiple choice I need all 3 please

Water molecules have a polarity, which allows them to be electrically attracted to other water molecules and other polar molecules by weak chemical bonds known as

	a.	non polar covalent bonds
	b.	hydrogen bonds
	c.	polar covalent bonds
	d.	ionic bonds
	e.	none of the above Which type of bond must be broken for water to vaporize? a. ionic bonds b. polar covalent bonds c. hydrogen bonds d. both polar covalent bonds and hydrogen bonds e. aliphatic bonds Which of the following molecules is polar? C3H7OH C2H5COOH C3H7OH and C2H5COOH are both polar molecules. Neither C2H5COOH or C3H7OH is polar. C2H5COOH is polar, but C3H7OH is not polar. C3H7OH is not polar, but C3H7OH is polar.

Answer 1

1)b.hydrogen bonds

Hydrogen bonds are formed by hydrogen atom of a molecule of water with oxygen atom of another water molecules.hydrogen atoms are bonded to oxygen atoms in water molecules and so oxygen atoms contains 2 lone pairs of electrons and partially positively charged hydrogen atoms are attracted to lone pair pf electrons on oxygen of another water molecules forming hydrogen bonds.

2)c.hydrogen bonds.

Water molecules in liquid form are attracted to each other by hydrogen bond that prevents them from transforming to gaseous form by acquiring kinetic energy. If we supply heat to break these hydrogen bonds then the molecules goes into gaseous (vapor) phase.

3)C3H7OH and C2H5COOH both are polar molecules.

C3H7OH is an alcohol which has polar groups (hydroxyl group) and C2H5COOH is a carboxylic acid which also has a polar group(carboxylic group) so bith are polar but polarity of carboxylic acid is greater than that of alcohol.