Water Properties, Buffers, Acids, Bases, pH

Question 1

What is a hydrogen bond?

Answer 1

A weak bond when H covalently (shares) bonds with one atom

Question 2

Strong or weaker than covalent/ionic bonds?

Answer 2

Weaker

Question 3

What type of bond occurs between H and other ____ compounds?

Answer 3

H-bonding and POLAR

Question 4

Is H a negative dipole?

Answer 4

No, it’s a positive (+)

Question 5

Is water a non-polar or polar molecule?

Answer 5

A POLAR

Question 6

Special properties of H20?

Answer 6

1. Temp regulator
   Takes a lot of energy to increase temp of water and it loses energy slowly. It keeps our body temp constant —> sweating to release heat energy

Question 7

Special properties of H20 (.2)

Answer 7

Acts as a solvent. H20 dissolves other substances in it

Question 8

Special properties of H20 (.3)

Answer 8

Acts as a lubricant in mouth, joints, lungs, etc.

Question 9

Special properties of H20 (.4/5)

Answer 9

Water has a high surface tension (insects walking on lake) and the molecules are cohesive and adhesive. They cling together because of hydrogen bonding

Question 10

What is water ionizing?

Answer 10

When it breaks apart into ions

Question 11

When water ionizes, what does it release?

Answer 11

An equal amount of H+ ions and OH- ions

Question 12

When acids dissolve in water, what so they release?

Answer 12

H+ ions

Question 13

When bases dissolve in water, what do they release?

Answer 13

OH- ions

Question 14

What is a pH of 1-6?

Answer 14

Very acidic

Question 15

What is a pH of 8-14?

Answer 15

Very basic

Question 16

More H+?

Answer 16

More acidic

Question 17

More OH-?

Answer 17

More basic

Question 18

What is a buffer?

Answer 18

A chemical that keeps pH within its normal limits by taking excess H+ ions to keep the levels constant.

Question 19

What is the stomach pH?

Answer 19

2.5 - 3.0

Question 20

What is blood pH?

Answer 20

7.4 or get sick