Chapter 2 : pH and water

Question 1

Polar molecules ____ in water

Answer 1

dissolve

Question 2

What can water dissolve ?

Answer 2

Polar and charged molecules

Question 3

Solution definition

Answer 3

Two substances mixed together

Question 4

Solute definition

Answer 4

Substance to be dissolved (sugar)

Question 5

Solvent definition

Answer 5

The one doing the dissolving (water)

Question 6

In salt water , Salt is the ____?

Answer 6

Solute
( smaller amount)

Question 7

Cohesion definition

Answer 7

Similar things attract together
(water molecules cling together)

Question 8

Cohesion with water does what?

Answer 8

Gives water capacity to resist breaking under tension

Question 9

Why is Cohesion important?

Answer 9

Cohesion in water allows blood to move easier in blood vessels
(also moves water in plants)

Question 10

Acid definition

Answer 10

Substance that donates hydrogen ions when in solution
(gives up H+)

Question 11

Base definition

Answer 11

Substance that accepts hydrogen ions when in solution
(accepts H+)

Question 12

Inverse definition

Answer 12

Higher the pH the lower the concentration of H+

Question 13

Logarithmic definition

Answer 13

Increase in pH represents 10x decrease in H+ concentration

Question 14

Ph scale :
Below 7 is what ?

Answer 14

Acidic

Question 15

Ph scale :
At 7 is what ?

Answer 15

Neutral

Question 16

Ph scale :
Above 7 is what ?

Answer 16

Basic

Question 17

The higher the pH a solution has , the higher the H+ concentration?

False or True ?

Answer 17

False

Question 18

Is a pH of 8 acidic or basic ?

Answer 18

Basic
(slightly basic to be exact)

Question 19

The H+ concentration of a solution with a pH of 4 is ____ higher/lower than a solution of 2

Answer 19

100x Lower

Question 20

Biological Fluids definition

Answer 20

Have buffers to keep pH stable

Question 21

Buffer definition

Answer 21

Prevent change in pH
Remove extra H+ from solutions when the concentration of H+ increase
Add H+ when the concentration of H+ decreases

Question 22

Why do body fluids have buffers?

Answer 22

To maintain stable internal enviornment

Question 23

Draw a water molecule and draw hydrogen bonding between water molecules

Answer 23

https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.usgs.gov%2Fmedia%2Fimages%2Fstrong-polar-bond-between-water-molecules-creates-water-cohesion&psig=AOvVaw2uPGBIu9eP1IRvtSHbao6R&ust=1674884983708000&source=images&cd=vfe&ved=0CBAQjhxqFwoTCKjN6viG5_wCFQAAAAAdAAAAABAE

Question 24

What are the four properties of water?

Answer 24

Have excellent polar solvent
Have cohesion
Have high heat capacity
Have high heat of vaporization

Question 25

What is important about water having an excellent polar solvent?

Answer 25

Water is polar and forms hydrogen bonds. Acting as a solvent for polar molecules

Question 26

What is important about water having cohesion?

Answer 26

Cohesion of water allows blood to move easier in the blood vessels

Question 27

What is important about water having high heat capacity?

Answer 27

Water in our bodies helps keep us at a constant temperature

Question 28

What is important about water having high heat of vaporization?

Answer 28

When we seat the body uses its heat to vaporize the water- cooling us off

Question 29

What is the pH scale? What are the scales ?

Answer 29

The higher the pH , the lower the concentration of H+ Each point increase in pH represents a 10 fold decrease in H+ concentration

Question 30

Which of the following picture best represents two water molecules hydrogen bonding together? C:\Users\Minelly\Downloads\h bonds.PNG A B C D

Answer 30

B

Question 31

Which property of water is responsible for living organisms staying at an even temperature due to the fact that it takes a great deal of energy to raise the temperature of water? Water is an excellent polar solvent High heat capacity High heat of vaporization Water is cohesive

Answer 31

High heat capacity

Question 32

In salt water, which is considered the solute?

Answer 32

Salt

Question 33

Substances that donate hydrogen ions when in solution are?

Answer 33

Acids

Question 34

The H+ concentration of a solution with a pH of 8 is ____ higher/lower than a solution of 7. 100 X higher 1 X higher 10 X lower 1 X lower 10 X higher 100 X lower

Answer 34

10x lower

Question 35

A solution with a pH of 4 would be considered acidic or basic?

Answer 35

Acidic

Question 36

A ________ is a substance that prevents solutions from changing the pH by either accepting or releasing hydrogen ions. solutes acids bases buffers isomers

Answer 36

Buffers