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Biology > Chapter 2 : pH and water > Flashcards

Chapter 2 : pH and water Flashcards

1
Q

Polar molecules ____ in water

A

dissolve

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2
Q

What can water dissolve ?

A

Polar and charged molecules

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3
Q

Solution definition

A

Two substances mixed together

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4
Q

Solute definition

A

Substance to be dissolved (sugar)

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5
Q

Solvent definition

A

The one doing the dissolving (water)

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6
Q

In salt water , Salt is the ____?

A

Solute
( smaller amount)

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7
Q

Cohesion definition

A

Similar things attract together
(water molecules cling together)

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8
Q

Cohesion with water does what?

A

Gives water capacity to resist breaking under tension

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9
Q

Why is Cohesion important?

A

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

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10
Q

Acid definition

A

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

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11
Q

Base definition

A

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

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12
Q

Inverse definition

A

Higher the pH the lower the concentration of H+

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13
Q

Logarithmic definition

A

Increase in pH represents 10x decrease in H+ concentration

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14
Q

Ph scale :
Below 7 is what ?

A

Acidic

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15
Q

Ph scale :
At 7 is what ?

A

Neutral

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16
Q

Ph scale :
Above 7 is what ?

A

Basic

17
Q

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

False or True ?

A

False

18
Q

Is a pH of 8 acidic or basic ?

A

Basic
(slightly basic to be exact)

19
Q

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

A

100x Lower

20
Q

Biological Fluids definition

A

Have buffers to keep pH stable

21
Q

Buffer definition

A

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

22
Q

Why do body fluids have buffers?

A

To maintain stable internal enviornment

23
Q

Draw a water molecule and draw hydrogen bonding between water molecules

A

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

24
Q

What are the four properties of water?

A

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

25
Q

What is important about water having an excellent polar solvent?

A

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

26
Q

What is important about water having cohesion?

A

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

27
Q

What is important about water having high heat capacity?

A

Water in our bodies helps keep us at a constant temperature

28
Q

What is important about water having high heat of vaporization?

A

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

29
Q

What is the pH scale?
What are the scales ?

A

The higher the pH , the lower the concentration of H+

Each point increase in pH represents a 10 fold decrease in H+ concentration

30
Q

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

A

B

31
Q

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

A

High heat capacity

32
Q

In salt water, which is considered the solute?

A

Salt

33
Q

Substances that donate hydrogen ions when in solution are?

A

Acids

34
Q

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

A

10x lower

35
Q

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

A

Acidic

36
Q

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

A

Buffers

Biology (22 decks)

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