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Bio Review For Exam 1 > Water And pH > Flashcards

Water And pH Flashcards

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Biology 101 flashcards
1
Q

What gives water much of its unique characteristics ?

A

Hydrogen bonds

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2
Q

What are the 4 properties of water?

A
  1. Water is an excellent polar solvent
  2. Water has cohension
  3. Water has high heat capacity
  4. Water has high heat vaporization
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3
Q

Is water polar or non polar?

A

Polar

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4
Q

What do polar molecules dissolve in?

A

Water

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5
Q

What makes water the best polar solvent?

A

Its abilityto formhydrogen bonds with other molecules

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6
Q

What is a solution?

A

Two substances that are mixed together. One of them is called the solute and the other is the solvent

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7
Q

In sugar water which substance is the solute and which is the solvent?

A

Sugar is the solute and water is the solvent

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8
Q

What is a solute?

A

The substance to be dissolved

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9
Q

What is a solvent?

A

The substance doing the dissolving

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10
Q

What is cohesion ?

A

Gives water the capacity to resist breaking under tension

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11
Q

Why is cohesion so important?

A

Allows blood to move easier in the blood vessels

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12
Q

What happens when you increase the temperature of something?

A

The molecules in it move faster, hydrogen bonds keep the water molecules in place so it takes lots of energy to break the bonds and heat the water

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13
Q

What happens to hydrogen bonds when water changes from liquid to vapor?

A

Hydrogen bonds must be broken

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14
Q

Sweat is an example of which property of water?

A

High heat of vaporization

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15
Q

What is an acid?

A

Substances that donates hydrogen ions when in a solution

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16
Q

What is a base?

A

Substances that accept hydrogen ions when in solution (sometimes we say that bases release OH- hydroxyl ions)

17
Q

Ph is described as having a _____ relationship

A

Inverse

18
Q

Anything below 7 on ph scale is _______

A

Acidic

19
Q

The higher the ph the _______ the concentration of H+

A

Lower

20
Q

True or false: The higher the ph solution has the higher the H+ concentration

A

False

21
Q

Is a ph of 8 acidic or basic?

A

Basic

22
Q 
The H+ concentration of a solution with a pH of 4 is\_\_\_\_\_\_ (higher/lower) than a solution of 2
A. 10x higher
B. 100x higher
C. 10x lower
D. 100x lower
A

D. 100x lower

23
Q

What is the job of a buffer?

A

Prevent dramatic changes in pH, remove excess H+ solutions when concentrations of H+ increase, add H+ when concentratioons of H+ decrease

24
Q

In salt water which is considered the solute?

A

Salt

25
Q

Substances that donate hydrogen ions when in a solution are:
A. Bases
B. Acids

A

Acids

Bio Review For Exam 1 (4 decks)

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