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Bio190 > Week 2 - Chemisty Part 2 > Flashcards

Week 2 - Chemisty Part 2 Flashcards

1
Q

Electronegativity

A

Tendency to attract a bonding pair of electrons

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2
Q

More electronegativity in one atom =

A

greater pull of another atom towards it

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3
Q

electronegativity = polarity

A

molecules have atoms with different levels of

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4
Q

Weak interactions: polarity

A

when the electron are pulled to one side of the molecule preferentially

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5
Q

Weak interactions: small weak charge

A

(not a true molecular charge) that happens within the molecule

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6
Q

When molecules are completely balanced / neutral, often symmetrical

A

They have no polarity = NO POLAR MOLECULES

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7
Q

What is Hydrogen bonding

A

when the hydrogen on one molecule weakly attracts to an electronegative atom on another polar molecule
(it’s like 2 separate families that like to hang out)

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8
Q

what atoms will hydrogen attract to on?

A
  • other polar molecule
  • oxygen
  • nitrogen
  • sulfur
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9
Q

what are the unique properties of water?

A
  • liquid and gas at room temp
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10
Q

When water molecules stick together quite effectively

A

high surface tension

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11
Q

True or false, liquid water is able to change temperatuure quickly

A

FALSE

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12
Q

Vaporization requires a ____ of _____

A

lot, heat

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13
Q

T/F - Frozen wter is less dnese than liquid water, why

A

true, it expands and floats

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14
Q

water is a great _____ for _____ molecules

A

solvent, polar

- if its polar then water will accept it

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15
Q

What are the properties of water

A
  • Cohesion
  • Adhesion
  • Capillary action
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16
Q

water cohesion

A

attraction of molecules to other molecules to the same type

17
Q

water adhesion

A

attraction of molecules to other molecules of a different kind

18
Q

capillary action in water

A

water pulls up a glass (capillary) tube quite easily - water is attracted to the glass walls

19
Q

What are chemical reactions?

A

They are the making and breaking of chemical bonds

20
Q

What are the starting molecules of a chemical reactions called, left or right side?

A

reactants

21
Q

The final molecules of a chemical reaction are called, left or ride side?

A

products

22
Q

An ‘arrow’ represents what in a chemical reaction

A

yield

23
Q

coefficients represent how many _____ are in each reaction

A

molecules

24
Q

subscripts represent how many _____ are in each molecule

A

atoms

25
Q

What is the pH scale

A

A scale of 0-14 - measures how many protons (H+) are in a solution

26
Q

pH greater than 7.0

A

Acid

27
Q

pH less than 7.0

A

Basic

28
Q

pH of 7.0

A

Neutral

Bio190 (3 decks)

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