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Biology > Water & pH > Flashcards

Water & pH Flashcards

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AP® Biology flashcards Biology 101 flashcards
1
Q

Polar molecule

A

A molecule in which the charges are unevenly distributed

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2
Q

Hydrogen Bond

A

Attraction between hydrogen atom and another atom; not as strong as covalent or ionic bonds

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3
Q

Solution

A

Type of mixture in which all components are evenly distributed (homogeneous)

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4
Q

Mixture

A

Two or more elements or compounds that are physically mixed together but not chemically combined.

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5
Q

Solute

A

Part of a solution that is dissolved

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6
Q

Solvent

A

Part of a solution that does the dissolving

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7
Q

pH

A

Measure of the concentration of hydrogen ions in a solution

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8
Q

Base

A

Any compound that forms OH- ions in a solution; more OH- ions, the stronger the base.

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9
Q

Adhesive

A

Molecules are attracted to molecules of different substances by hydrogen bonds

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10
Q

Cohesive

A

Molecules are attracted to other molecules of the same substance by hydrogen bonds

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11
Q

Suspension

A

MIxture of water and undissolved materials

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12
Q

Acid

A

Any compounds that forms H+ ions in a solution; more H+ ions, the stronger the acid

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13
Q

Capillary Action

A

When water rises in a narrow tube against the force of gravity as a result of adhesion

(One of the forces that draws water out of the roots of a plant and up into its stem and leaves!)

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14
Q

Buffer

A

Mixtures (usually weak acids or bases) that can react with acids or bases to keep the pH within a particular range.

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15
Q

Hydroxide ion

A

A negatively charged molecule made of one hydrogen atom to one oxygen atom

OH-

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16
Q

Hydrogen ion

A

The nucleus of a hydrogen atom seperated from it’s accompanying electron

H+

17
Q

Cohesion

A

Water molecules attract each other.

18
Q

Adhesion

A

Water molecules attract other molecules

19
Q

Ionic bond

A

Electrical attraction between two oppositely charged atoms or groups of atoms

20
Q

Compound

A

Pure substance with unique properties; formed when two or more different elements combine

21
Q

Surface tension

A

A force which causes a layer of liquid to behave like an elastic sheet or skin

Cohesion causes surface tension

22
Q

Covalent bond

A

Type of chemical bond formed when atoms share electrons

23
Q

Why does ice float in water?

A

Ice is less dense than water.

Biology (10 decks)

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