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Biology > 2.2 Properties of Water > Flashcards

2.2 Properties of Water Flashcards

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1
Q

A molecule in which the charges (–) or (+), are unevenly spread out is said to be

A

Polar molecule

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2
Q

The pull between a
partially positive hydrogen atom on one molecule and a partially negative oxygen atom on another is known as a hydrogen bond.

A

Hydrogen Bond

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3
Q

Is the weak chemical bond

A

Hydrogen Bond

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4
Q

Water is what molecule

A

Polar

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5
Q

Molecules of the same substance

A

Cohesion

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6
Q

Molecules of different substances

A

Ahesion

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7
Q

Made up of
elements or compounds that are combined but not bonded together

A

Mixture

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8
Q

Is a mixture in which the
molecules of the mixed substances are evenly spread out

A

Solution

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9
Q

_________are made up of one or more solutes in a solvent.

A

Solutions

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10
Q

________is what is
dissolved.

A

Solute

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11
Q

________ is what does the dissolving.

A

Solvent

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12
Q

Mixtures of water and nondissolved material that do not settle
out are __________.

A

Suspensions

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13
Q

Some important fluids in living things are

A

Solutions and Suspensions

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14
Q

Chemists use a measurement system called the
_____ to show the concentration of H+ ions in solution

A

Ph Scale

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15
Q

Is any compound that releases H+ ions in
solution

A

Acid

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16
Q

A compound that releases hydroxide (OH–
) ions
in solution is called

A

Base

17
Q

An excellent example of a buffer.

A

Blood

18
Q

These solutions have pH values below 7.

A

Acidic solutions

19
Q

These solutions have pH values above 7

A

Base solutions

20
Q

Strong acids tend to have pH values that range from…

A

1 to 3

21
Q

Strong bases tend to have pH values ranging from…

A

11 to 14

22
Q

The pH in most cells in the human body must
stay between

A

6.5 to 7.5

23
Q

Keeping pH from changing is an important
part of?

A

Homeostasis

24
Q

One way to control pH is with

A

buffers

25
Q

What are buffers?

A

Are weak acids or bases that can react with strong acids and bases to stop sharp.

26
Q

Why is it important for cells to buffer
solutions against rapid changes in pH?

A

Because buffer plays an important role in keeping homeostasis.

27
Q

_______ stop sudden changes in pH.

A

Buffers

28
Q

Cells do not dissolve in blood, but they form a
_______ because they do not settle out of the
blood either.

A

Suspension

29
Q

The water molecule (H2O) is

A

neutral

30
Q

The substances
are not chemically combined.

A

mixture

31
Q

What is the greatest solvent on Earth?

A

Water

32
Q

A water molecule can react to form

A

Ions

33
Q

Pure water has a pH of

A

7

Biology (7 decks)

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