Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

biology > Water > Flashcards

Water Flashcards

You may prefer our related Brainscape-certified flashcards:
AP® Biology flashcards Biology 101 flashcards
1
Q

What % of a cell content is water ?

A

80%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Why is water important?

A 
Metabolite.
Solvent.
Helps with temp control.
High latent heat of vaporisation.
High specific heat capacity.
Very cohesive.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Why is water a metabolite?

A

It’s important metabolic reactions.

Condensation/ hydrolysis.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Why is water a solvent?

A

Substances dissolve in it and most metabolic reactors occur in solution.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

How does water help with water temperature?

A

High latent heat of vaporisation.

High specific heat capacity.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Water molecules are very cohesive, why is this good?

A

Helps water transport in plants.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is the structure of water?

A

One atom of oxygen.
Joined to 2 atoms of hydrogen.
By shared electrons.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Where is the shared negative hydrogen electron pulled towards?

A

Oxygen atom.

Meaning other side of each hydrogen atom is left with slight positive charge.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What charge do the unshared electrons have on oxygen molecule ?

A

Slight negative charge

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

So why is water a polar molecule ?

A

Partial negative charge on one side and partial positive charge on the other.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Are the hydrogen bonds strong or weak ?

A

Weak

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Where are the hydrogen bonds found?

A

Between slightly positively charged hydrogen atom in one molecule and slightly negatively charged atom in another molecule.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Give example of metabolic reactions?

A

Condensation and hydrolysis reaction .

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Why does a hydrolysis reaction need water ?

A

To break a bond.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Why does a condensation reaction need water?

A

It releases one as a new bond is formed.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Give example of condensation reaction.

A

Amino acids join together to make polypeptides

17
Q

Give example of hydrolysis reaction.

A

Energy from ATP released is through hydrolysis reaction.

18
Q

What does it mean if a substance is ionic?

A

Made from one positively charged atom and one negatively charged atom.

19
Q

Give an example of an ionic molecule ?

A

Salt
Positive sodium ion
Negative chloride ion

20
Q

How will the ions get surrounded by water ?

A

As the slightly positive charged end of water molecule will be attracted to negative ion.
Negative ion will be attracted to positive ion.
Dissolve

21
Q

So how is a water polarity good for humans?

A

They can take up substances like mineral ions dissolved in water and they can be transported around the organisms Body.

22
Q

What is a metabolic reaction?

A

Chemical reaction happening inside a living organism.

Metabolite is substance involved in the reaction.

23
Q

When will water evaporate?

A

When the hydrogen bonds holding water molecules together are broken.
Allows water molecules on surface to escape into air as gas.

24
Q

Why is it difficult for water to evaporate?

A

As it takes a lot of energy to break hydrogen bonds between water molecules.
High latent heat of vaporisation .

25
Q

What does it mean when it says a high latent heat of vaporisation ?

A

Lots of heat used to change for liquid to a gas.

26
Q

Why is vaporisation useful for organisms?

A

Water loss through evaporation to cool down without losing too much water.
When water evaporates it carries away heat energy from surface which cools surface down and helps lower temp.

27
Q

What part of the water molecule gives water a high specific heat capacity?

A

Hydrogen bonds m.

28
Q

Define specific heat capacity l?

A

Energy needed to raise temp of 1 gram of substance by 1 degrees.

29
Q

So what happens when the water is heated?

A

A lot of the heat energy used to break hydrogen bonds between water molecules.
Less water available to heat the water up.

30
Q

How does water have a high specific heat capacity?

A

Takes a lot of energy to heat up

31
Q

What does cohesion mean ?

A

Attractive between water molecules of the same type.

32
Q

Why are water molecules cohesive?

A

Due to polarity.

33
Q

Why is strong cohesion in water good ?

A

Helps water flow so good for transportation.
Also has high surface tension when it come in-contact with air.
This is why sweat forms droplets and evaporates to cool skin down.

34
Q

Example of cohesion system .

A

Water travels in column up xylem.

biology (40 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions