Science Topic 2: Final Test Review

Question 1

That are the 6 MOST common elements in living organisms

Answer 1

Carbon, Nitrogen, Phosphorus, Hydrogen, Oxygen & Sulfur

Question 2

Formula for Water is _____.

Answer 2

H20

H2 stands for 2 Hydrogen Atoms and 1 Oxygen Atom.

H2 stands for 2 Hydrogen Atoms and 1 Oxygen Atom.

Question 3

What is the PH of water? Why?

Answer 3

7 because it is neutral.

7 because it is a neutral solvent & it has nothing in it.

Question 4

Inside of Water Molecules are Oxygen Atoms Positive or Negative.

Answer 4

Slightly Negative

Question 5

Rank the levels of organization from largest to smallest.

Answer 5

Biome->Ecosystem->Community->Population
->Organism->Organ Systems-> Organs->Tissues
->Cells->Molecules->Atoms

Question 6

14 is basic or acidic.

Answer 6

Basic

Question 7

6 is basic or acidic.

Answer 7

Acidic

Question 8

Water Loving is

Answer 8

Hydrophylic

Question 9

Water hating is

Answer 9

Hydrophobic

Question 10

Define a Hydrogen Bond

Answer 10

An attraction between two water molecules.

Question 11

Does Water becomes more or less dense when it freezes?

Answer 11

Less

Question 12

Cohesion is an attraction between

Answer 12

molecules of the same substance

Question 13

Adhesion is an attraction between

Answer 13

other charged materials

Question 14

Hydrogen bonding of water molecules provides cohesion which creates

Answer 14

Surface Tension

Question 15

Cohesion is important to plants because it

Answer 15

Pulls water through them

Question 16

An example of cohesion is

Answer 16

Surface Tension!

Question 17

Do Polar and Non-Polar molecules attract or repel?

Answer 17

Repel

Question 18

Polar molecules are NOT attracted to

Answer 18

any molecules that have a charge

Question 19

High Specific Heat Capacity is

Answer 19

The process of water that tends to input heat and retain it

Question 20

Water can absorb a lot of heat before its _______ changes.

Answer 20

temprature

Question 21

Evaporation increases broken water molecules and it results in

Answer 21

cooling the surface

Question 22

Are Non-Polar molecules hydrophobic or hydrophilic?

Answer 22

Hydrophobic (NO WATER)

Question 23

Are Polar molecules hydrophobic or hydrophilic?

Answer 23

Hydrophilic (WATER YES)

Question 24

Hydrogen Bonding is the attraction between 2 __________ molecules.

Answer 24

Hydrogen molecules attracted to each other is hydrogen bonding.

Question 25

Describe a micelle

Answer 25

The name of detergent molecules

Question 26

In a micelle how many hydrophobic and hydrophilic sides are there

Answer 26

1 each

Question 27

In a micelle how many polar and non-polar sides are there

Answer 27

1 each

Question 28

An example of a buffer is

Answer 28

a weak base or a weak acid

Question 29

Buffers are used to

Answer 29

neutralize the ph of a base or acid

Question 30

What property of water allows water to stick to each other and cause capilary action.

Answer 30

Adhesion

Question 31

Does water have equal hydroxide and hydrogen molecules?

Answer 31

Yes

Question 32

In a mixture of the pH of 5.4, does it have more hydroxide molecules or hydrogen molecules?

Answer 32

Hydrogen atoms due to it being under 7.

Question 33

Define a Mixture

Answer 33

2 substances easily mixed together that can be separated, marbles and water.

Question 34

What is a homogenous mixture?

Answer 34

A mixture that is spread EVENLY

Question 35

What is a heterogeneous mixture?

Answer 35

A mixture that is spread UNEVENLY

Question 36

List 2 examples of a heterogeneous mixture

Answer 36

Milk & Orange Juice

Question 37

List 2 examples of a homogenous mixture

Answer 37

Saltwater & Coffee

Question 38

Define a Solution

Answer 38

2 substances easily dissolve and can’t be seperated

Question 39

What is the difference between a Solute and a Solvent?

Answer 39

The solute is being dissolved, a solvent is the thing that is doing the dissolving.

Question 40

Define a Solute

Answer 40

The thing being dissolved inside of a solvent.

Question 41

Define a Solvent

Answer 41

The thing that helps dissolve the solute.