Science Topic 2: Final Test Review Flashcards
Study this 5 times before testing, it helps with key concepts.
That are the 6 MOST common elements in living organisms
Carbon, Nitrogen, Phosphorus, Hydrogen, Oxygen & Sulfur
Formula for Water is _____.
H20
H2 stands for 2 Hydrogen Atoms and 1 Oxygen Atom.
H2 stands for 2 Hydrogen Atoms and 1 Oxygen Atom.
What is the PH of water? Why?
7 because it is neutral.
7 because it is a neutral solvent & it has nothing in it.
Inside of Water Molecules are Oxygen Atoms Positive or Negative.
Slightly Negative
Rank the levels of organization from largest to smallest.
Biome->Ecosystem->Community->Population
->Organism->Organ Systems-> Organs->Tissues
->Cells->Molecules->Atoms
14 is basic or acidic.
Basic
6 is basic or acidic.
Acidic
Water Loving is
Hydrophylic
Water hating is
Hydrophobic
Define a Hydrogen Bond
An attraction between two water molecules.
Does Water becomes more or less dense when it freezes?
Less
Cohesion is an attraction between
molecules of the same substance
Adhesion is an attraction between
other charged materials
Hydrogen bonding of water molecules provides cohesion which creates
Surface Tension
Cohesion is important to plants because it
Pulls water through them
An example of cohesion is
Surface Tension!
Do Polar and Non-Polar molecules attract or repel?
Repel
Polar molecules are NOT attracted to
any molecules that have a charge
High Specific Heat Capacity is
The process of water that tends to input heat and retain it
Water can absorb a lot of heat before its _______ changes.
temprature
Evaporation increases broken water molecules and it results in
cooling the surface
Are Non-Polar molecules hydrophobic or hydrophilic?
Hydrophobic (NO WATER)
Are Polar molecules hydrophobic or hydrophilic?
Hydrophilic (WATER YES)
Hydrogen Bonding is the attraction between 2 __________ molecules.
Hydrogen molecules attracted to each other is hydrogen bonding.
Describe a micelle
The name of detergent molecules
In a micelle how many hydrophobic and hydrophilic sides are there
1 each
In a micelle how many polar and non-polar sides are there
1 each
An example of a buffer is
a weak base or a weak acid
Buffers are used to
neutralize the ph of a base or acid
What property of water allows water to stick to each other and cause capilary action.
Adhesion
Does water have equal hydroxide and hydrogen molecules?
Yes
In a mixture of the pH of 5.4, does it have more hydroxide molecules or hydrogen molecules?
Hydrogen atoms due to it being under 7.
Define a Mixture
2 substances easily mixed together that can be separated, marbles and water.
What is a homogenous mixture?
A mixture that is spread EVENLY
What is a heterogeneous mixture?
A mixture that is spread UNEVENLY
List 2 examples of a heterogeneous mixture
Milk & Orange Juice
List 2 examples of a homogenous mixture
Saltwater & Coffee
Define a Solution
2 substances easily dissolve and can’t be seperated
What is the difference between a Solute and a Solvent?
The solute is being dissolved, a solvent is the thing that is doing the dissolving.
Define a Solute
The thing being dissolved inside of a solvent.
Define a Solvent
The thing that helps dissolve the solute.
In a micelle is the head hydrophobic or hydrophilic?
Hydrophilic
In a micelle is the tail hydrophobic or hydrophilic?
Hydrophobic
