Chapter Two Flashcards
Matter
Anything that occupies space and has weight/mass.
Matter can exist as what?
solid
Liquid
Gas
What is an element?
The simplest form of matter that cannot be divided into smaller substances by natural means.
Oxygen
O
Carbon
C
Hydrogen
H
Nitrogen
N
What are the major elements?
Oxygen
Carbon
Hydrogen
Nitrogen
What are the minor elements
Calcium Phosphorous Potassium Sulfer Sodium Chlorine Magnesium
Calcium
Ca
Phosphorous
P
Potassium
K
Sulfer
S
Sodium
Na
Chlorine
Cl
Magnesium
Mg
Trace elements
Iron
Copper
Zinc
Iodine
Iron
Fe
Copper
Cu
Zinc
Zn
Iodine
I
What is a atom?
The smallest unit of an element that retains the unique properties of that element.
What are the subatomic particles?
Protons (+)
Neutrons
Electrons (-)
Protons and neutrons are found where?
Nucleus
Protons and neutrons determine what?
Atomic weight
The atomic weight of an atom tells us how many of what?
Protons
If an atom loses or gains an electron it becomes what?
Ion
If an atom has a different number of neutrons ate called what?
Isotope
First shell can contain how many electrons?
Two electrons
Second shell can contain how many electrons?
Eight electrons
What is a molecule?
Form when two or more atoms are joined together by chemical bonds
What is a molecule of the element?
Two or more atoms of the same element are joined together
What is a compound?
Two or more atoms from different elements are joined together.
What is bonding?
How atoms are attached to one another.
What is a covalent bond?
Bonds formed when atoms share electrons.
What is a ionic bond?
Formed when electrons are transferred from one atom to another.
How do atoms stick together?
Electrostatic attraction
What are cations?
Ions with a net positive charge
What are anions?
Ions with a negative charge
What are the different types of chemical bonds?
Covalent
Ionic
Hydrogen
What is a synthesis reaction?
New and more complex molecule is made from multiple, simpler chemicals. More complicated
What is a decomposition reaction?
Single complex chemical is broken down into multiple, simpler chemicals. Less complicated
What is a exchange reaction?
Certain atoms are exchanged between molecules. Combination of synthesis and decomposition reaction.
What are the types of chemical reactions?
Synthesis
Decomposition
Exchange
What are the factors that influence reaction rates?
Concentration
Temperature
Activation energy
What is a catalyst?
Special proteins that hold reactants together so they can interact.
What is a inorganic molecule?
Do not contain hydrocarbon groups and often have ionic bonding.
What are organic molecules?
Contain hydrocarbon groups and are usually covalently bonded.
What is a hydrophilic?
Chemicals dissolve well or mix with water
What is a hydrophobic?
Chemicals do not mix well with waters.
What is a electrolyte?
Substances that have ability to transmit an electrical charge.
Acids
Substances that when added to water freely release hydrogen ions
Bases
Substances that when added to water release a hydroxyl ion
Lower numbers on a pH scale are what?
Acidic
Higher numbers on a pH scale are what?
Basic
What is the pH of neutral?
7
What is the pH of blood?
7.4
What do buffers do?
Help cells maintain a neutral pH
What four groups are in organic molecules?
Carbohydrates
Lipids
Proteins
Nucleic acid
Simple sugars are what?
Monosaccharides
Hexose has how many carbon atoms?
6
A pentose has how many carbon atoms?
5
What is a dehydration synthesis?
Removal of water during a reaction
What is a hydrolysis?
Is the breaking down of complex molecules into simpler ones by adding water.
What is a glycoprotain?
When a molecule is formed out of a carbohydrate attached to a protein.
What are the 4 classes of lipids?
Neutral fats
Phospholipids
Steroids
Eicosinoids
What are saturated fatty acids?
All bonds in the hydrocarbon chain are single bonds
What are unsaturated fatty bonds?
When there are some double bonds between the carbon and hydrogen atoms
What is a lipoprotein?
Marcromolecule composed of proteins and lipids
What is a basic ring structure that forms different steroids?
Cholesterol
What are the building blocks of protein?
Amino acids
What does a amino acid do?
Makes each protein unique and defines the proteins function
What is a primary structure?
Sequence and number of amino acids that link together to form the peptide chain
What is a secondary structure?
The natural bend of parts of the peptide chain as it is formed in three dimensions
What is a tertiary structure?
Overall shape of a single protein molecule
What is a quaternary structure?
When two or more tertiary structures join to form a complex macromolecule
What are structural proteins for?
For adding strength to tissues or cells