The flashcards below were created by user
NoUserName
on FreezingBlue Flashcards.
-
What is a Covalent Bond?
The sharing of a pair of valence e- by two atoms!
-
Two or more atoms held together by covalent bonds constitute a ___?_____.
Molecule!
-
Electronegativity?
Attraction of a particular atom for the e- of a covalent bond
-
The more electro-negative an atom is, the more _____ it pulls ______electrons toward itself
strongly! shared!!
-
What is an element?
a substance that cannot be broken down to other substances by chemical reactions
-
What is a compound?
Consists of two or more different elements combined in a fixed ratio
-
Atom?
smallest unit of matter that still retains the props of an element
-
mass number?
sum of protons and neutrons
-
-
isotope?
same element different # of neutrons
-
What is an ion?
a Charged atom or molecule
-
positively charged ions have more +p or -e?
Protons
-
What are the most abundant elements occurring in our body?
O, C, H and N
-
4 elements that make most of our body mass?
also give percentage.
- -Oxygen 65.0%
- -Carbon 18.5%
- -Hydrogen 9.5%
- -Nitrogen 3.3%
-
Other elements that make up our body mass (~3.7%) ?
-
What does oxygen do for our bodies?
- -Found in water
- -Found in blood and lungs due to respiration
-
Some things that does carbon does for our bodies?
- -found in organic molecules in our body
- -Typically ingested in food that is eaten
-
Hydrogen in our body?
Hydrogen is found in all water molecules in the body as well as many other compounds making up the various tissues
-
Nitrogen in our bodies..?
-Very common in proteins and organic compounds.
-
Some things Ca does for humans?
Calcium is a primary component of the skeletal system, including the teeth. It is also found in the nervous system, muscles, and the blood.
-
Some things P does for us humans
This element is common in the bones and teeth, as well as nucleic acids.
-
Some things K does for our body?
Potassium is found in the muscles, nerves, and certain tissues
-
Some things Na does for our bodies?
Sodium is excreted in sweat, but is also found in muscles and nerves
-
Some things Cl does for our body?
Chlorine is present in the skin and facilitates water absorption by the cells.
-
Some things Mg does for our body?
Magnesium serves as a cofactor for various enzymes in the body.
-
Some things S does in our body?
Sulfur is present in many amino acids and proteins.
-
Some things Iron does for our body?
Iron is found mostly in the blood since it facilitates the transportation of oxygen.
-
Some things Iodine does in our body?
Iodine is found in certain hormones in the thyroid gland.
-
What are radioactive isotopes?
Isotope in which the nucleus decays spontaneously, giving off particles and energy.
Changes atom to an atom of a different element.
-
What is an electron shell?
Where electrons can be found
-
Atoms with completed valence shell are said to be unreactive or _________.
inert
-
The 3 dimensional space where an e- is found 90% of the time is called?
An orbital
-
How many electrons can fill and orbital?
2
-
What are the two most strongest kinds of chemical bonds?
covalent and ionic bonds
|
|