Chap 2 - chemistry Flashcards
Electrical Energy
Energy that results from the movement of charged particles
Chemical Energy
Energy that is stored in bonds of chemical substances.
Mechanical Energy
Energy that is directly involved in moving matter.
Radiant energy
Energy that travels in waves
Element
A unique substance that constitutes the building blocks of matter and thy cannot be broken down I to simpler substances by ordinary chemical methods.
How does Calcium (Ca) function in the body?
Found as a salt in bones and teeth
How does Potassium (K) function in the body?
The major intracellular cation.
Essential for the conduction of nerve impulses and for muscle contraction.
How does Sodium (Na) function in the body?
The major extracellular cation.
Important for water balance, conduction of nerve impulses, and muscle contraction
How does Iodine (I) function in the body?
Needed to make functional thyroid hormones
How does Iron (Fe) function in the body?
A component of the hemoglobin molecule that is necessary for oxygen transport in red blood cells.
Atomic mass number
Number of neutrons + protons of an atom.
This number is indicated on the periodic table below the symbol for each element.
Atomic Number
Number of protons (electrons) in an atom.
Isotope
have the same number of protons and electrons, but differ in the number if neutrons they contain.
Same atomic number but different atomic masses
Radioisotopes
Heavier isotopes decompose to become more stable. This process of spontaneous atomic decay is radioactivity.
Radioactive decay involved the ejection of particles or energy from the atoms nucleus and are damaging to living cells.
Why are radioisotopes used in medicine?
Used in minute amounts to tag biological molecules so they can be followed through the body for medical diagnosis and treatment.