Bio Medical Bio Social Issues Exam 1
Terms
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- All matter is comprised of what?
- matter
- What is matter?
- anything having mass and occupying space
- What is Mass?
- a measure of the amount of matter that an object contains
- Mass Weight
- the measure of how strongly and object is pulled by earths gravity and consequently varies as a function of distance from the earths center. Mass does not vary with its position.
- Biologically Important Elements
-
92 naturally occuring elements
25 are essential for life - 96% of all living matter
- C,O,H and N
- remaining 4% of all living matter
- Ca, P, K, S, Na, Cl, Mg, and trace elements
- Trace Elements
- Although in very small quantities are very important
- Compounds
- two or more compounds combined in a fixed ratio
- Atom
- smallest possible unit of matter that retains the physical and chemical properties of its element, all atoms of the same element share the same chemical properties.
- What does the atomic structure determine?
- the behavior of an element
- Atams are comprised of subatomic properties, what are they?
- Neutrons, protons, and elctrons
- Nucleus
- dense core of the atom
- What is the nucleus's charge?
- it is positively charged-neutrons and protons are positivly charged only
- Electrons
- ...are held in orbits by the electrostatic attraction to nuclear protons
- Dalton
- unit of mass equal to 1.67 x 10-24 g
- Atomic number
- equal to the number of protons in a particular element
- What is the same of all atoms of a particular element?
- the atomic number
- In a neutral atom, the number of electrons equals the number of what?
- protons
- Mass Number
- the number of protons and neutrons in a particular element
- Nomenclature
- 23 Na (sodium has a total of 23 neutrons and protons
- Knowing both the atomic number and mass number you can determine the number of what?
- neutrons (23-11=12)
- Mass number is an approximate measure of what?
- the mass of an atom since proton and neuton mass are approximatly 1 dalton
- Atomic Weight
- the weighed mean of the masses of an element's constituent isotopes
- Isotope
- the of an element that have the same atomic number but different mass number
- Isotopes must have...
- the same number of protons and different number of neutrons
- Energy
- the ability to do work
- potential energy
- energy stored by matter due to its position or location
- Energy levels of electrons
-
electrons are negetively charged particles that orbit around the nucleus
-equal in mass and size
-involved in chemical reaction
-have potential energy - electron shells
- fixed potential energy states