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Biology Quiz 1

Lab #1, Structure & Function of Microscope, Ch. 2

Protons Positive (+)
Electrons Negative (-)
Neutrons Neutral
Subatomic particles Protons, electrons, neutrons
As electrons go further from the nucleus what happens Energy increases
When is energy absorbed The further away from the nucleus you go
When is energy lost The closer to the nucleus you go
Atomic number # of protons
Atomic mass # of protons + neutrons
Atom a single particle
Element made up of one or many of the same atoms
Compound (always a molecule) 2 or more different atoms combined
Molecule (not always a compound) 2 or more of the same atoms combined
Isotopes atoms of the same element (same # of protons) but different atomic mass (varies in # of neutrons)
Valence e- # of e- needed to fulfill outermost shell
What are the elements that make up most the bodies elemental value? O (65%), C (18.5), H (9.5%), and N (3.3%)
Are atoms with a full outermost shell reactive? no
What is specific heat the energy needed to change the temperature by 1 degree
Hydrogen bond a weak attraction between a (-) end of one molecule and a (+) end of another molecule
Buffer prevents extreme changes in the pH by providing H ions when needed for removing them when needed
Hydrophilic dissolves in water (salt)
Hydrophobic no affinity with water (oil)
Acids gives H ions (H+ > OH-)
Bases take H ions (H+ < OH-)
natural pH 7 (H+ = OH-)
H+ concentration calculation 10^-1 = pH of 1, 10^-2 = pH of 2, 10^-7 = pH of 7 etc.
As concentration goes down, pH does what goes up
What is the chemical behavior of an atom determined by the distribution of electrons in shells, but specifically the valance shell
covalent bond sharing of pair of valence e- by 2 atoms
are covalent bonds strong or weak strong
name weak bonds covalent bonds, hydrogen bonds, and Van der Waals
cohesion water molecules stay close together like water going from the ground to a tree's leaves
adhesion clinging of one substance to another
what happens when heat is absorbed hydrogen bonds break
what happens when heat is released hydrogen bonds form
1 mm equal how many um 1,000
working distance distance between specimen and object
field of view area user can see through ocular lenses
depth of field thickness of specimen that may be seen in focus at one time
total magnification power of ocular lenses*power of objective lense
formula for estimating size of specimen size of field of view/approximate number of specimen across diameter
ocular lenses allows you to see specimen
revolving nose piece holds the objectives
head supports ocular lenses
objectives scanning (4x), intermediate (10x), high-power (40x)
arm supports stage and condenser lens
mechanical stage supports specimen being viewed
phase contrast turret houses the condenser which is used to focus light
coarse focus adjusts distance between stage and objective (big movement)
fine focus adjusts distance between stage and objective (small movement)
stage adjustment knobs moves stage forward, backwards, left, and right
lamp provides light
base acts as stand for the microscope and houses the lamp
light intensity lever adjusts the intensity of the light
power button on/off
condenser used to focus light from the lamp through the specimen to be viewed
iris diaphragm controls the width of the circle of light therefore controlling amount of light that passes though the specimen
condenser adjustment knob adjusts height of condenser
Created by: studystack_0325



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