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AP biology testing

biology

QuestionAnswer
atoms consist of 3 subatomic particles: protons neutrons electrons
what is ground level? if all electrons in an atom are in it's lowest energy level
what is excited state? when an atom absorbs energy, its electrons move to a higher energy level
what is an isotope? atoms of one element that vary only in the number of neutrons in the nucleus
what is half-life? half life enables us to measure the age of fossils or to estimate the age of the earth
what are radioisotopes? A version of a chemical element that has an unstable nucleus and emits radiation during its decay to a stable form
what is tracer? A radioactive molecule that can be sent through the body's circulatory or urinary system, with its progress followed by a radiation-sensitive machine.
bonds form when: two atomic nuclei attract the same electrons
two main types of bonds: ionic covalent
ionic bonds result from: the transfer of elecrtons
what is an anion a negative ion
an atom that gains electrons become: an anion
what is a cation? a positive ion
an atom that looses electrons become: a cation
covalent bonds form when atoms: share electrons
covalent bonds form when atoms share electrons. what structure results from this? a molecule
when electrons are shared equally between two identical atoms the bond is: nonpolar
when electrons are shared unequally the bond is referred to as: polar
hydrophilic means: water loving
hydrophobic means: water hating
since so many substances dissolve in water, water is known as the: universal solvent
hydrophobic applies to non polar substances, which are: miscible with or will dissolve with lipids
Water is a very (blank) molecule polar
two molecules are held together by hydrogen bonding
water has 4 important things high specific heat, high heat of vaporization, is the universal solvent, exhibits strong cohesion tension
ice floats because it's (blank) dense than water less
what is pH a measure of the acidity and the alkalinity of a solution
Created by: beachkiki