USABO – UNIT 1 – CHAPTER 2 CHEMICAL
CONTEXT OF LIFE
Element: ANSWER Something that can't be broken down by chemical
processes into simpler things
A compound is a material created by combining two or more elements
chemically in a certain ratio.
Twenty to twenty-five percent of the 92 natural components are necessary
elements—ANSWER elements that an organism requires to survive and
procreate.
trace elements—ANSWER—that a creature needs in extremely small amounts
goiter-ANSWER: The thyroid gland enlarges abnormally due to a diet low in
iodine.
The smallest unit of substance with elemental qualities is the atom.
The standard unit for determining the mass of atoms and their subatomic
particles is dalton/amu.
The total number of protons and neutrons in an atom's nucleus is its mass
number.
The weighted average of an element's isotope masses is its atomic mass.
Isotopes: A ANSWER Atoms of the same element with varying neutron counts
ANSWER: radioactive isotope An unstable isotope is an atomic form of a
chemical element in which the nucleus decays spontaneously, releasing energy
and observable particles.
CONTEXT OF LIFE
Element: ANSWER Something that can't be broken down by chemical
processes into simpler things
A compound is a material created by combining two or more elements
chemically in a certain ratio.
Twenty to twenty-five percent of the 92 natural components are necessary
elements—ANSWER elements that an organism requires to survive and
procreate.
trace elements—ANSWER—that a creature needs in extremely small amounts
goiter-ANSWER: The thyroid gland enlarges abnormally due to a diet low in
iodine.
The smallest unit of substance with elemental qualities is the atom.
The standard unit for determining the mass of atoms and their subatomic
particles is dalton/amu.
The total number of protons and neutrons in an atom's nucleus is its mass
number.
The weighted average of an element's isotope masses is its atomic mass.
Isotopes: A ANSWER Atoms of the same element with varying neutron counts
ANSWER: radioactive isotope An unstable isotope is an atomic form of a
chemical element in which the nucleus decays spontaneously, releasing energy
and observable particles.
