Biology 1406 - Chapter 2 Review
(latest update) questions n answers
Matter - correct answer ✔✔ Anything that has mass and takes up space
The three types of matter? - correct answer ✔✔ Liquid, Solid, and Gas
Element - correct answer ✔✔ A pure substance that cannot be broken down into simpler
substances by physical or chemical means
Essential element - correct answer ✔✔ A chemical element required for an organism to survive,
grow, and reproduce
Trace essential element - correct answer ✔✔
Required trace elements? Percentage? - correct answer ✔✔ Oxygen (65%), Carbon (18.5%),
Hydrogen (9.5%), Nitrogen (3.3%) = 96.3%
Compound - correct answer ✔✔ A substance consisting of two or more elements in a fixed ratio
(H2)
Atom - correct answer ✔✔ Smallest unit of matter that retains the properties of an element
Subatomic particles? Their charge (If any)? - correct answer ✔✔ Neutrons (0 electrical charge) -
Protons (+ electrical charge) - Electrons (- electrical charge)
, Atomic nucleus and the components that make it up? - correct answer ✔✔ The center of an
atom that contains protons and neutrons
Atomic number - correct answer ✔✔ Equals the number of protons in the nucleus (never
changes)
Mass number - correct answer ✔✔ The number of protons plus the number of neutrons in an
atom
Atomic mass - correct answer ✔✔ The average mass of all the isotopes of an element
Isotope - correct answer ✔✔ An atom with the same number of protons and different number
of neutrons from other atoms of the same element
Energy - correct answer ✔✔ Capacity to do work
Potential energy - correct answer ✔✔ Stored Energy
Electron shells - correct answer ✔✔ regions surrounding the nucleus which holds electrons
Chemical bonds - correct answer ✔✔ an attraction between two atoms resulting from the
sharing of outer-shell electrons or the presence of opposite charges
Molecules - correct answer ✔✔ two or more atoms held together by a covalent bond (H2O)
Valence electrons - correct answer ✔✔ Electrons in the outermost shell
Valence shell - correct answer ✔✔ Outermost electron shell
(latest update) questions n answers
Matter - correct answer ✔✔ Anything that has mass and takes up space
The three types of matter? - correct answer ✔✔ Liquid, Solid, and Gas
Element - correct answer ✔✔ A pure substance that cannot be broken down into simpler
substances by physical or chemical means
Essential element - correct answer ✔✔ A chemical element required for an organism to survive,
grow, and reproduce
Trace essential element - correct answer ✔✔
Required trace elements? Percentage? - correct answer ✔✔ Oxygen (65%), Carbon (18.5%),
Hydrogen (9.5%), Nitrogen (3.3%) = 96.3%
Compound - correct answer ✔✔ A substance consisting of two or more elements in a fixed ratio
(H2)
Atom - correct answer ✔✔ Smallest unit of matter that retains the properties of an element
Subatomic particles? Their charge (If any)? - correct answer ✔✔ Neutrons (0 electrical charge) -
Protons (+ electrical charge) - Electrons (- electrical charge)
, Atomic nucleus and the components that make it up? - correct answer ✔✔ The center of an
atom that contains protons and neutrons
Atomic number - correct answer ✔✔ Equals the number of protons in the nucleus (never
changes)
Mass number - correct answer ✔✔ The number of protons plus the number of neutrons in an
atom
Atomic mass - correct answer ✔✔ The average mass of all the isotopes of an element
Isotope - correct answer ✔✔ An atom with the same number of protons and different number
of neutrons from other atoms of the same element
Energy - correct answer ✔✔ Capacity to do work
Potential energy - correct answer ✔✔ Stored Energy
Electron shells - correct answer ✔✔ regions surrounding the nucleus which holds electrons
Chemical bonds - correct answer ✔✔ an attraction between two atoms resulting from the
sharing of outer-shell electrons or the presence of opposite charges
Molecules - correct answer ✔✔ two or more atoms held together by a covalent bond (H2O)
Valence electrons - correct answer ✔✔ Electrons in the outermost shell
Valence shell - correct answer ✔✔ Outermost electron shell
