Bio 1201 Exam 1 Gregg Questions and Answers 2024

Matter consists of chemical elements in pure form and in combinations called ______________. - Compounds ______________ consists of chemical elements in pure form and in combinations called compounds. - Matter Matter consists of ________________ in pure form and in combinations called compounds. - Chemical elements Organisms are composed of _____________. - Matter _______________ is anything that takes up space and has mass. - Matter Matter is anything that takes up __________ and has _______. - Space; mass Matter is made up of ____________. - Elements An _________________ is a substance that cannot be broken down other substances by chemical reactions - Element A ___________________ is a substance consisting of two or more elements in a fixed ratio. - Compound T/F: A compound has characteristics different from those of its elements - True An element's properties depend on the structure of its ______. - Atom An ____________ is the smallest unit of matter that still retains the properties of an element. - Atom Atoms can be broken down into smaller particles like ___________ (no charge), ______________ have a positive charge, and _____________ (negative). - Neutrons, protons, and electrons No electrical charge - Neutron Postive charge - Proton Negative charge - Electron _____________ and ___________ form from the atomic nucleus. - Neutrons and protons What do neutrons and protons form from? - Atomic nucleus ________________ form a "cloud" of negative charge around the nucleus. - Electrons Electrons form a "_______" of negative charge around the nucleus. - Cloud Neutron mass and proton mass are almost identical and are measured in __________. - Daltons ____________ mass and _________ mass are almost identical and are measured in daltons. - Neutron and proton Atoms of the various elements differ in number of ________________. - Subatomic particles An element's atomic number is the number of ___________ in its nucleus. - Protons An element's _________________ is the number of protons in its nucleus. - Atomic number An element's ___________ is the sum of protons plus neutrons in the nucleus. - Mass number An element's mass number is the sum of _________ plus _________ in the nucleus. - Protons; neutrons _______________, the atom's total mass, can be approximated by the mass number. - Atomic mass All atoms of an element have the same number of __________ but may differ in number of _____________. - Protons; neutrons ______________ are two atoms of an element that differ in number of neutrons. - Isotopes _______________________ decay spontaneously, giving off particles and energy. - Radioactive isotopes The electrons of an atom differ in their amounts of _______________. - Potential energy An electron state of potential energy is called its energy level, or _____________. - Electron shell