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Biology quizzy

QuestionAnswer
What is a hypothesis? testable statement
What is an experiment? a statistical analysis or close observation
What are the eight characteristics of living things? energy, irritable, homeostasis, dna produces functional chemicals, dna allows reproduction, 1 or more cells, evolved from other living things, highly organized
What is the smallest unit of matter that cannot be broken down by chemical means? Atom
What is found in every atoms nucleus, has a positive electrical charge and a weight of 1 unit? Proton
What has no electrical charge and has a weight of one unit? neutron
what orbits around the nucleus, has a negative charge and a weight of zero? electron
What is defined by the number of protons in the nucleus? Elements
What is the atomic number? The number of protons
What is the Atomic Weight? Protons plus the neutrons
What defines an Isotope? When the protons and neutrons are not equal. Most isotopes are radioactive.
1 proton 0 neutron hydrogen
1 proton 1 neutron deuterium
1 proton 2 neutrons tritium
What is an ion? when the protons and electrons are not equal.
an atom which gains an electron is a negative ion
an atom which loses an electron is a positive ion
What is chemical bonding it allows atoms to share or exchange electrons to achieve stability
what is a molecule 2 or more atoms are chemically bonded each other
covalent shared electrons (strongest)
ionic exchanged electrons
hydrogen partially charged poles of one molecule are attracted to negatively charged poles of a second molecule. (weakest chemical bond)
Created by: porshabeth
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