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Physical Science: Semester Exam Vocab

Across
The total number of electrons found in the outermost energy level of a Bohr model
Type of matter made from atoms of more than one element that are chemically combined (CO2, NaCl)
Statement based on your interpretation of the facts
Educated guess about a proposed explanation (If... then... because...)
Uses your five senses to gather information
Number on the periodic table that is equal to the number of protons in an element
Type of matter that contains atoms that are all alike. Cannot be separated into anything simpler (O2, Fe, Ne)
Type of mixture that is unevenly mixed and individual components can be seen
A process that requires thermal energy to be added or absorbed (energy *enters*)
Type of ion that has *gained* electrons and become *negatively* charged
Phase change from liquid to gas
Subatomic particle with a negative charge
Properties of a substance that can be observed without changing the identity of the substance (color, shape, mass)
Phase change from solid to gas
Number on the periodic table that is equal to the protons plus the neutrons in an element
State of matter in which particles are closely packed and vibrate in place
Statement of a process that happens in nature (*What* happens)
Center of the atom that contains the protons and neutrons
Phase change from liquid to solid
Down
The variable that remains the same
Properties of a substance that describe how it will react with others to create an entirely new substance (flammability, reactivity)
The variable that a scientist measures
Subatomic particle with no charge
A process that requires thermal energy to be removed or released (energy *exits*)
Atoms of the same element that have a different number of neutrons
Phase change from gas to liquid
The variable that a scientist changes
Phase change from gas to solid
Type of mixture that is uniform and evenly mixed throughout
Type of matter made from two or more substances that are not chemically combined (air, salt water)
Detailed explanation of *why* something happens in nature
Atoms of the same element that have a different number of electrons (these have an electric charge)
State of matter in which particles are loosely packed and can slide past each other
State of matter in which particles have so much energy they have lost their electrons and become charged
Type of ion that has *lost* electrons and become *positively* charged
Subatomic particle with a positive charge
State of matter in which particles are very spaced out and move in all directions