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8th GRADE SCIENCE
Chap 2 Vocabulary Quiz 2
Question | Answer |
---|---|
mass | the quantity of matter in an object or substance |
weight | the gravitational attraction for an object's mass |
volume | the space an object occupies |
ion | atoms with more or fewer electrons than protons |
force | a push or a pull |
gravity | it gives objects weight |
work | a force that acts on an object as it moves through a distance |
energy | the ability to do work |
1st law of thermodynamics | energy cannot be created or destroyed, but can only change from one form to another |
atom | the smallest building block of matter |
element | a pure substance made of one kind of atom |
molecule | distinct particles formed by the combination to 2 or more atoms |
physical change | when matter changes in a way that alters the appearance but not it's composition |
chemical change | when a pure substance changes into another substance |
nuclear change | when an atom emits protons or neutrons |
compound | formed with the combination of 2 or more elements |