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1st Semester Vocab.
| Term | Definition |
|---|---|
| safety goggles | goggles used to protect the eyes when working with chemicals, fire or when the teacher says to |
| waft | using your hand to move a scent towards yourself |
| graduated cylinder | a container used to measure liquids |
| mass | amount of matter in an object |
| triple balance scale | a way to measure an objects mass |
| density | mass of an object divided by volume |
| volume | amount of space an object can contain |
| chemical change | when a substance is changed chemically, giving it new properties |
| physical change | when the physical properties of a substance are changed |
| nucleus | the center of an atom |
| proton | a part of the nucleus that is positively charged |
| neutron | a part of the nucleus that is neutrally charged |
| electron | a negatively charged part of an atom |
| periodic table | the collection of all known elements |
| atomic number | the number above the element on the periodic table (same as number of protons) |
| chemical equation | chemical symbols used to represent a reaction |
| reactants | the original substances before a chemical reaction |
| products | the product of a chemical reaction |
| balanced force | a force that has no motion |
| unbalanced force | a force that causees an object to be in motion |
| Newton's first law | An object at rest will stay at rest, and an object in motion will stay in motion until acted on by an unbalanced force |
| Newton's second law | The acceleration of an object depends on the mass of the object and the amount of force applied to the object |
| Newton's third law | For every action, there is an equal and opposite reaction |
| speed | speeed is calculated by dividing distance by time |
| time | time is calculated by dividing distance by speed |
| distance | distance is calculated by multiplying speed by time |
| speed graphs | speed graphs can have no motion, move forward or backward, have an increase in speed or have a decrease in speed |
| acceleration graphs | an acceleration graph can have no motion, a constant speed, positive acceleration or a negative acceleration. |
| galaxies | system of millions or billions of star, with gas and dust, which are held together by gravity |
| spiral galaxies | galaxies where stars followed with gas and dust form a spiral shape |
| elliptical galaxies | galaxies shaped like ellipses(stretched circles), categorized from E0-E7 |
| irregular galaxies | galaxies with no definite form or shape |
| absolute magnitude | how bright a star actually is |
| apparent magnitude | how bright a star looks |
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W0504153
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