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1st Semester Vocab.

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
Created by: W0504153