Download 2nd Six Weeks Vocabulary Unit 4: Chemical Formulas, Equations

2nd Six Weeks Vocabulary
Unit 4: Chemical Formulas, Equations, and Reactions (Matter and Energy)
Chemical Formula - A way to show the number and type of atoms in a compound or a molecule with symbols and
numbers.
Coefficient- A number in front of any chemical formula in a chemical equation showing the number of molecules
involved in the reaction.
Subscript- A small number that is written below the normal line of letters to show the number of atoms of each element
is present in a substance.
Chemical reaction- A change in which a substance (or substances) is changed into one or more new substances with
different properties than the original substances
Chemical equation- Describes what happens in a chemical reaction. The equation identifies the starting materials
(reactants) and resulting substances (product) in formula form.
Reactant- Formulas written on the left side of the yield ( → ) are the starting substances in a chemical reaction.
Product- Formulas written on the right side of the yield ( → ) are the new substances formed in a chemical reaction.
Molecule- Two or more atoms joined together. The atoms can be the same element or different elements.
Compound- A substance composed of two or more DIFFERENT element.
Law of Conservation of Mass – states that mass cannot be created or destroyed
Unit 5: Force & Motion, Unbalanced Forces (Force, Motion and Energy)
Force- a push or a pull
Unbalanced Force- unequal forces that result in movement
Net Force- total forces acting on an object in a direction
Newton- unit of measurement for force
Weight- measurement of the pull of gravity on an object; weight is considered a force.
Inertia- Tendency of an object to stay at rest or stay in motion at a constant speed and direction until an outside force
acts upon it
Acceleration- Change in velocity
Speed- Distance traveled over time
Average Speed- Total distance traveled over the total time used
Constant Speed- Speed that remains the same over a certain amount of time
Velocity- an objects speed in a certain direction