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# Chemistry 1 ljw

### Chapter 1

chemical change also known as chemical reaction; substances are used up (disappear and others are formed to take their places
matter anything that has mass and takes up space
chemistry the science that deals with matter; the structure and properties of matter and the transformation from one form of matter to another
physical changes substances that do not change. The changes only take place in their state
chemical properties chemical reactions that a substance undergoes
physical properties properties that do not involve chemical reactions
scientific method a tool scientists use to test theories
fact a statement based on direct experience
hypothesis a statement that is proposed without actual proof, to explain the facts and their relationship
theory the formulation of an apparent relationship among certain observed phenomena, which has been verified to some extent
serendipity chance observation
exponential notation based on the powers of 10
significant figures number that needed to make a reasonable conclusion
metric system a system of measurement that originated in France
International System of Units (SI) is based on the metric system and uses some of the metric units
meter (m) base unit of length
volume space
liter (L) base unit of volume
mass the quantity of matter in an object
gram (g) base unit of mass
weight the force a mass experiences under the pull of gravity
second (s) the base unit of timme
Celsius base unit of temperature
Kelvin (K) absolute scale
absolute value 0K
factor-label method follows the rule that when multiplying numbers, we also multiply units and when dividing numbers, we also divide units
gasses has no definite shape or volume
liquids have no definite shape, but they do have a definite volume that remains the same when they are poured from one container to another
solids have definite shapes and volumes. They are compressible
destiny mass per unit volume
specific gravity numerically the same as density, but it has no units
enery the capacity to do work
kinetic energy (KE) the enerrgy of motion
potential energy stored energy
law of conservation of energy the statement that energy can be neither created or destroyed
heat the form of heat that most frequently accompanies chemical reactions
calorie the amount of heat necessary to raise the temperature of 1g of liquid water by 1 degree c
joule (J) the official SI unit for heat
specific heat (SH) the amount of heat necessary to raise the temperature of 1g of any substance by 1 degree C
Created by: 1507509781

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