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science chapter 1 section 1 and 3 chapter 2 section 3

Chemistry is the study of the properties of matter and how matter changes
matter is anything that has mass and takes up space
substance is a single kind of matter that is pure, meaning it always has a specific make up
physical properties a characteristic of a pure substance that can be observed without changing it into another substance …..how matter looks,feels,smells,sounds and tastes
chemical properties a characteristic of a pure substance that describes its ability to change into different substances….tells how matter can change into new kinds of matter…example: wood catching fire and burning
element a pure substance that cannot be broken down into any other substance by chemical or physical means
atom the basic particle from which all elements are made
Chemical bond a force of attraction between two atoms
Molecule groups of two or more atoms held together by chemical bonds
compound a pure substance made of two or more elements chemically combined in a set ratio
chemical formula shows the elements in compounds and the ratio of atoms
mixture is made of two or more substances
Heterogeneous formula you can see the different parts
Homogenous mixture so evenly mixed that you can't see the different parts
solution an example mixture of a homogenous mixture
physical change is any change that alters the form or appearance of matter but does not make any substance in the matter into a different substance
chemical change a change in matter that produces one or more new substances
law of conservation of mass the fact that matter can not be made or destroyed
Energy is the ability to do work or cause change
Temperature is a measure of the average energy of random motion of particles of matter
thermal energy is the total energy of all the particles in an object
endothermic change change in which energy is taken in
exothermic change releases energy
pressure is the force of outward push divided by the area of the walls of the container Pressure = force/area
Boyle's law When the pressure of a gas at constant temputure is increased, the volume of the gas decreases. W.hen the pressure is decreased the volume increases
Charles's law when the temperature of a gas increases at a constant pressure its volume increase. When the temputure of the gas is decreased at constant pressure, its volume decreases.
Created by: rsummers