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RSM Chp. Two
| Term | Definition |
|---|---|
| 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 makeup or composition and a specific set of properties. |
| physical property | is a characteristic of a pure substance that be observed without changing it into another substance |
| chemical property | is a characteristic of a pure substance that describes its ability to change into different substances |
| element | is a pure substance that cannot be broken down into any other substances by chemical or physical means |
| atom | is the basic particle from which all elements are made |
| chemical bond | when atoms combine the force of attraction between two atoms |
| molecule | when atoms combine to form larger particles of two more atoms held together by chemical bonds. |
| compound | is a pure substance made of two or more elements chemically combined in a set ration |
| chemical formula | representation of a compound showing the elements and their ratio |
| mixture | is made of two or more substance that are together in the same place but NOT chemically combined. |
| heterogeneous mixture | you can see the different parts or substances |
| homogeneous mixture | substances are evenly mixed that you cannot see the different parts |
| solution | is a homogeneous mixture and does not have to be a liquid. It can be a gas (AIR) or solid (brass) |
| physical change | is any change that alters the form or appearance or matter but does not make any substance in the matter into a difference substance |
| chemical change | a change in matter that produces one or more new substances, sometimes called chemical reaction |
| law of conservation of matter | that matter is not created or destroyed in any chemical or physical change sometimes called the Law of Conservation of Mass |
| energy temperature | is the ability to do work or cause change. Every chemical and physical change in matter includes a change in energy |
| thermal energy | is the total energy of all of the particles in an object. |
| endothermic change | change in which energy is taken in |
| exothermic change | change in which energy is given off or released |
| chemical energy | the energy stored in the chemical bonds between atoms is a form of energy. |
| electromagnetic energy | a form of energy that travels through space as waves |
| electrical energy | is the energy of electrically charged particles moving from one place to another |
| electrode | used in electrolysis are the two metal strips are placed in a solution not touching one another for an electric current to flow through solution. |
| temperature | is measure of average energy of random motion of particles of matter |
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