Term | Definition |
matter | anything that has mass |
substance | a single kind of matter that is pure |
physical property | a characteristic of a pure substance |
chemical property | a characteristic of a pure substance , that can be broken down |
element | a pure substance that cannot be broken down |
atom | is the basic particle from which elements are made |
chemical bond | is the force of attraction from which elements are made |
molucules | groups of two or more atoms held together by chemical bond |
compound | a pure substance of two or more substances |
chemical formula | it shows the elements in the compound and the ratio of atoms |
mixture | is made of two or more substance , element , compounds or both |
hetrogenious mixture | you can see the different parts |
homogenous mixture | are so evenly mixed that you can’t see the different parts |
solution | an example of homogenous mixture |
physical change | any change that alters the form or appearance of matter but does not make any new substances |
chemical change | a change in matter that produces one or more new substances |
law of conversations | the fact that matter is not created or destroyed in any chemical or physical change |
energy | is the ability to do work or cause change |
tempature | is a measure of average energy of random motion of particles |
thermal energy | is the total energy of particle in an object |
endothermic change | a change in which energy is taken |
exothermic change | releases energy |