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Chemistry Chapter 3
Matter, Properities, Elements, Mixtures, etc.
Terms | Definition |
---|---|
matter | mass that occupies space |
physical properties | color, odro, volume, melting point, boiling point, density |
chemical properties | ability to form new substances after changes ex. wood burning giving off heat and gases and leaving behind residues of ashes, rustin |
element | substance that cannot be broken down into other substances by chemical methods |
compound | substance composed of a given combination of elements that can be broken down into thos eelements by chemical methods |
mixture | something that has a variable composition |
pure substance | always has the same composition |
2 ways to separate mixtures | distillation and filtration |
homogenous mixture | substances that cannot be separated physically |
heterogenous mixture | substances that cna be easily separated physically |
energy | the capacity to do work |
how does temperature affect motion of molecules? | as temp increases, so does motion |
calorie | amount of energy (heat) required to raise the temp. of one gram of water by one degree celcius |
1 cal=??J | 4.18 J |
Specific heat/energy formula | Q= m x sh x tc |
specific heat | amount of energy required to change the temp of ne gram of substances by 1 degree Celcius |
Mass=? units | grams |
specific heat=? units | j/g degress c |
temperature change | degrees Celcius |
energy/heat | Joules or calories |