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vocab of science 4th
Question | Answer |
---|---|
Law of conversation of mass | Nothing is ever created or destroyed |
Physical change | when matter is altered but the substance does not change |
chemical change | when the substence does change |
Element | any substence that can not be broken down into a simpler one by a chemical reaction |
Chemical formula | a representation of a substence using symbols |
Element molecule | a molecule that only has one type of element |
compound molecule | a molecule with several types of elements |
chemical equation | a symbolic representation of when chemicals come in contact |
chemical reaction | process that changes the molecular composition of a substance |
reactants | substance that reacts with another |
product | the result of two reactants |
coefficient | numerical constant mesuring the property of a substence |
subscript | number printed below the symbols of the element |