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questions based on chemistry

what makes a substance pure a substance is pure if it is made of only type of atom or molecule.
what is an element elements are one type of atom.
what is a compound compounds are two or more elements together.
what is mass a measurement of how much matter is in an object.
what is weight weight is the measure of the force of gravity on an object.
what is the difference between mass and weight mass does not change. weight changes if the force of gravity changes.
what is the international system of units units that all scientist use. SI
What is volume. how much space matter takes up
density how much mass is in an object D= M/v
What is a physical change A change in matter that does not change the substances make up.
chemical change a change to matter that makes a new substance. This does change the substance's makes up
temperature a measure of the average energy in an object.
thermal energy. measures the total amount of energy.
endothermic change takes in energy
exothermic change releases energy
Created by: batman100