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chemistry
questions based on chemistry
Question | Answer |
---|---|
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 |