Across
- 3. refers to how close a measured value is to an accepted value
- 7. a physical property, such as mass, length, and volume, that is dependent upon the amount of substance present
- 8. a characteristic of matter that can be observed or measured without changing the sample’s compisition-for example, density, color, taste, hardness, and melting point
- 11. the number of all known digits reported in measurements plus one estimated digit
- 12. a defined unit in a system of measurement that is based on an object or event in the physical world and is independent of other units
- 13. a transition of matter from one state to another
- 15. refers to how close a series of measurement are to one another; precise measurements show little variation over a series of trials but might not be accurate
Down
- 1. the amount of mass per unit volume; a physical property
- 2. a systematic approach to problem solving that uses conversion factors to move from one unit to another
- 4. the ablility or inablilty of a substance to combine with or change into one or more new substances
- 5. a process involving one or more substances changing into new substances; also called a chemical reaction
- 6. a type of change that alters the physical properties of a substance but does not change its composition
- 9. a physical property that remains the same no matter how much of a substance is present
- 10. gaseous state of a substance that is a liquid or a solid at room temperature
- 14. a ratio of equivalent used to express the same quantity in different units; is always equal to 1 and changes the units of a quantity without changing its value