Unit 1 Vocab Crossword

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Across
  1. 2. Only count toward significant figures if the number contains a decimal point
  2. 3. an estimate of how much a measured or calculated value differs from a true value
  3. 5. A change that occurs when one or more substances change into entirely new substances with different properties.
  4. 6. a measure of how close a series of measurements are to one another
  5. 9. used to describe a natural phenomenon which has been tested over a long period of time under different conditions.
  6. 12. a hypothesis that is supported by experimental data. Contributes toward a scientific theory.
  7. 14. A measure of the force of gravity on an object's mass
  8. 15. matter formed when elements chemically combine to form new matter.
  9. 17. Tests each hypothesis to accept or reject them.
  10. 18. an organized approach to solve problems
  11. 19. the amount of matter in an object
  12. 21. Matter is not created nor destroyed in any chemical or physical change
  13. 23. reasonable explanation for what was observed
  14. 24. The study of the properties of matter and how matter changes
  15. 27. anything that can do work or produce heat
  16. 28. a measurement that gives descriptive, non-numeric results
  17. 31. Numbers that have no uncertainty and thus do not limit the number of significant figures in any calculation.
  18. 32. Never count as significant figures
  19. 33. using 5 sense to define a problem
  20. 34. A characteristic of a pure substance that can be observed without changing it into another substance
  21. 35. matter with a uniform and definite composition
  22. 36. a measurement that gives definite, usually numeric results and a unit.
Down
  1. 1. A change in a substance that does not involve a change in the identity of the substance
  2. 4. Theory a well-tested explanation for a set of observations or experimental results
  3. 7. A method of writing or displaying numbers in terms of a decimal number between 1 and 10 multiplied by a power of 10.
  4. 8. Anything that has mass and takes up space
  5. 10. two or more pure substances physically combined
  6. 11. All the digits that can be known precisely in a measurement, plus a last estimated digit based on the instrument being used to measure.
  7. 13. zeroes between nonzero digits are ALWAYS significant
  8. 16. A mixture in which substances are evenly distributed throughout the mixture
  9. 20. compares the results of an experiment to accept or reject the hypotheses.
  10. 22. how close a measurement is to the true value
  11. 25. A mixture that is not uniform in composition; components are not evenly distributed throughout the mixture
  12. 26. Characteristics of a substance that determine how it will react with other substances.
  13. 29. a quantity that has both a number and a unit
  14. 30. matter found on the front of the periodic table