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Chem 209
| Question | Answer |
|---|---|
| ______ is a science that deals with materials and the changes of these materials. | chemistry |
| A _____ made with any instrument requires an estimate. | measurement |
| A _____ always has some degree of uncertainty. | measurement |
| A measurement always consists of two parts: _____ & _____. | a number & a unit |
| How many significant figures are in the number 6,407,000? | 4 |
| ^15N and^15O are_____ | isotopes |
| _____ can undergo chanWe often formulate general obseved behavior into a statement called a _____. | natural law |
| _____ can undergo changes in both its physical and its chemical properties. | matter |
| two cubes of the same size but different masses will have different _____ | densities |
| A _____ ______ is used to convert the moles of starting substances to the moles of desired substance. | mole ratio |
| any number can be expressed as a number between _____ and _____ and a power of 10 ( either positive or negative) . | 1 and 10 |
| _____ has mass and occupies space. | matter |
| _____ reaction will always have water and carbon dioxide as products | combustion |
| Mass Percent (%) | [ mass of solute (part) divided by mass of solution (whole) ] x 100 |
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