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Chemistry Test 2
Chem
| Question | Answer |
|---|---|
| a unit formed from other units | Derived units |
| density derived unit is | g/mL |
| Base unit for volume is | Liters |
| Mega | 1,000,000 |
| Kilo | 1,000 |
| Centi | 0.01 or 1/10 |
| Milli | 0.001 or 1/1000 |
| Micro | 0.000001 or 1/1000000 |
| How many times you are close to the 'true' | accuracy |
| hitting it in the same spot doesn't have to be the target | precision |
| used to express the magnitude of difference between values | Percent error |
| means the measured value is less than the actual value | Negative % error |
| water density | 1.0/mL g/mL |
| a measurement include the known digits plus one estimated digit | Sig Figs |
| have an unlimited number of sig figs, obtained when you count objects, from a defined relationship. NOT OBTAINED WITH MEASURING TOOLS | exact numbers |
| cannot be more precise than the measuring tool, so a ________ must match the least precise measurement | calculated answer |
| state the same measurement in two different units, fractions in which the numerator and the denominator are equal quantities expressed in different units | Conversion factors |
| Density of water? | 1g/mL |
| General Problem- solving strategy | - starting point - end point - devise way to get from start to end using what is given and what you know - use solution map to diagram the steps required to get from start to end |
| when a measurement is recorded properly, all of the digits that are read directly (certain) and one estimated (uncertain) digit are called | Sig figs |
| Mega | M 1000000g = 1 Mg |
| Kilo | k 1,000 g = 1 kg |
| Base Units | g, L, m |
| Centi | c 1g = 100 cm |
| milli | m 1 g = 1000 mg |
| nano | n 1g = 1000,000,000 ng |
| pico | p 1 g = 1000000000000 pg |
| Prefix + base unit | Full name |
| a standard, agreed on quantity by which other quantities are measured | A unit |
| a number that is usually between 1 and 10 | decimal part |
| 10 raised to an exponent,n | exponential part |
| The non–place-holding digits in a measurement | Significant Figures |
| When a number is expressed in scientific notation | all trailing zeros are significant. |
| have an unlimited number of significant figures | Exact numbers |
| the result carries the same number of significant figures as the factor with the fewest significant figures. | multiplication or division |
| the result has the same number of decimal places as the quantity with the fewest decimal places. | addition and sub |
| With all mult, div, sub, add | we do the steps in parentheses first; determine the correct number of significant figures in the intermediate answer, and then complete the remaining steps. |
| Length | m |
| Mass | g |
| Volume | l |
| Density= | mass/ volume |
| % of error = | measured value- actual value/actual value x 100 |
Created by:
astei
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