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CH. 3 Sig Fig Intro
Significant Figures
| Question | Answer |
|---|---|
| getting close to the expected value | accurate |
| the closeness of a series of values to each other | precise |
| non-zeros (NZ), trapped, trailing with decimal (TWD) | always significant figures |
| leading , trailing without decimal (TWOD) | never significant figures |
| 90009. All of the numbers between the 9's | trapped |
| number written as the product of a number [1 x <10 ] 10 x 10 raised to a power | scientific notation |
| 1 , 2, 3, 4, 5, 6, 7, 8, 9 are this type of number | non-zeros |
| 6.0000 all the numbers after the 6 | trailing zeros with decimal |
| 400 all the numbers after the 4 | trailing zeros without a decimal |
| 0.00002 all of the numbers before the 2 | leading zeros |
| 5 or more (rounding rule) | round up |
| 4 or less (rounding rule) | stay the same |
| these exponents make the original number smaller | negative exponents |
| these exponents make the original number larger | positive exponents |
| a count or math conversion | infinite significant figures |
| rounding rule for adding and subtracting | least number of decimal places |
| rounding rule for multiplying and dividing | least number of significant figures |
| order of operations | P--> E--> D--> M--> A--> S |
| study of calculated quantities of reactants and products in a chemical reaction | stoichiometry |
| SI unit for amount of substance | mole |
| 6.02 x 10^23 representative particles | Avogadro's Number |
| STP conditions | 273 degrees Kelvin & 1 atm of pressure |
| 1 mole of any gas at STP has this volume | 22.4 L |
| the mass listed on the periodic table that is a weighed average of all known isotopes | atomic mass |
| the mass of 1 mole of any element or compound (g/mol) | molar mass |
| this indicates the number of moles of an element or compound in a chemical equation | coefficient |
| substance added to cause a chemical reaction or test for the presence of specific substances | reagent |
| reagent that is completely used up in a chemical reaction | limiting reagent |
| reagent that will have "leftovers" after a chemical reaction is complete | excess reagent |
| measure of how inaccurate a measurement or value is compared to the actual value | percent error |
| STP stands for this in chemistry | Standard Temperature and Pressure |
| chemical equation that has the same number of atoms for each element on both sides | balanced equation |
| chemical equation with unequal numbers of atoms for each element on both sides | skeleton equation |
| states that mass is not created or destroyed in a chemical reaction | law of conservation of mass |
| the ratio of each element in a compound | percent composition |
| the ratio of amount of product formed compared to the theoretical yield | percent yield |
Created by:
cadetjt
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