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18 Cards in this Set
- Front
- Back
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Accuracy |
The closeness of a single measurement to its true value. |
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The mass of a certain volume of liquid is 60.0g. If the density is .780 g/mL, the volume in millimeters is: |
76.9 Density=Mass*Volume |
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4.9216 +96.843 -------------- 101.7646 What is the correct number of significant figures? |
101.765 The number of decimal places that is common |
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Combination, Decomposition, Combustion a. 2C2H2 ++5O2 --> 4CO2 + 2H2O b. Li2O + H2O --> 2LiOH |
a. combustion b. combination |
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The chemical building block is considered the..? |
atom |
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The ratio of hydrogen atoms to oxygen atoms, H:O, in ammonium oxalate, (NH4)2C2O4 is |
2:1 |
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Carbon, Nitrogen, oxygen, flouride, iodine, how many are normally existing as diatomics? |
4 |
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Pure Substance |
* Are made of only one kind of matter
* Have a constant composition with distinct properties * Elements or compounds |
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Element |
a substance that can not be separated into simpler substances by chemical means. -one kind of atom ex. Cu -molecules with one atom Ex. O2 |
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Compound |
a pure substance made of 2 or more different atoms. - * can be broken down by only chemical means* E.g. NH3, H2O |
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Homogeneous |
* evenly mixed throughout.
* e.g., air, salt water, beer, vinegar |
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Heterogenous |
* Heterogenious- not evenly mixed throughout.
* e.g., sand, rock, chocolate chip cookie, compost |
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Mixture |
combinations of 2 or more substances where each substance maintains it chemical identity. |
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Physical change |
Changes in appearance but not identity. * State changes:* boiling / condensing * melting / freezing * Sublimation/Deposition * More examples: Dissolving, melting, cutting, bending, cracking, etc. |
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Chemical change |
* Changes in chemical identity.
* Possible clues: that a chemical change has taken place are heat evolution or absorption, color change, gas production and formation of a precipitate. * E.g., Combustion, Rusting, oxidation, decomposition, fermenting etc. |
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Scientific Method |
* Observations and experiments-
* data can be qualitative or quantitative. * experiments must be repeatable and reproducible * Law – a statement (description) of something that is consistently observed. * Hypothesis – a testable explanation based on known facts (educated guess). * Theory – a hypothesis that has been tested many (best explanation). |
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Metric Prefixs |
Tera: 10^12 Giga: 10^9 Mega: 10^6 kilo: 10^3 hecto: 10^2 deca: 10^1 g/m/l: 1 deci: 10^-1 centi: 10^-2 milli: 10^-3 micro: 10^-6 nano: 10^-9 pico: 10^-12 femto: 10^-15 |
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Conversion |
* 1000 mL = 1 L
* 1 L = 1.06 qt * |
