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Chem-PostMidterm
Midterm Review
| Term | Definition |
|---|---|
| Variable | Only one of these will change between testing groups in a strong experiment |
| Control | The test group that represents the most typical conditions, with no variables introduced. |
| Constants | These are variables that will not change between test groups in a strong experimental design |
| Estimated | When taking volume in a graduated cylinder the value is measured to the nearest line then one digit is taken beyond and called this. |
| Two | The number of significant zeroes in 0.00004020 m. |
| Negative | In 0.0000862 the sign of the exponent in scientific notation will be (positive/negative?) |
| accurate | If the average value of three trials is within 5% of the accepted value, then the results are considered _____________. |
| Three | The number of significant figures in the product of 12.5 g + 3.46 g. |
| mass | In order to calculate density, one must divide ________ by volume. |
| Total | To calculate number of half-lives, divide _________ halflife time by length of one half-life. |
| Final | Volume of an irregular object is obtained by subtracting beginning volume from _______ volume. |
| thousand | There are a _______________ mL in one L |
| hundred | There are a _______________ cm in one m |
| thousand | There are a _______________ m in one km. |
| heat | In a Specific Heat Calculation, Q is obtained in Joules. This is a measure of Energy or _______. |
| starting | Q = m * C * Delta T; The Delta T is equal to ending temperature minus ____________ temperature. |
| Compound | The chemical combination of two or more different elements. |
| Mixture | The physical combination of two or more different substances. |
| Homogeneous | A solution in which the mixed substances cannot be visually distinguished. |
| Distillation | Evaporation is a form of ___________________ in which a solid precipitate is left behind. |
| Straight | Because atoms are made up of mostly empty space, the Alpha particles of Rutherford's experiment mostly went _________ through the gold foil. |
| Equal | The law of conservation of matter means that the sum of reactants will _________ the sum of products in a chemical reaction. |
| Chemical | A precipitate is an example of a _______________ change. |
| Physical | Salt dissolved in water is an example of a _________________ change. |
| ElectronCloud | The atomic model of the Quantum Mechanical Theory is called the _______ ________ model. |
| Mass | The nucleus of an atom is positively charged, very dense, and contains most of the __________ of an atom. |
| Proton | The mass of a neutron most closely equals the mass of a/an ____________. |
| Electrons | In a neutral atom the number of protons equals the number of __________. |
| Protons | In order to be Isotopes, E-20 and E-21 must have the same number of _________. |
| Electrons | In Thomson's model the ________________ are like 'raisins' stuck in positively-charge atomic 'dough.' |
| Bohr | In the ___________ atomic model, electrons orbit the nucleus in definite paths. |
| Protons | The atomic number of an atom equals the number ______________ |
| Neutrons | An atom's mass number is equal to its protons plus ____________. |
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