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