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| 1 |
Which of the following is NOT part of Daton's Atomic Theory?
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All elements are composed of atoms |
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Atoms of the same element are identical and atoms of different elemetns are different |
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Atoms are in constant motion |
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Chemical reactions occur when atoms are rearranged. |
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| 2 |
How many protons, electrons and neutron are there in an atom of silver (Ag)? |
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47 protons, 61 electrons, and 61 neutrons |
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61 protons, 61 electrons, and 47 neutrons |
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61 protons, 41 electrons, 47 neutrons |
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47 protons, 47 electrons, 47 neutrons |
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47 protons, 47 electrons, and 61 neutrons |
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| 3 |
What is the primary contribution made by J.J. Thomson toward
our understanding of the atom? |
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He discovered electricity |
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He discovered the electron |
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He discovered the proton |
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He discovered the nucleus of the atom |
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| 4 |
Thomson proposed what model of the atom? |
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The Plum Pudding Model |
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The Planetary Model |
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The Quantized Model |
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The String Model |
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| 5 |
What was the significance of the Gold Foil Experiment performed by Rutherford? |
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It showed that gold atoms are radioactive |
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It showed that Gold foil can be used to freeze trout in and thus protect the flavor. |
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It showed that the electron is negatively charged |
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It showed that neutrons and protons are of about equal mass |
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It showed that the atom is mostly empty space and that the nucleus is very small, dense and located in the center of the atom and that the electron orbits the nucleus like the planets orbit the sun. |
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| 6 |
What was the significance of the Millikan Oil Drop experiment? |
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It showed that oil droplets could respond to electric current |
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It showed the actual charge on the electron. |
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It showed the density of oil droplets |
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It showed that protons were oppositely charged than electrons |
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It showed that electrons gave off energy |
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| 7 |
What are isotopes? |
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Isotopes are atoms of the same element that have a differing number of electrons |
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Isotopes are atoms of the same element that have a differing number of neutrons. |
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Isotopes are atoms of the same element that have a differing number of protons |
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Isotopes are the same compound with a different arrangement of elements |
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Isotopes are found on a weather map |
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| 8 |
This is defined as exactly one-twelfth the mass of a carbon-12 atom. |
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an atomic gram |
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a carbon electron |
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An atomic mass unit |
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The nucleus of a carbon atom |
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| 9 |
Element X has two natural isotopes. The isotope with mass 10.012 amu has a relative abundance of 19.91%. The isotope with mass 11.009 has a relavtive abundance of 80.09%. Calculate the average atomic mass for this element. |
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10.810 |
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11.005 |
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10.008 |
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9.610 |
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21.000 |
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| 10 |
The law of conservation of mass states that matter can neither be created nor destroyed. Use Dalton's atomic theory to explain this law. |
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Since all matter is composed of atoms, matter is always present |
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Dalton stated that all collisions atoms are perfectly elastic so no matter can be created or destroyed |
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One of Dalton's postulates is that in a chemical reaction atoms are rearranged not created or destroyed. |
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Since all atoms are alike, they can't be created or destroyed. |
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In a chemical reaction, protons are traded between atoms thus matter is conserved |
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