Chemistry Ch. 11
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What did Democritus, Dalton, Thomson,Rutherford, and Bohr all have in common? | They each contributed to the development of the atomic theory.
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| In Thomson's plum-pudding model of the atom, the plums represent what? | Electrons
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| An atom of gold with 79 protons, 79 electrons, and 118 neutrons would have a mass number of? | 197
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| Which of the following has the least mass? | Electron
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| If an isotope of uranium, uranium-235, has 92 protons, how many protons does uranium-238 have? | 95
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| How did Democritus describe atoms? | A single material with one shape and size.
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| What is the smallest particle into which an element can be divided and still be the same substance? | Atom
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| Particle that cannot be cut | Atom
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| Negatively charged particle discovered by Thomson | Electron
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| Central region of the atom | Nucleus
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| Region where electrons are likely to be found | Electron cloud
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| Particle in the center of an atom that has no charge | Neutron
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| Subatomic particle that has a positive charge | Proton
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| A unit of mass that describes the mass of an atom or molecule | Atomic Mass Unit
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| Atom that has the same number of protons but different number of neutrons | Isotope
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| The sum of protons and neutrons in an atom | Mass number
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| How was Bohr's theory of atomic structure similar to and different from the current theory? | Bohr said there was no certain path for electrons, and in the current theory, the exact path cannot be predicted. But there is an electron cloud.
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| Describe atomic number and the atomic mass and explain the difference. | Atomic number tells how many protons are in the nucleus of an atom, while atomic mass tells the mass of an atom or molecule.
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| What was one of Dalton's ideas? | All substances are made of atoms
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| What is the meaning of atom? | Not able to be divided
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| Which statement about isotopes is true? | They have the same number of protons
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| According to Rutherford, what was in the center of an atom? | Nucleus
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| Which phrase describes radioactive isotopes? | They are unstable
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| Which of the following has the least mass in an atom? | Electron
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| Thomson discovered the negatively charged particles called | Electrons
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| Rutherford believed that each atom has a | Nucleus
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| The current atomic theory includes the _ model. | Electron cloud
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| All substances are made of | Atoms
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| Isotopes always have the same number of | Protons
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| Most elements have a mixture of two or more |
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| Protons stay together in the nucleus because of _ force. | Strong
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| Objects are pulled toward one another by _ force. | gravitational
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| Electrons around the nucleus are held in place by _ force. | electromagnetic
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
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To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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