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PScience Unit2test
Physical Science Unit 2 test -Connections Academy
| Question | Answer |
|---|---|
| The Greek Philsopher Democritus coined what word for a tiny piece of matter that cannot be divided ? | atom |
| According to John Dalton's observations, when elements combine in a compound, | the ratio of their masses is always the same. |
| J.J. Thomson's experiments provided evidence that an atom | contains negatively charged particles. |
| Which statement best describes Rutherford's model of the atom? | It is a like a huge stadium with a positively charged marble at the center. |
| The elements most likely to form more than one type of ion are the | transition metals. |
| The name Iron (II) indicates that a coumpound contains | iron ions with a 2+ charge. |
| Alkali metals, alkaline earth metals, and aluminum all form ions with positive charges equal to | the group number. |
| In the name carbon dioxide, the prefix of the 2nd word indicates that a molecule of carbon dioxide contains | two oxygen atoms. |
| Which subatomic particle has a negative charge? | electron |
| The number of protons in one atom of a element is the element's | atomic number |
| Which statement about subatomic particles is NOT true? | Protons and neutons have the same charge. |
| How many neutrons are in the isotope carbon-14? | 8 |
| In Niels Bohr's model of the atom, electrons move | like planets orbiting the sun. |
| Which statement about electrons and atomic orbitals is NOT TRUE? | An electron has the same amount of energy in all orbitals. |
| The glowing of a neon light is caused by electrons emitting energy as they | move from higher to lower energy levels. |
| What do scientists use to predit the locations of electrons in atoms? | probability |
| Which of the following most accurately represents John Dalton's model of the atom? | a tiny, solid sphere with a predictable mas for a given element |
| To find the number of neutrons in a atom, you would subtract | atomic number from mass number |
| How was Bohr's atomic model similar to Rutherford's model? | It described a nucleus surrounded by a large volume of space. |
| In a periodic table, a set of properties repeats from | row to row. |
| The results of Rutherford's gold foil experiment demonstrated that the ____________occupies a very small amount of the total space inside an atom. | nucleus |
| If element Q has 11 protons, its atomic ____________is 11. | number |
| The region in which an electron is most likely to be found is called a (an) | orbital or energy level |
| An atom in which an electron has moved to a higher energy level is in a ____________state. | excited |
| When Mendeleev organized elements in his periodic table in order of increasing mass, elements with similar properties were in the same ____________. | group |
| Mendeleev's periodic table was useful because it enabled scientists to predict properties of unknown _______________. | elements |
| Moving from left to right across a row of the periodic table, which of the following values increases by exactly one from element to element? | atomic number |
| The atomic mass of an element is | a weighted average of the masses of an element's isotopes. |
| Which general statement does NOT APPLY to metals? | Most metals are brittle. |
| Group 7A of the periodic table contains the | most reactive nonmetals. |
| The unit for atomic mass is | amu. |
| As you move from left to right across a period, the number of valance electrons | increases. |
| Compared with Group 2A elements, Group 6A elements have | more valance electrons |
| Typically, atoms gain or lose eletrons to achieve | a stable electron configuratiion. |
| The formation of an ionic bond involves | transfer of electrons. |
| In the compound, MgCl2, the subscript 2 indicates that | there are 2 chloride ions for each magnesium ion. |
| Which of the following is a typical property of an ionic compound? | tendency to shatter when struck. |
| The tendency of an element to react is closely related to | the number of valence electrons in atoms of the element. |
| Amoung the alkali metals, the tendency to react with other substances | increases from top to bottom within the group. |
| Which of the following groups contain 3 elements with stable electron configurations? | helium,xenon, neon |
| The formation of an ionic bond involves the | transfer of electrons. |
| Which type of bond is held together by the attractions between the protons in the nucleus and the shared electrons? | convalent bond |
| In a polar convalent bond, | electrons are not shared equally between atoms. |
| Because water molecules are polar, and carbon dioxide molecules are nonpolar, | water has a higher boiling point than carbon dioxide does. |
| The pattern of repeating properties of elements revealed in the periodic table is known as the | periodic law |
| To determine the atomic mass of an element, you would take a _______________ average of the isotopes that make up the element. | weighted |
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