June 2017 Chemistry Regents #6-10
Highlight to reveal answers and explanations
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Questions | Answer | Links | Explanations |
6. On the Periodic Table, the number of protons in an atom of an element is indicated by its (l) atomic mass (2) atomic number (3) selected oxidation states (4) number of valence electrons | 2 | link | protons are equal to the atomic number of the element |
7 Which type of formula shows an element symbol for each atom and a line for each bond between atoms? (1) ionic (3) empirical (2) structural (4) molecular | 2 | link | structural formula is the one with the bonds, you know the structure of the compound |
8. What is conserved during all chemical reactions? (1) charge (3) vapor pressure (2) density (4) melting point | 1 | charge, mass and energy are always conserved | |
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9. In which type of reaction can two compounds exchange ions to form two different compounds? (1) synthesis (2) decomposition (3) single replacement (4) double replacement | 4 | link | AB + CD==> AD + CB
Double replacement |
10 At STP, two 5.0-gram solid samples of different ionic compounds have the same density. These solid samples could be differentiated by their (1) mass (3) temperature (2) volume (4) solubility in water | 4 | link | Just ask your self can 2 different objects have the same.... mass...yes temp...yes volume...yes solubility...nope Table G |
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