January 2017 Chemistry Regents #11-15
Highlight to reveal answers and explanations
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Questions |
Answer | Links |
Explanations |
11 How many pairs of electrons are shared between the nitrogen atoms in
a molecule of N2?
(1) 5 (3) 3 (2) 2 (4) 6 |
3 | triple bond 3 pairs of electrons |
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12 A molecule must be nonpolar if the molecule
(1) is linear (2) is neutral (3) has ionic and covalent bonding (4) has a symmetrical charge distribution |
4 | SNAP
Symmetrical is nonpolar |
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13 Which property is used to determine the degree of polarity between
two bonded atoms?
(1) density (3) pressure (2) electronegativity (4) temperature |
2 |
Bond...BEND Bonding ElectroNegativity differences |
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14 In a chemical reaction, a catalyst provides an alternate reaction
pathway that
(1) decreases the concentration of the products (2) increases the concentration of the reactants (3) has a lower activation energy (4) has a higher activation energy |
3 | catalyst lowers the activation energy | |
15 Which substance can be decomposed by chemical means?
(1) cobalt (3) methane (2) krypton (4) zirconium |
3 |
a compound...methane CH4 the other 3 are elements |
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