August 2008 Chemistry Regents #11-20
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11 Which property could be used to identify a
compound in the laboratory?
(1) mass (3) temperature
(2) melting point (4) volume
|2||melting point is a physical property|
|12 Which statement describes what occurs as two
atoms of bromine combine to become a
molecule of bromine?
(1) Energy is absorbed as a bond is formed.
(2) Energy is absorbed as a bond is broken.
(3) Energy is released as a bond is formed.
(4) Energy is released as a bond is broken.
|3||bond is formed and energy is released|
|4||each bond is 2 electrons
so 4 e-
|14 Solid ZnCl2 and liquid ZnCl2 have different
(1) empirical formulas (3) ion ratios
(2) formula masses (4) physical properties
|4||liquids and solid have different physical properties|
|15 Which phrase describes the molarity of a
(1) liters of solute per mole of solution
(2) liters of solution per mole of solution
(3) moles of solute per liter of solution
(4) moles of solution per liter of solution
|3||Table T look at equations|
|16 Which substance can not be decomposed by a
(1) AlCl3 (3) HI
(2) H2O (4) Cu
|4||Definition of an ELEMENT, 1 CAPITAL letter|
|17 Tetrachloromethane, CCl4, is classified as a
(1) compound because the atoms of the elements are combined in a fixed proportion
(2) compound because the atoms of the elements are combined in a proportion that varies
(3) mixture because the atoms of the elements are combined in a fixed proportion
(4) mixture because the atoms of the elements are combined in a proportion that varies
|1||2 CAPITAL letters, compound, fixed proportions|
|18 Which formulas represent two polar molecules?
(1) CO2 and HCl (3) H2O and HCl
(2) CO2 and CH4 (4) H2O and CH4
|3||asymmetrical is POLAR- SNAP
|19 Hydrocarbons are compounds that contain
(1) carbon, only
(2) carbon and hydrogen, only
(3) carbon, hydrogen, and oxygen, only
(4) carbon, hydrogen, oxygen, and nitrogen, only
|2||Definition of Hydrocarbon|
|20 The reaction that joins thousands of small,
identical molecules to form one very long
molecule is called
(1) esterification (3) polymerization
(2) fermentation (4) substitution
|3||Definition of Polymerization|
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