August 2008 Chemistry Regents #11-20

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Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

Other Regents Exams

Questions	Answer	Explanations
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 solution? (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 chemical change? (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 draw them
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