August 2005 Chemistry Regents #41-50
Highlight to reveal answers and explanations
Other Regents Exams
41 What is the total number of moles of NaCl(s)
needed to make 3.0 liters of a 2.0 M NaCl solution?
(1) 1.0 mol (3) 6.0 mol
(2) 0.70 mol (4) 8.0 mol
|3||M=mol/L Table T
3.0L x 2.0M=
|4||nonmetal ion 8 valance electrons and a negative charge|
|43 A student wants to prepare a 1.0-liter solution of
a specific Molarity. The student determines that
the mass of the solute needs to be 30. grams.
What is the proper procedure to follow?
(1) Add 30. g of solute to 1.0 L of solvent.
(2) Add 30. g of solute to 970. mL of solvent to make 1.0 L of solution.
(3) Add 1000. g of solvent to 30. g of solute.
(4) Add enough solvent to 30. g of solute to make 1.0 L of solution.
|44 What is the total number of joules released when
a 5.00-gram sample of water changes from liquid
to solid at 0°C?
(1) 334 J (3) 2260 J
(2) 1670 J (4) 11 300 J
q=5 x 334
|45 Which set of procedures and observations indicates
a chemical change?
(1) Ethanol is added to an empty beaker and the ethanol eventually disappears.
(2) A solid is gently heated in a crucible and the solid slowly turns to liquid.
(3) Large crystals are crushed with a mortar and pestle and become powder.
(4) A cool, shiny metal is added to water in a beaker and rapid bubbling occurs.
|4||look for the obvious chemical reaction|
|46 At STP, a sample of which element has the
(1) Na(s) (3) Br2(l)
(2) Hg(l) (4) F2(g)
|4||gas has the highest entropy
|47 Given the incomplete equation representing an
organic addition reaction:
X(g) + Cl2(g)==> XCl2(g)
Which compound could be represented by X?
(1) CH (3) C3H8
(2) C2H4 (4) C4H10
|2||addition=unsaturated (alkene or
note the vowels hint hint
|48 Given the incomplete equation:
4Fe + 3O2 ==> 2X
Which compound is represented by X?
(1) FeO (3) Fe3O2
(2) Fe2O3 (4) Fe3O4
|2||4Fe6O / 2= Fe2O3|
|49 How are HNO3(aq) and CH3COOH(aq) similar?
(1) They are Arrhenius acids and they turn blue litmus red.
(2) They are Arrhenius acids and they turn red litmus blue.
(3) They are Arrhenius bases and they turn blue litmus red.
(4) They are Arrhenius bases and they turn red litmus blue.
use Table M
|4||alpha beta beta
use table O
|Back to Regents Exams|