August 2007 Chemistry Regents #11-20

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

 

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Questions

Answer Explanations
11 Given the balanced equation representing a reaction:
H+(aq) + OH-(aq) =>H2O(l ) + 55.8 kJ
In this reaction there is conservation of
(1) mass, only
(2) mass and charge, only
(3) mass and energy, only
(4) mass, charge, and energy
4 all are conserver ALWAYS
12 Which polyatomic ion contains the greatest number of oxygen atoms?
(1) acetate (3) hydroxide
(2) carbonate (4) peroxide
2 Table E
13 Which formula represents an ionic compound?
(1) H2       (3) CH3OH
(2) CH4    (4) NH4Cl
4 look for the polyatomic ION

(usually metal and nonmetal bonded but not here)

14 An ion of which element has a larger radius than an atom of the same element?
(1) aluminum  (3) magnesium
(2) chlorine    (4) sodium
2 the nonmetal
15 Which statement must be true when solution equilibrium occurs?
(1) The solution is at STP.
(2) The solution is supersaturated.
(3) The concentration of the solution remains constant.
(4) The masses of the dissolved solute
3 ConCon Requal

concentrations constant rates are equal

16 Which liquid has the highest vapor pressure at 75C?
(1) ethanoic acid  (3) propanone
(2) ethanol           (4) water
3 Table H
17 What is the total number of different elements present in NH4NO3?
(1) 7    (3) 3
(2) 9    (4) 4
3 count the different CAPITAL letters
18 Which sample of matter is a single substance?
(1) air                 (3) hydrochloric acid
(2) ammonia gas (4) salt water
2 3 are mixtures (not pure)

HCl is a compound

19 At STP, which sample contains the same number of molecules as 11.2 liters of CO2(g) at STP?
(1) 5.6 L of NO2(g)     (3) 11.2 L of N2(g)
(2) 7.5 L of H2(g)       (4) 22.4 L of CO(g)
3 Avogadro's hypothesis

equal volumes contain equal numbers of molecules at the same temperature and pressure

20 A sample of gas is held at constant pressure. Increasing the Kelvin temperature of this gas sample causes the average kinetic energy of its molecules to
(1) decrease and the volume of the gas sample to decrease
(2) decrease and the volume of the gas sample to increase
(3) increase and the volume of the gas sample to decrease
(4) increase and the volume of the gas sample to increase
4 avg KE is temperature

volume and temperature are directly related

Charles's Law

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

 
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