Chem Aug 2010 Regents

50 Questions  I  By Ionca
Multiple choice + explanations. .?

  
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1.  The entropy of a sample of CO2 increases as the CO2 changes from 
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2.  Given the balanced equation representing a reaction: Br2 +energy→Br+Br Which statement describes the energy change and bonds in this reaction? 
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3.  Which substance can not be broken down by a chemical change? 
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4.  Which compound is insoluble in water?    
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5.  Object A at 40.°C and object B at 80.°C are placed in contact with each other. Which statement describes the heat flow between the objects? 
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6.  An atom of which element has the largest atomic radius? 
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7.  Which gas sample at STP has the same total number of molecules as 2.0 liters of CO2(g) at STP? 
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8.  Which element requires the least amount of energy to remove the most loosely held electron from a gaseous atom in the ground state? 
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9.   Which compound is an Arrhenius acid?    
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10.  As the temperature of a chemical reaction in the gas phase is increased, the rate of the reaction increases because 
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11.  Given the formula representing a molecule:     The molecule is 
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12.  Which isotope is used to treat cancer?    
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13.  Which formula represents a mixture?
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14.  A cylinder with a movable piston contains a sample of gas having a volume of 6.0 liters at 293 K and 1.0 atmosphere. What is the volume of the sample after the gas is heated to 303 K, while the pressure is held at 1.0 atmosphere? 
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15.  Which balanced equation represents a redox reaction? 
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16.  In the late 1800s, experiments using cathode ray tubes led to the discovery of the 
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17.  Which Group 15 element exists as diatomic molecules at STP? 
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18.  Which unit can be used to express the concentration of a solution? 
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19.  Every water molecule has two hydrogen atoms bonded to one oxygen atom. This fact supports the concept that elements in a compound are 
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20.  A balanced equation representing a chemical reaction can be written using 
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21.  Which compound has both ionic and covalent bonds
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22.  What is the total number of electrons shared in a double covalent bond? 
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23.  The reaction between an organic acid and an alcohol produces 
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24.  A gas sample is at 25°C and 1.0 atmosphere. Which changes in temperature and pressure will cause this sample to behave more like an ideal gas? 
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25.  Given the formula representing a hydrocarbon:     The molecular formula and the empirical formula for this hydrocarbon are 
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26.  Which element is present in all organic compounds? 
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27.  Which element forms an ionic compound when it reacts with lithium? 
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28.  Which two factors must be equal when a chemical reaction reaches equilibrium? 
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29.  In the formula X2(SO4)3, the X represents a metal. This metal could be located on the Periodic Table in 
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30.  Which energy conversion occurs during the operation of an electrolytic cell? 
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31.  Which formula represents an unsaturated hydrocarbon? 
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32.  The table below shows the number of subatomic particles in atom X and in atom Z.     Atom X and atom Z are isotopes of the element    
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33.  Which sample has particles with the lowest average kinetic energy?
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34.  Given the balanced equation representing a reaction: 2NaCl(l) → 2Na(l) + Cl2(g) A 1170.-gram sample of NaCl(l) completely reacts, producing 460. grams of Na(l). What is the total mass of Cl2(g) produced? 
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35.  Each of four test tubes contains a different concentration of HCl(aq) at 25°C. A 1-gram cube of Zn is added to each test tube. In which test tube is the reaction occurring at the fastest rate? 
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36.  In which type of reaction is an atom of one element converted to an atom of a different element? 
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37.  The bond between which two atoms is most polar? 
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38.  The percent composition by mass of nitrogen in NH4OH (gram-formula mass = 35 grams/mole) is equal to 
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39.  Which nuclide is listed with its half-life and decay mode? 
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40.  The atomic mass of titanium is 47.88 atomic mass units. This atomic mass represents the 
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41.  Which subatomic particles are located in the nucleus of an He-4 atom? 
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42.  According to one acid-base theory, water acts as an acid when an H2O molecule 
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43.  Based on the results of testing colorless solutions with indicators, which solution is most acidic? 
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44.  At STP, which element is solid, brittle, and a poor conductor of electricity? 
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45. 
  1. The greatest composition by mass in an atom of oxygen-18 is due to the total mass of its 
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46.  The isotopes K-37 and K-42 have the same   
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47.  What is the minimum amount of heat required to completely melt 20.0 grams of ice at its melting point? 
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48.  What is the total number of valence electrons in a calcium atom in the ground state? 
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49.  A solution with a pH of 2.0 has a hydronium ion concentration ten times greater than a solution with a pH of 
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50.  Petroleum can be separated by distillation because the hydrocarbons in petroleum are 
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