Acids, Bases, and pH

Practice Test
      
  1.The fourth energy level can hold _______ more electrons than the third energy level.  
  a.   14  
  b.   6  
  c.   2  
  d.   10  
      
  2.According to the equation 2HBr + Na2CO3 NaBr + H2O + CO2, what volume of CO2 at 1.230 atm and 325 K is produced by 50.0 g of HBr reacting with an excess of Na2CO3?  
  a.   50.0 L  
  b.   1.52 L  
  c.   6.70 L  
  d.   22.4 L  
      
  3.A solution that contains very little solute is described as ____________.  
  a.   saturated  
  b.   massive  
  c.   dilute  
  d.   concentrated  
      
  4.What is the formula for perchloric acid?  
  a.   HCl  
  b.   HClO4  
  c.   HClO2  
  d.   HClO3  
      
  5.How many atoms of carbon are in a pure sample of carbon having a mass of 72.0 g?  
  a.   3.6 x 10 23  
  b.   4.33 x 10 25  
  c.   36 x 10 24  
  d.   3.6 x 10 24  
      
  6.The pH scale is used to express the concentrations of hydronium ions and _____________ ions in aqueous solutions.  
  a.   carbon  
  b.   potassium  
  c.   hydroxide  
  d.   fluoride  
      
  7.A chemical bond that results from a shared pool of valence electrons is called a ____________ bond.  
  a.   ionic  
  b.   directional  
  c.   polar covalent  
  d.   metallic  
      
  8.How many grams of NaCl are dissolved in 500.0 mL of a 0.05M solution of NaCl?  
  a.   0.05 g  
  b.   0.29 g  
  c.   1.46 g  
  d.   2.92 g  
      
  9.H2O is sometimes called ________________.  
  a.   a poor solvent  
  b.   a solution  
  c.   a specific solute  
  d.   the universal solvent  
      
  10.The light emitted by the gas in a neon sign is _________________.  
  a.   an incandescent light  
  b.   a filament  
  c.   an electron  
  d.   an emission spectrum  
      
  11.These compounds have a bitter taste and a slippery feel.  
  a.   acids  
  b.   hydrocarbons  
  c.   salts  
  d.   bases  
      
  12.Calculate the number of moles of hydrogen atoms in 4.75 mol sulfuric acid.  
  a.   4.75 mol  
  b.   2.38 mol  
  c.   9.50 mol  
  d.   33.2 mol  
      
  13.A base is a substance that produces ____________ ions when it dissolves in water.  
  a.   hydronium  
  b.   hydroxide  
  c.   carbonate  
  d.   sodium  
      
  14.


The center of positive charge in the H2O molecule lies ______________________.
 
  a.   between the two hydrogen atoms  
  b.   in the geometric center of the molecule  
  c.   on the oxygen atom  
  d.   on one of the hydrogen atoms  
      
  15.The boiling point of methane, CH4, is ___________ than that of water.  
  a.   slightly higher  
  b.   much higher  
  c.   much lower  
  d.   slightly higher  
      
  16.If the theoretical yield of a reaction is 0.2100 g and the actual yield is 0.1880 g, what is the percent yield?  
  a.   112%  
  b.   89.50%  
  c.   51.30%  
  d.   11.00%  
      
  17.Water forms ______________ in a glass tube.  
  a.   a convex meniscus  
  b.   a concave meniscus  
  c.   heavy water  
  d.   hydrogen and oxygen  
      
  18.The two rows beneath the main body of the periodic table contain the _________________.  
  a.   halogens  
  b.   inner transition elements  
  c.   noble gases  
  d.   alkali metals  
      
  19.These orbitals are aligned along the x, y, and z axes.  
  a.   p orbitals  
  b.   d orbitals  
  c.   s orbitals  
  d.   f orbitals  
      
  20._____________ is the measure of an atom's ability to attract electrons in a bond.  
  a.   Ionic radius  
  b.   Shielding  
  c.   melting point  
  d.   Electronegativity  

 
   
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