Chemistry: The Science of Matter

Practice Test
      
  1. Crushing a substance ____________.  
  a.   is a chemical change  
  b.   increases its density  
  c.   is a physical change  
  d.   decreases its melting point  
      
  2.This substance decomposes to produce carbon, hydrogen, and oxygen. It may be ______________.  
  a.   sucrose  
  b.   table salt  
  c.   bronze  
  d.   ammonia  
      
  3.An exothermic reaction is one that _______________.  
  a.   produces a solid  
  b.   causes a color change  
  c.   gives off energy  
  d.   absorbs energy  
      
  4.What element makes up approximately 65% of your body by mass?  
  a.   hydrogen  
  b.   oxygen  
  c.   calcium  
  d.   nitrogen  
      
  5.A sample of gold has a mass of 15.7 g and displaces 0.81 cm3 of water in a graduated cylinder. What is the density of gold?  
  a.   0.81 g/cm3  
  b.   19.3 g/cm3  
  c.   14.9 g/cm3  
  d.   .05 g/cm3  
      
  6.Which of the following is a chemical property of iron?  
  a.   Its density is 7.87 g/mL.  
  b.   It conducts electricity.  
  c.   It rusts.  
  d.   It is a solid at room temperature.  
      
  7.The density of cork is _______________.  
  a.   11.34 1.00 g/mL  
  b.   less than 1.00 g/mL  
  c.   more than 1.00 g/mL  
  d.   1.00 g/mL  
      
  8.The color of a substance is called a __________.  
  a.   chemical change  
  b.   physical property  
  c.   chemical property  
  d.   physical change  
      
  9.An object has a mass of 20.0 g and a volume of 10.0 mL. What is its density?  
  a.   2.00 g/mL  
  b.   20.0 g  
  c.   10.0 mL  
  d.   0.500 g/mL  
      
  10.Photosynthesis is _______________.  
  a.   a physical change  
  b.   exothermic  
  c.   endothermic  
  d.   a substance  

 
   
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