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Chapter 1
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1. Which of the following is made from only one element?
aluminum foil brass bronze common table salt
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2. Chromatography is used to separate compounds into elements.
True false
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3. Forensic science tries to provide a scientifically sound explanation of past events.
True False
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4. How are gases characterized?
by small distances between particles that are moving at low speeds by small distances between particles that are moving at high speeds by large distances between particles that are moving at low speeds by large distances between particles that are moving at high speeds
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5. What does forensic science deal with?
The application of facts to legal matters The application of science to legal matters and crime solving The use of machinery in crime solving The application of science exclusively to crime solving
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6. What does the subscript “2” mean in the formula CaCl2?
two atoms of Ca and Cl two units of CaCl two molecules of chlorine two atoms of chlorine
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7. The smallest unit of an element is an atom.
True False
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8. Which of the following represents the states of matter from least to most ordered?
liquids, solids, gases gases, solids, liquids solids, liquids, gases gases, liquids, solids
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9. Forensic chemistry can be used to determine the composition of
drugs explosives both of the above neither of the above
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10. Which of the following elements are metals?
iron, lead, calcium iron, lead, chlorine iodine, lead, calcium iron, phosphorus, calcium
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11. What is the proper formula for magnesium flouride, which has 1 atom of magnesium, and 2 of flourine? MgF Mg2F Mg2F2 MgF2
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12. What is the correct element name that goes with the elemental symbol Cu?
gold silver copper lead
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13. Pure substances have a uniform composition and cannot be separated by physical methods are always elements are solids in most cases have a uniform composition that can be separated by physical methods
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14. What is the element name that corresponds to the elemental symbol Ag?
astatine platinum gold silver
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15. What are the correct atomic symbols that correspond to carbon, copper, and cobalt?
Co, C, and Sb C, Ca, and Co Ca, Cu, and Co C, Cu, and Co
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16. Elements are defined as the simplest form of a mixture.
True False
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17. K is the symbol for which element?
potassium polonium phosphorus sodium
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18. What are solids? the least ordered state of matter
material never composed of atoms the most ordered state of matter always composed of compounds
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19. What elements are present, and how many atoms of each are in the compound MgCl2?
1 atom of magnesium and 2 atoms of cobalt 1 atom of magnesium and 2 atoms of chlorine 2 atoms of magnesium and 1 atom of cobalt 2 atoms of magnesium and 1 atom of chlorine
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20. What best describes sugar when it is dissolved in water?
a compound an alloy a heterogeneous compound a mixture
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21. What are two of the properties of non-metallic elements?
They conduct both heat and electricity. They conduct heat but not electricity. They conduct neither heat nor electricity. They conduct electricity but not heat.
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22. What elements are present, and how many atoms of each are in the compound Fe2O3?
2 atoms of iron and 3 atoms of oxygen 2 atoms of fluorine and 3 atoms of oxygen 3 atoms of iron and 2 atoms of oxygen 3 atoms of fluorine and two atoms of oxygen
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homogeneous complete heterogeneous molecular
23. When two or more substances are mixed and evenly distributed that a sample from any one part of the mixture is chemically identical to a sample from any other part, the mixture is said to be homogeneous complete heterogeneous molecular
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24. A molecule is defined as an atom.
True False
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25. Which of the following elements is a metalloid?
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26. The name that corresponds to the elemental symbol Au is
iron lead gold tin
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27. How can mixtures be separated?
evaporation filtering both of the above neither of the above
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28. What is the name of the element that uses the symbol Na?
potassium sodium soda selenium
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29. Which is the correct name that corresponds to the elemental symbol P?
lead phosphorus potassium tin
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30. Common table salt, sodium chloride, is an example of what?
a mixture an element a homogeneous mixture a compound
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31. What is constant in a liquid?
volume shape both of the above neither of the above
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32. Write the formula for sodium chloride, which has 1 atom of sodium and 1 of chlorine.
NaCl NaCl2 Na2Cl Na2Cl2
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33. The name that corresponds to the elemental symbol Fe is:
iron fluorine francium astatine
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34. Rh is the element symbol for which element?
rhodium rubidium rhenium ruthenium
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35. Which series of elements are metalloids?
tungsten, silicon, and aluminium tungsten, sulfur, and silver germanium, antimony, and sulfur silicon, germanium, and antimony
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36. What can elements form when they react with other substances?
isotopes compounds decay products mixtures
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37. What element name corresponds to the elemental symbol Sn?
antimony lead tin arsenic
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38. What name is represented by the elemental symbol Hg?
hydrogen mercury helium holmium
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39. A mixture is two or more substances that are mixed and chemically bonded to each other.
True False
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40. To which group of the periodic table do magnesium and calcium belong?
Alkaline earth metals Transition metals Halogens actinides
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41. The halogens are found in which group of the periodic table
Groups 3-12 Group 18
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42. Based on electronegativity values, which type of elements tends to have the greatest attraction for electrons in a bond? Metals Metalloids Nonmetals Noble gases
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43. Which of the following sections of the periodic table contains only nonmetals?
Group 2 Group 18 Period 2 Period 6
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44. Metals typically are: Good conductors of electrical current
Malleable Ductile All of these
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45. To which group of the periodic table do fluorine and iodine belong?
Alkali metals Alkali earth metals Halogens Rare earth metals
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46. Transition elements are found in which of the following group(s) of the periodic table?
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47. Which list consists of elements that have the most similar chemical properties?
Li, Na, K Mg, Cu, O Ne, Hg, Na Ag, Au, N
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48. Which of the following graphs best shows the relationship between an element’s atomic mass and its atomic number? A B C D
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49. Sodium and potassium have similar chemical properties because the atoms of both elements have the same Mass number Atomic number Energy levels Valence electrons
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50. Which grouping of circles, when considered in order from the top to the bottom, best represents the relative size of the atoms of Be, Mg, Ca, and Sr respectively? A B C D
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