Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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Which precaution should you take when you see this symbol?  a. | do not look directly at the experiment | b. | wear goggles if you are doing the
experiment | c. | wear goggles if you are performing or observing the experiment | d. | watch the teacher
carefully and follow what he or she does |
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2.
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These three solid blocks are made of the same material and have the exact same
dimensions. Which block has the greatest weight? a. | Block A | c. | Block C | b. | Block B | d. | They all have the same
weight |
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A student conducts an experiment to determine the effect of adding salt on the
boiling temperature of water. The results are shown below. | Sample | Amount of Salt | Boiling Temperature | | Sample 1 | 0 g | 100.0° C | | Sample 2 | 2 g | 102.3°
C | | Sample 3 | 5 g | 104.8°
C | | Sample 4 | 10 g | 107.5°
C | | | |
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3.
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Which is the independent variable in this experiment?
a. | Amount of salt added | c. | Boiling temperature | b. | Volume of water | d. | Time required for water to
boil |
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4.
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Which is the dependent variable in this experiment?
a. | Amount of salt added | c. | Boiling temperature | b. | Volume of water | d. | Time required for water to
boil |
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5.
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Which is a value that should remain constant for all samples in this
experiment?
a. | Amount of salt added | c. | Boiling temperature | b. | Volume of water | d. | Time required for water to
boil |
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6.
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Which is the control in this experiment?
a. | Sample 1 | c. | Sample 3 | b. | Sample 2 | d. | Sample 4 |
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7.
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Which is the part of the experiment that is the measurable outcome?
a. | independent variable | c. | control | b. | dependent variable | d. | conclusion |
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8.
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Which kind of graph would be best to use with these data? M&M’s™ in a bag
| Color | Orange | Brown | Yellow | Green | Blue | Red | | Percent | 20 | 13 | 14 | 16 | 24 | 13 | | | | | | | |
a. | Line graph | c. | Bar graph | b. | Circle graph | d. | None of the
above |
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9.
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Which kind of graph would be best to use with these data? | Day of the Week | Monday | Tuesday | Wednesday | Thursday | Friday | | Table Monitor | Maria | James | Tyler | Ashley | Daniel | | | | | | |
a. | Line graph | c. | Bar graph | b. | Circle graph | d. | None of the
above |
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10.
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Which is the correct measurement for location marked by the arrow? 
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11.
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Which is the correct measurement for location marked by the arrow?  a. | 17.076 | c. | 17.76 | b. | 17.8 | d. | 17.7 |
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12.
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Which is the correct measurement for location marked by the arrow?  a. | 30.5 | c. | 30.45 | b. | 34.5 | d. | 30.046 |
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13.
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The accepted value is 29.35. Which correctly describes this student’s
experimental data? | Trial | Measurement | | 1 | 29.48 | | 2 | 28.97 | | 3 | 29.27 | | |
a. | accurate but not precise | c. | both accurate and
precise | b. | precise but not accurate | d. | neither accurate nor precise |
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14.
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An object has a mass of 26.94 grams and a volume of 2.568 cubic centimeters.
What material is it likely to be made of? | Substance | iron | gold | silver | copper | | Density
(g/cm3) | 7.874 | 19.32 | 10.49 | 8.92 | | | | | |
a. | Iron | c. | Silver | b. | Gold | d. | Copper |
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15.
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Which value has only 4 significant digits?
a. | 6.930 | c. | 8450 | b. | 0.0450 | d. | 0.392 |
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16.
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The accepted value for the density of iron is 7.87 g/cm3. A student
records the mass of a 20.00-cm3 block of iron as 153.8 grams. What is the percent error
for the density measurement?
a. | 19.4% | c. | 2.29% | b. | 7.69% | d. | 2.34% |
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17.
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The accepted value for a quantity is 5.67 g. If the measured value is 5.89 g,
what is the percent error?
a. | 1.04% | c. | 3.74% | b. | 3.74% | d. | 3.88% |
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18.
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Which is the sum of these values, to the appropriate number of significant
digits?
17.358 + 3.502 + 20.14 =
a. | 41 | c. | 41.000 | b. | 41.00 | d. | 41.0 |
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19.
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Which is the product of these numbers, to the appropriate number of significant
digits?
56.2 ´ 9.2057 =
a. | 517 | c. | 517.36 | b. | 517.4 | d. | 517.00 |
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20.
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How many significant digits are in the value 530,405,000?
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21.
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The figure shows the results of paper chromatography of a mixture of pigments.
Based on the results shown, which pigment has the greatest attraction for the paper? 
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Gas Samples | | Sample | Volume of Nitrogen (L) | Volume of Oxygen (L) | | 1 | 2.00 | 3.02 | | 2 | 1.01 | 1.99 | | 3 | 1.98 | 4.99 | | 4 | 1.98 | 1.02 | | | |
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22.
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Samples of gases containing nitrogen and oxygen were decomposed by electricity
and the volume of each gas produced was measured. Based on these results, which is the correct
chemical formula for Sample 2?
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23.
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Which is NOT a chemical change?
a. | a piece of wood is burned | c. | a bar of iron
rusts | b. | an egg is cooked | d. | ingredients for a cake are stirred together |
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24.
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Which is an example of a homogeneous mixture?
a. | sand | c. | vegetable soup | b. | clean air | d. | fresh-squeezed orange
juice |
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25.
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The law of conservation of mass states that during a chemical reaction, total
mass is ____.
a. | created | c. | destroyed | b. | the same | d. | utilized |
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26.
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Which of the following substances is NOT an alloy?
a. | Brass | c. | Stainless steel | b. | Bronze | d. | Tin |
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27.
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A 76.00-g sample of an unknown compound contains 12.90 g of sulphur. What is the
percentage by mass of sulphur in the compound?
a. | 0.17 % | c. | 63.10 % | b. | 16.97 % | d. | 88.90 % |
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28.
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The box for an element from the periodic table is shown. Which is the atomic
mass?
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29.
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The box for an element from the periodic table is shown. Which is the atomic
number?
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30.
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Which scientist developed the model of the atom shown?  a. | Chadwick | c. | Rutherford | b. | Thomson | d. | Bohr |
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31.
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Which scientist developed the model of the atom shown?  a. | Chadwick | c. | Rutherford | b. | Thomson | d. | Bohr |
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32.
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Which has a charge of +1?
a. | proton | c. | electron | b. | atom | d. | neutron |
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33.
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Which one(s) have a mass of 1 amu?
a. | electron | c. | proton and neutron | b. | proton | d. | electron and
proton |
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Atoms | | Atom | Protons | Neutrons | Electrons | | 1 | 8 | 10 | 8 | | 2 | 10 | 9 | 10 | | 3 | 9 | 9 | 9 | | 4 | 8 | 11 | 8 | | | | |
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34.
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Which two are isotopes of one another?
a. | Atoms 1 & 2 | c. | Atoms 1 & 3 | b. | Atoms 2 & 3 | d. | Atoms 1 & 4 |
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35.
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What is the mass number of the atom shown?
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36.
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Which label identifies the amplitude of the wave shown?
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37.
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Which is the frequency of the wave shown?  a. | 2 Hz | c. | 2 sec | b. | 0.5 Hz | d. | 3 l |
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38.
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Which is the frequency of the wave shown?  a. | 8 sec | c. | 4 sec | b. | 0.125 Hz | d. | 0.5 Hz |
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39.
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Which type of orbital is shown? 
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40.
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Which type of orbital is shown? 
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41.
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Which is the correct number of valence electrons in the element Sulfur
(S)?
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42.
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Which element has the electron configuration
1s22s22p63s23p64s23d4?
a. | Titanium (Ti) | c. | Sulfur (S) | b. | Chromium (Cr) | d. | Selenium (Se) |
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43.
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Which is the correct electron configuration for the element Molybdenum
(Mo)?
a. | 1s22s22p63s23p64s23d4 | c. | 1s22s22p63s23p64s24d104p65s25d4 | b. | 1s22s22p63s23p64s23d104p65s6 | d. | 1s22s22p63s23p64s23d104p65s24d4 |
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44.
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Which is the correct electron dot diagram for the element Silicon (Si)? 
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45.
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Which category of elements have the property of being malleable and
ductile?
a. | gases | c. | metalloids | b. | metals | d. | nonmetals |
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46.
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Which category of elements is commonly used to make computer chips and solar
cells due to their ability to conduct electricity only under certain conditions?
a. | metals | c. | nonmetals | b. | metalloids | d. | noble gases |
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47.
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Which region is referred to as the p-block on the diagram?
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48.
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Which diagram correctly depicts the trend in electronegativity?
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49.
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Which block is element Y most likely found in? | Element | Block | Characteristics | X | s | Soft, shiny grey metal;
highly reactive, lightweight | Y | ? | Liquid at room
temperature; has the highest electronegativity in its period | Z | p | Used as a semiconductor due to its electricity-conducting
properties | | | |
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50.
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Which block contains 5 orbitals?
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51.
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_____ is the combining of nuclei.
a. | fission | c. | decay | b. | fusion | d. | denaturation |
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52.
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Which type of radiation is the most penetrating?
a. | alpha | c. | gamma | b. | beta | d. | all three are essentially
equal |
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53.
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Alpha particles have a _____ charge.
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54.
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Beta particles have a _____ charge.
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55.
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A sample of wood from the remains of a ship was found to contain 40.0% of  as of ordinary wood found now. If the half-life period of  is 5770
years, find the number of years elapsed.
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Completion
Complete each
statement.
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56.
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Chemistry is the study of _____________________ and the changes that it
undergoes.
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57.
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100.00 meters + 50.000 centimeters + 1.0000 kilometer = ____________________ meters.
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58.
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A process that involves one or more substances changing into new substances is
known as a ____________________ change.
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59.
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Cutting a sheet of paper is an example of a ____________________ change.
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Short Answer
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60.
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Explain how hypothesis and theory are different.
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Use the figure below to answer the question.
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61.
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Infer a qualitative measurement that can be made from the scene shown.
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62.
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Infer a quantitative measurement that can be made from the scene shown.
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63.
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Define an independent variable in an experiment. Explain the term with respect
to the solubility of salt at different temperatures.
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64.
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Convert 600 mg to grams.
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65.
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If 19.9 grams of copper are burned in air to produce 25.0 grams of copper oxide,
what is the mass of oxygen from the air that is needed?
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66.
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What is the average atomic mass of this element? | Isotope | Mass (amu) | Percent Abundance | | Phosphorus-29 | 29 | 5% | | Phosphorus-31 | 31 | 71% | | Phosphorus-32 | 32 | 24% | | | |
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67.
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What is the average atomic mass of this element? | Isotope | Mass (amu) | Percent Abundance | | Silver-105 | 105 | 48% | | Silver-108 | 108 | 43% | | Silver-109 | 109 | 9% | | | |
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68.
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Write the nuclear equation to describe the beta-decay of boron-12.
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69.
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Use the model of the atom shown to identify the correct element. Write the
electron configuration and orbital diagram for this element. 
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70.
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Which rule for filling of orbitals by electrons in the element Silicon is being
violated in the orbital diagram shown? Justify your answer. 
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71.
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Which rule for the filling of orbitals in the element Phosphorus is being
violated in the orbital diagram shown? Justify your answer. 
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72.
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Which rule for the filling of orbitals by electrons in the element Magnesium is
being violated? Justify your answer. 
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73.
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Explain what is wrong with this electron dot diagram for the element Nitrogen
(N). 
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74.
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Label the blank periodic table with the following terms.  A: metalloids B: element with the highest electronegativity C: alkali
metals D: lanthanide series E: element with the greatest atomic radius F: noble gases G:
halogens
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75.
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Place these five elements in order of electronegativity, with the highest
electronegativity first. 
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76.
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Iron 59, a radioactive isotope, has a half life of 46 days. Calculate the time
by which 30.0 micrograms falls to 14% of the initial value in the body of a cancer patient.
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77.
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Calculate the remaining amount of 100.0 grams of cobalt-60 after 1600 years. The
half life of cobalt-60 is 5272 years.
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78.
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A sample of wood from an archeological dig was found to contain 40% of
14C compared to wood found today. The half-life of 14C is 5770 years. Calculate
the number of elapsed years.
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79.
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160.0 grams of radium 226 is reduced to 114.6 grams in 782 years. What is the
half life of the compound?
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Problem
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80.
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A vessel contains 30 mL of water. A sample of 5.0 g of copper metal is dropped
into this vessel, raising the level of water in it to 40 mL. What is the density of the copper
sample?
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81.
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When a 5.00-g metal piece, A, was immersed in 38.0 mL of water, the water level
rose to 50.0 mL. Similarly, when a 5.00-g metal piece, B, was immersed in 38.0 mL of water, the level
of water rose to 60.0 mL. Compare the density of the metal pieces, A and B.
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82.
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Complete the following table: | Element | Number of
protons | Number of electrons | Number of
neutrons | Atomic number | Mass number | | Sodium | | 11 | 12 | | | | Phosphorus | 15 | | | | 31 | | Cobalt | 27 | | 32 | | | | Bromine | | 35 | | | 80 | | Silver | | | 61 | 47 | | | | | | | |
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83.
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Complete the nuclear equations for the isotopes given in the table
below: | Isotope | Decay | Nuclear equation | | Carbon - 14 | beta | | | Radium - 226 | alpha | | | Uranium - 238 | alpha and gamma | | | | |
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Essay
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84.
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Design an experiment to test the effects of drinking caffeinated beverages on
students’ heart rates. In your answer, include a description of your hypothesis, independent
and dependent variables, constants, and controls.
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Other
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85.
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In a (an)
____________ Universe nothing can make more of something.
In a (an)
______________ Universe something and nothing are opposites.
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