Multiple Choice Identify the
choice that best completes the statement or answers the question.


1.

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 


2.

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 



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    


3.

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 


4.

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 


5.

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 


6.

Which is the control in this experiment?
a.  Sample 1  c.  Sample 3  b.  Sample 2  d.  Sample 4 


7.

Which is the part of the experiment that is the measurable outcome?
a.  independent variable  c.  control  b.  dependent variable  d.  conclusion 


8.

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 


9.

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 


10.

Which is the correct measurement for location marked by the arrow?


11.

Which is the correct measurement for location marked by the arrow?
a.  17.076  c.  17.76  b.  17.8  d.  17.7 


12.

Which is the correct measurement for location marked by the arrow?
a.  30.5  c.  30.45  b.  34.5  d.  30.046 


13.

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 


14.

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/cm^{3})  7.874  19.32  10.49  8.92      
a.  Iron  c.  Silver  b.  Gold  d.  Copper 


15.

Which value has only 4 significant digits?
a.  6.930  c.  8450  b.  0.0450  d.  0.392 


16.

The accepted value for the density of iron is 7.87 g/cm^{3}. A student
records the mass of a 20.00cm^{3 }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% 


17.

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% 


18.

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 


19.

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 


20.

How many significant digits are in the value 530,405,000?


21.

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?



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    


22.

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?
a.  N_{2}O_{3}  c.  NO_{2}  b.  NO  d.  N_{2}O 


23.

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 


24.

Which is an example of a homogeneous mixture?
a.  sand  c.  vegetable soup  b.  clean air  d.  freshsqueezed orange
juice 


25.

The law of conservation of mass states that during a chemical reaction, total
mass is ____.
a.  created  c.  destroyed  b.  the same  d.  utilized 


26.

Which of the following substances is NOT an alloy?
a.  Brass  c.  Stainless steel  b.  Bronze  d.  Tin 


27.

A 76.00g 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 % 





28.

The box for an element from the periodic table is shown. Which is the atomic
mass?


29.

The box for an element from the periodic table is shown. Which is the atomic
number?


30.

Which scientist developed the model of the atom shown?
a.  Chadwick  c.  Rutherford  b.  Thomson  d.  Bohr 


31.

Which scientist developed the model of the atom shown?
a.  Chadwick  c.  Rutherford  b.  Thomson  d.  Bohr 


32.

Which has a charge of +1?
a.  proton  c.  electron  b.  atom  d.  neutron 


33.

Which one(s) have a mass of 1 amu?
a.  electron  c.  proton and neutron  b.  proton  d.  electron and
proton 



Atoms  Atom  Protons  Neutrons  Electrons  1  8  10  8  2  10  9  10  3  9  9  9  4  8  11  8     


34.

Which two are isotopes of one another?
a.  Atoms 1 & 2  c.  Atoms 1 & 3  b.  Atoms 2 & 3  d.  Atoms 1 & 4 





35.

What is the mass number of the atom shown?





36.

Which label identifies the amplitude of the wave shown?


37.

Which is the frequency of the wave shown?
a.  2 Hz  c.  2 sec  b.  0.5 Hz  d.  3 l 


38.

Which is the frequency of the wave shown?
a.  8 sec  c.  4 sec  b.  0.125 Hz  d.  0.5 Hz 


39.

Which type of orbital is shown?


40.

Which type of orbital is shown?


41.

Which is the correct number of valence electrons in the element Sulfur
(S)?


42.

Which element has the electron configuration
1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{4}?
a.  Titanium (Ti)  c.  Sulfur (S)  b.  Chromium (Cr)  d.  Selenium (Se) 


43.

Which is the correct electron configuration for the element Molybdenum
(Mo)?
a.  1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{4}  c.  1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}4d^{10}4p^{6}5s^{2}5d^{4}  b.  1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{6}  d.  1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{2}4d^{4} 


44.

Which is the correct electron dot diagram for the element Silicon (Si)?


45.

Which category of elements have the property of being malleable and
ductile?
a.  gases  c.  metalloids  b.  metals  d.  nonmetals 


46.

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 





47.

Which region is referred to as the pblock on the diagram?





48.

Which diagram correctly depicts the trend in electronegativity?


49.

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 electricityconducting
properties    


50.

Which block contains 5 orbitals?


51.

_____ is the combining of nuclei.
a.  fission  c.  decay  b.  fusion  d.  denaturation 


52.

Which type of radiation is the most penetrating?
a.  alpha  c.  gamma  b.  beta  d.  all three are essentially
equal 


53.

Alpha particles have a _____ charge.


54.

Beta particles have a _____ charge.


55.

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 halflife period of is 5770
years, find the number of years elapsed.

Completion Complete each
statement.


56.

Chemistry is the study of _____________________ and the changes that it
undergoes.


57.

100.00 meters + 50.000 centimeters + 1.0000 kilometer = ____________________ meters.


58.

A process that involves one or more substances changing into new substances is
known as a ____________________ change.


59.

Cutting a sheet of paper is an example of a ____________________ change.

Short Answer


60.

Explain how hypothesis and theory are different.



Use the figure below to answer the question.


61.

Infer a qualitative measurement that can be made from the scene shown.


62.

Infer a quantitative measurement that can be made from the scene shown.


63.

Define an independent variable in an experiment. Explain the term with respect
to the solubility of salt at different temperatures.


64.

Convert 600 mg to grams.


65.

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?


66.

What is the average atomic mass of this element? Isotope  Mass (amu)  Percent Abundance  Phosphorus29  29  5%  Phosphorus31  31  71%  Phosphorus32  32  24%    


67.

What is the average atomic mass of this element? Isotope  Mass (amu)  Percent Abundance  Silver105  105  48%  Silver108  108  43%  Silver109  109  9%    


68.

Write the nuclear equation to describe the betadecay of boron12.


69.

Use the model of the atom shown to identify the correct element. Write the
electron configuration and orbital diagram for this element.


70.

Which rule for filling of orbitals by electrons in the element Silicon is being
violated in the orbital diagram shown? Justify your answer.


71.

Which rule for the filling of orbitals in the element Phosphorus is being
violated in the orbital diagram shown? Justify your answer.


72.

Which rule for the filling of orbitals by electrons in the element Magnesium is
being violated? Justify your answer.


73.

Explain what is wrong with this electron dot diagram for the element Nitrogen
(N).


74.

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


75.

Place these five elements in order of electronegativity, with the highest
electronegativity first.


76.

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.


77.

Calculate the remaining amount of 100.0 grams of cobalt60 after 1600 years. The
half life of cobalt60 is 5272 years.


78.

A sample of wood from an archeological dig was found to contain 40% of
^{14}C compared to wood found today. The halflife of ^{14}C is 5770 years. Calculate
the number of elapsed years.


79.

160.0 grams of radium 226 is reduced to 114.6 grams in 782 years. What is the
half life of the compound?

Problem


80.

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?


81.

When a 5.00g metal piece, A, was immersed in 38.0 mL of water, the water level
rose to 50.0 mL. Similarly, when a 5.00g 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.


82.

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        


83.

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     

Essay


84.

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.

Other


85.

In a (an)
____________ Universe nothing can make more of something. In a (an)
______________ Universe something and nothing are opposites.
