Name: 
 

8th Grade Miterm 2009_2010A


True/False
Indicate whether the sentence or statement is true or false.
 

 1. 
Subscripts may be used to balance chemical equations.
 

 2. 
The nucleus of an atom is positively charged.      .
 

 3. 
The amount of matter in an object determines its weight.
 

 4. 
The nucleus makes up about 99.9 percent of the mass of the atom.
 

 5. 
Nonmetals have relatively high melting points.
 

 6. 
Most of the elements of the periodic table exist naturally as solids.
 

 7. 
A reactant is formed as a result of a chemical reaction.
 

 8. 
An amorphous solid can be thought of as a slow-moving liquid.
 

 9. 
An alloy is a type of heterogeneous mixture
 

 10. 
Ctf010-1.jpgHtf010-2.jpg is an example of a structural formula.
 

 11. 
An atom that contains 11 protons also contains 11 electrons.
 

 12. 
Matter is always solid.
 

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

 13. 
The type of bond that forms between sulfur and oxygen is
a.
covalent
c.
ionic
b.
none of these since the two atoms cannot combine.
d.
metallic
 

 14. 
Of the following, the strongest base would have a pH of
                                                                 
a.
7.
c.
3.  
b.
10. 
d.
6.
 

 15. 
The substances in a mixture can be separated by physical means because
a.
no chemical change occurs when the substances are combined.
c.
the physical and chemical properties of the substances change.
b.
the chemical, but not the physical, properties of the substances change.
d.
the physical, but not the chemical, properties of the substances change
 

 16. 
Which of the following is a correctly balanced chemical equation?
a.
KClOmc016-1.jpgmc016-2.jpgKCl+Omc016-3.jpg
c.
Ba(NOmc016-9.jpg)mc016-10.jpg + 2NaCl mc016-11.jpg BaClmc016-12.jpg+2NaNOmc016-13.jpg
b.
Hmc016-4.jpgOmc016-5.jpg mc016-6.jpg Hmc016-7.jpgO +Omc016-8.jpg
d.
K+Hmc016-14.jpgOmc016-15.jpg 2KOH + Hmc016-16.jpg
 

 17. 
The mathematical formula for density is
a.
D-v/m
c.
D=m x v
b.
D=m/v
d.
D- m + v
 

 18. 
The pH of acid rain is likely to be
           
a.
7.
c.
4.
b.
10.
d.
0.
 

 19. 
Which of the following has a definite volume, but not a definite shape?
a.
plasma
c.
gas
b.
solid
d.
liquid
 

 20. 
Which part of the atom is involved in chemical bonding.
a.
only the protons
c.
only the valence electrons.
b.
only the electrons
d.
only the nucleus
 

 21. 
As a result of an endothermic reaction
a.
the reactants and the products have the same amounts of energy.
c.
the reactants have more energy than the products.
b.
no energy change occurs.
d.
the products have more energy than the reactants.
 

 22. 
Rutherford’s experiment demonstrated that
a.
atoms are positively charged.
c.
Thomson’s atomic model was correct
b.
atoms are present in gold foil
d.
atoms are mostly empty space
 

 23. 
The smallest particle of a compound that retains the properties of the compound is called a(an)
a.
element
c.
atom
b.
molecule
d.
proton
 

 24. 
The products of any acid-base neutralization reaction always include
a.
hydrogen gas
c.
hydronium ions.
b.
water.
d.
hydroxide ions
 

 25. 
Valence electrons are found
a.
throughout the electron cloud.
c.
in the nucleus.
b.
in the energy level closest to the nucleus
d.
in the outermost energy level.
 

 26. 
The units used to measure density are
a.
newtons per kilogram
c.
milliliters
b.
cubic centimeters
d.
grams per milliliter
 

 27. 
A solution is a
a.
homogeneous mixture
c.
type of molecule
b.
heterogeneous mixture
d.
type of compound
 

 28. 
Acids react with active metals to produce  
a.
oxygen gas.
c.
different gases, depending on the acid.
b.
either hydrogen or oxygen gas.
d.
a. hydrogen gas.
 

 29. 
When two or more substances are combined, but each retains most of its properties, the resulting combination is called a(an)
a.
homogeneous substance
c.
mixture
b.
element
d.
compound
 

 30. 
According to Charles’s Law
a.
pressure of a gas increases if volume decreases
c.
volume of a gas increases if temperature increases
b.
pressure of a gas decreases if volume decreases
d.
volume of a gas decreases if temperature increases
 

 31. 
An atoms with an oxidation number of 2-
a.
has 2 valence electrons.
c.
has 6 valence electrons.
b.
will form an ion with a charge of 2+
d.
will form an ion with a charge of 6-
 

 32. 
Elements that have 5, 6, 7, or 8 electrons in their outermost energy level are
a.
metalloids
c.
alloys.
b.
metals
d.
nonmetals
 

 33. 
Carbon atoms
a.
form ionic bonds.
c.
form covalent bonds.
b.
never form bonds with other carbon atoms.
d.
 may form either covalent or ionic bonds.
 

 34. 
According to Boyle’s law, if the volume of a gas is decreased, the
a.
pressure of the gas will decrease
c.
particle collisions within the gas will increase
b.
temperature of the gas will increase
d.
particle collisions within the gas will decrease
 

 35. 
Atoms with a low ionization energy
a.
gain electrons easily.
c.
tend to form negative ions.
b.
lose electrons easily.
d.
tend to remain neutral.
 

 36. 
Which is not a characteristic of a metal?
a.
found on the far right of the periodic table
c.
malleable
b.
good conductor of heat and electricity
d.
ductile
 

 37. 
The formula for zinc iodide is ZnImc037-1.jpg.  What is the oxidation number of zinc in zinc iodide?
a.
2+
c.
1+
b.
2-
d.
1-
 

 38. 
The strong force
a.
causes the attraction between protons and electrons.
c.
causes different atoms to be attracted to each other.
b.
causes neutrons to change into protons and electrons.
d.
holds protons in the nucleus together
 

 39. 
According to the Thomson’s atomic model
a.
atoms consist of only negative electrical charges.
c.
Atoms consist of negatively charged electrons scattered among positive charges.
b.
atoms are either electrically positive or negative.
d.
atoms consist of only positive electrical charges.
 

 40. 
The electron was discovered by
a.
John Dalton
c.
Niels Bohr.
b.
J.J. Thomson
d.
Ernest Rutherford
 

 41. 
Which of the following is a metalloid?
a.
copper
c.
sodium
b.
silicon
d.
iron
 

 42. 
According to the Rutherford model of the atom, electrons are held in an atom
a.
scattered among the positive charges.
c.
by the attraction of the positively charged nucleus.
b.
in the nucleus
d.
by the attraction of the negatively charged nucleus.
 

 43. 
A catalyst is a
a.
products that speeds up the rate of a reaction
c.
reactant that speeds up the rate of a reaction.
b.
substance that lowers the activation energy needed for a reaction.
d.
substance that is changed as a result of a chemical reaction
 

 44. 
All acids contain the element
              
a.
chlorine
c.
hydrogen. 
b.
oxygen.    
d.
nitrogen
 

 45. 
A unit of mass is the
a.
kilometer
c.
liter
b.
newton
d.
gram
 

 46. 
In an exothermic reaction,
a.
some energy is destroyed.
c.
energy is stored in one or more of the products.
b.
energy is released.
d.
energy is taken from the surroundings.
 

 47. 
When particles in a closed container are heated, they
a.
move faster
c.
lose energy
b.
move closer together
d.
lose volume
 

 48. 
An ionic bond results from
a.
attractions between neutrally charged atoms.
c.
attractions between oppositely charged ions.
b.
attraction between ions having the same charge.
d.
the sharing of electrons.
 

 49. 
Which of the following is a correctly balanced equation describing a synthesis reaction?
a.
KClOmc049-1.jpgmc049-2.jpg KCl+Omc049-3.jpg
c.
Hmc049-8.jpgCOmc049-9.jpg mc049-10.jpg Hmc049-11.jpgO+COmc049-12.jpg
b.
3Fe+Omc049-4.jpgmc049-5.jpg Femc049-6.jpgOmc049-7.jpg
d.
2Hmc049-13.jpg+Omc049-14.jpgmc049-15.jpg 2Hmc049-16.jpgO
 

 50. 
Elements on the left side of the periodic table tend to be
a.
inactive solids
c.
inactive gases
b.
active solids
d.
active gases.
 

 51. 
An example of a chemical property is
a.
mass
c.
density
b.
the ability to rust
d.
color
 

 52. 
According to the chemical formula for ammonia, NHmc052-1.jpg, one molecule consists of
a.
1 nitrogen atom and 3 hydrogen atoms
c.
1 nitrogen atom and 1 hydrogen atom
b.
3 nitrogen atoms and 3 hydrogen atoms
d.
3 nitrogen atoms and 1 hydrogen atom
 

 53. 
The chemical reaction between an acid and a base is called
           
a.
neutralization
c.
emulsification
b.
ionization
d.
dissociation
 

 54. 
Mendeleev’s periodic table arranged all the known elements in order of
a.
decreasing valence.
c.
increasing atomic mass.
b.
increasing valence.
d.
decreasing atomic mass
 

 55. 
An example of a physical change is the
a.
process called photosynthesis
c.
shredding of a piece of paper
b.
change in the color of leaves in the autumn
d.
rust on a garden tool
 

 56. 
Which does not occur as a result of a chemical reaction?
a.
Molecules may be broken apart to become atoms.
c.
New atoms may form.
b.
Molecules may react with other molecules.
d.
Atoms may join with other atoms or molecules.
 

 57. 
In attempting to group elements, Mendeleev used their
a.
physical properties only
c.
physical and chemical properties
b.
melting point only.
d.
chemical properties only
 

 58. 
The weakest of the four forces governing the behavior of subatomic particles is
a.
weak force.
c.
electromagnetic force.
b.
gravity.
d.
strong force.
 

 59. 
Bohr’s atomic model placed the electrons
a.
in definite orbits around the nucleus.
c.
in the nucleus.
b.
in no definite position.
d.
scattered among the positive charges.
 

 60. 
An example of a chemical reaction is the
a.
freezing of ice
c.
drying of wet laundry
b.
shattering of a glass
d.
explosion of fireworks
 

 61. 
In general, increasing the concentration of reactants causes the reaction to occur
a.
faster
c.
by absorbing energy.
b.
by giving off energy.
d.
more slowly
 

 62. 
Which of the following represents a correctly balanced double - replacement reaction?
a.
Ba(NOmc062-1.jpg)mc062-2.jpg + Kmc062-3.jpgSO4mc062-4.jpgBaSOmc062-5.jpg + 2KNOmc062-6.jpg
c.
Zn+2HCl mc062-12.jpg  ZnClmc062-13.jpg + Hmc062-14.jpg
b.
Cmc062-7.jpgH8 + Omc062-8.jpgmc062-9.jpg   3COmc062-10.jpg + 4Hmc062-11.jpgO
d.
MgCOmc062-15.jpg +HCl mc062-16.jpg  MgClmc062-17.jpg + H2COmc062-18.jpg
 

 63. 
An example of a crystalline solid is
a.
table salt
c.
tar
b.
candle wax
d.
glass
 

 64. 
Dalton’s atomic theory was incorrect in stating that
a.
all elements are composed of atoms.
c.
atoms are indivisible.
b.
atoms of different elements are different.
d.
compounds form when atoms join together.
 

 65. 
When an atom loses electrons, it
a.
obtains a neutral charge
c.
becomes negatively charged.
b.
becomes positively charged.
d.
will form a metallic bond.
 

 66. 
Elements on the right side of the periodic table tend to be
a.
active gases.
c.
active solids
b.
inactive solids
d.
inactive gases
 

 67. 
In a structural formula, each dash (—) represents a(an)
           
a.
electron
c.
bond between 2 carbon atoms.
b.
negative charge.
d.
pair of electrons.
 

 68. 
Sharing of electrons occurs in
a.
covalent bonding
c.
the formation of ions
b.
ionic bonding.
d.
metallic bonding
 

 69. 
When substances go directly from the solid phase to the gas phase, the phase change is called
a.
vaporization
c.
condensation
b.
evaporation
d.
sublimation
 

 70. 
Structural formulas have an advantage over molecular formulas because they show the
           
a.
number of atoms of each element present.
c.
bonding capacity of each carbon atom.
b.
percent composition of the compound.
d.
geometric arrangement of the atoms.
 

 71. 
The noble gases are inactive because
a.
their outermost energy levels are complete.
c.
they are all low-density gases.
b.
they all have 6 valence electrons.
d.
they are nonmetals.
 

 72. 
Which of the following gives the correct symbols and formulas
a.
Mg + Omc072-1.jpg = MgOmc072-2.jpg mc072-3.jpg energy
c.
Mg + Omc072-5.jpg = MgO + energy
b.
Mg + O = MgOmc072-4.jpg + energy
d.
Mg + Omc072-6.jpg = MgO mc072-7.jpg energy
 

 73. 
A substance that dissolves in water is
a.
soluble
c.
a colloid
b.
insoluble
d.
a solvent
 

 74. 
Which of the following is a correctly balanced equation describing a decomposition reaction?
a.
Femc074-1.jpgOmc074-2.jpgmc074-3.jpg 2Fe+Omc074-4.jpg
c.
Cu+AgNOmc074-10.jpgmc074-11.jpg CuNOmc074-12.jpg+Ag
b.
Hmc074-5.jpgCOmc074-6.jpgmc074-7.jpg Hmc074-8.jpgO+COmc074-9.jpg
d.
KClOmc074-13.jpgmc074-14.jpg KCl+Omc074-15.jpg
 

 75. 
In chemical combinations, nonmetals tend to
a.
gain, lose, or share 4 electrons.
c.
lose electrons
b.
gain electrons
d.
gain, lose, or share 1 electron
 

 76. 
The chemical equation Hmc076-1.jpg+Omc076-2.jpgmc076-3.jpg  Hmc076-4.jpgO is not balanced because
a.
the same numbers and kinds of molecules are not present on both sides of the equation
c.
the same substances do not appear on both sides of the equation
b.
hydrogen and oxygen are destroyed
d.
the same numbers and kinds of atoms are not present on both sides of the equation.
 

 77. 
Which is not the correct symbol for the element?
a.
Ca-calcium
c.
Cr-chromium
b.
C-carbon
d.
CO-cobalt
 

 78. 
Democritus concluded that matter
a.
is positively charged.
c.
could be divided into smaller and smaller pieces forever.
b.
consists of protons, neutrons and electrons.
d.
could be divided into indivisible atoms.
 

 79. 
Which is true for all the members of the halogen family?
a.
They may be found free, or chemically uncombined, in nature.
c.
They are all metals.
b.
They have 7 valence electrons.
d.
They are very inactive.
 

 80. 
Which of the following is a correctly balanced chemical equation?
a.
Cu+Omc080-1.jpg Cumc080-2.jpgO
c.
Zn+2AgNOmc080-7.jpgmc080-8.jpg Zn(NOmc080-9.jpg)mc080-10.jpg
b.
Nmc080-3.jpg+3Hmc080-4.jpgmc080-5.jpg NHmc080-6.jpg
d.
2Hmc080-11.jpg+Omc080-12.jpgmc080-13.jpg 2Hmc080-14.jpgO
 

 81. 
The mass of your science textbook is approximately
a.
1600 kg.
c.
160 g.
b.
1600 g.
d.
160 kg.
 

 82. 
Mendeleev’s original periodic table of the elements contained many “missing” elements. Using his periodic table, he was able to
a.
form the missing elements as a result of chemical reactions
c.
change the location of the missing elements so there would be no blank spaces.
b.
correctly predict the properties of the missing elements
d.
find the missing elements.
 

 83. 
An example of a substance that sublimes is
a.
dry ice
c.
ice water
b.
ice cream
d.
regular ice
 

 84. 
The formation of a chemical bond involves
a.
only the electrons.
c.
only the protons.
b.
protons and electrons.
d.
electrons and neutrons.
 



 
Check Your Work     Start Over