Download Student Name: Period#: ______ Mrs. Lee – 8th Grade Physical

Student Name: ______________________________________
Mrs. Lee – 8th Grade Physical Science
Period#: ______
Page 1
Chapter 8 Practice Test
______
1) A chemical bond is ______.
a) a way of organizing elements in the periodic table
b) the force that holds two atoms together
c) how elements react with each other
d) a result of combustion
______
2) The ways in which an atom can bond with other atoms depends on the atom’s
______.
a) valence electrons b) nucleus
c) atomic number
d) atomic mass
______
3) The most loosely held electrons in an atom are ______.
a) unstable electrons
b) covalent electrons
c) valence electrons
d) low-energy electrons
______
4) The maximum number of bonds a carbon atom can form is ______.
a) one
b) two
c) three
d) four
______
5) Many organic compounds ______.
a) have high melting points
b) have high boiling points
c) do not dissolve well in water
d) conduct electricity
______
6) The monomers of complex carbohydrates are ______.
a) simple sugars
b) amino acids
c) fatty acids
d) glycerol
______
7) Pure carbon exists as all the following forms EXCEPT ______.
a) graphite
b) methane
c) fullerene d) diamond
______
8) Carbohydrates are made up of carbon, hydrogen, and ______.
a) sulfur
b) nitrogen
c) phosphorus
d) oxygen
______
9) The names of saturated hydrocarbons end in ______.
a) –ane
b) –ine
c) –ene
d) –yne
______
10) Substituted hydrocarbons include all of the following EXCEPT ______.
a) alcohols
b) halogen-containing compounds
c) minerals
d) organic acids
______
11) Which of the following is a natural composite?
a) wood
b) fiberglass c) cellulose d) nylon
______
12) The main classes of organic compounds in living things include all of the
following EXCEPT ______.
a) carbohydrates
b) proteins
c) alcohols
d) lipids
______
13) Carbon atoms can form straight chains, branched chains, and rings.
a) True
b) False
Ch 8 Practice Test
1
Student Name: ______________________________________
Mrs. Lee – 8th Grade Physical Science
Period#: ______
Page 2
Chapter 8 Practice Test
______
14) Many fullerenes have pleasant, fruity smells.
a) True
b) False
______
15) Along with carbohydrates, lipids, and proteins, vitamins and minerals are other
nutrients that contribute to a healthy diet.
a) True
b) False
______
16) A combination of an oxygen atom and a hydrogen atom, -OH, is called a
hydrocarbon.
a) True
b) False
______
17) Nucleotides are polymers made of amino acids.
a) True
b) False
______
18) A hydrocarbon with only single bonds in its carbon chain is called an unsaturated
hydrocarbon.
a) True
b) False
______
19) Fats and oils are energy-rich organic compounds called lipids.
a) True
b) False
______
20) A composite is a material that combines the useful properties of two or more
substances.
a) True
b) False
______
21) DNA and RNA are examples of cholesterol.
a) True
b) False
______
22) A pure form of carbon that forms a very hard crystal is ______.
a) diamond b) graphite
c) fullerene
______
23) All hydrocarbons
a) burn easily
b) have carboxyl groups
c) have fruity smells
______
24) In a substituted hydrocarbon, an atom of another element replaces a(n) ______.
a) carbon atom
b) oxygen atom
c) hydrogen atom
______
25) Proteins are polymers formed from monomers called ______.
a) esters
b) carbohydrates
c) amino acids
______
26) Synthetic polymers that can be molded or shaped are ______.
a) cellulose b) plastics
c) isomers
Ch 8 Practice Test
2
Student Name: ______________________________________
Mrs. Lee – 8th Grade Physical Science
Period#: ______
Page 3
Chapter 8 Practice Test
______
27) Carbohydrates give your body ______.
a) the building blocks to repair body parts
b) helper molecules for chemical reactions in your body
c) energy
______
28) The building blocks of proteins are ______.
a) amino acids
b) nucleic acids
c) fatty acids
______
29) Which food is a source of fat?
a) potatoes
b) rice
c) butter
______
30) A form of pure carbon in which carbon atoms are arranged in the shape of a long,
hollow tube is a fullerene.
a) True
b) False
______
31) Compounds with the same chemical formula but different structural formulas are
called isomers.
a) True
b) False
______
32) Two or more substances combined in a new material with different properties is a
DNA.
a) True
b) False
______
33) Starch is a complex carbohydrate made up of molecules of fatty acids.
a) True
b) False
______
34) Carbon atoms cannot form chemical bonds with other carbon atoms.
a) True
b) False
______
35) Hydrocarbons are organic compounds that contain only the elements hydrogen
and carbon.
a) True
b) False
______
36) Polymers are very large molecules made of monomers.
a) True
b) False
______
37) Carbohydrates release much more energy in your body than do lipids.
a) True
b) False
______
38) The order of nucleotides in a DNA molecule determines the differences among
living things.
a) True
b) False
Ch 8 Practice Test
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Student Name: ______________________________________
Mrs. Lee – 8th Grade Physical Science
Period#: ______
Page 4
Chapter 8 Practice Test
Use the diagrams below to answer the following 3 questions:
______
39) Interpreting Diagrams: Which is a branched hydrocarbon chain?
a) compound A
b) compound B
c) neither compound is a branched chain
______
40) Applying Concepts: What kind of formula is used above to show the
compounds?
a) chemical formula b) structural formula c) chemical equation
______
41) Applying Concepts: Which formula correctly describes both compounds above?
a) C4H10
b) C3H7
c) CH4
Use the diagrams below to answer the following 2 questions:
______
42) Classifying: What kind of substituted hydrocarbon is compound A?
a) alcohol
b) organic acid
c) halogen-containing compound
______
43) Applying Concepts: Which is the correct formula for compound B?
a) C4H
b) CH3Cl
c) CCl4
Ch 8 Practice Test
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