Focus On Physical Science: California Grade 8

Chapter 10: Chemistry of Living Systems

Standard Assessment

1.
How long have the carbon atoms in your body been on Earth? 6.b
A)as long as you have been alive
B)billions of years
C)probably less than one year
D)15 minutes
2.
__________ is probably the most important inorganic compound for organisms. 6.c
A)A carbohydrate
B)Sodium bicarbonate
C)Water
D)A lipid
3.
Which of these is a form of energy? 6.b
A)air
B)snails
C)atoms
D)heat
4.
The bodies of most organisms are 50 percent to 95 percent ________. 6.c
A)air
B)energy
C)sugar
D)water
5.
Which of these can form when carbon bonds? 6.a
A)rings
B)double bonds
C)branched chains
D)all of the above
6.
Genetic material is found in which organic compound? 6.c
A)sodium bicarbonate
B)nucleic acid
C)proteins
D)carbohydrates
7.
A simple hydrocarbon contains molecules of ______ and ______. 6.a
A)hydrogen, carbon
B)hydrogen, chlorine
C)carbon, nitrogen
D)carbon, helium
8.
Nonpolar molecules do not have __________. 6.c
A)triple bonds
B)unbalanced charges
C)covalent bonds
D)double bonds
9.
Saturated hydrocarbons contain ______ covalent bonds. 6.a
A)triple
B)double
C)single
D)four
10.
How do decomposers obtain energy in an ecosystem? 6.b
A)from the atmosphere
B)through photosynthesis
C)through symbiosis
D)from breaking down dead organisms
11.
Which suffix ending is given to compounds in which carbon atoms are joined by double bonds? 6.a
A)yne
B)ane
C)ene
D)ine
12.
A(n) __________ is a bond in which electrons are shared unequally. 6.c
A)ionic
B)polar bond
C)nonpolar
D)intermediate
13.
Water is a/an __________. 6.c
A)element
B)compound
C)enzyme
D)lipid
14.
Which organic compound is used by cells to store and release energy? 6.c
A)proteins
B)lipids
C)carbohydrates
D)nucleic acids
15.
Saturated fats are _____. 6.c
A)nucleic acids
B)carbohydrates
C)proteins
D)lipids
16.
What cycle of matter involves carbon dioxide in Earth's atmosphere? 6.b
A)oxygen
B)nitrogen
C)water
D)carbon
17.
Which of these is an inorganic compound? 6.c
A)fats
B)sugars
C)hydrochloric acid
D)phospholipids
18.
Which of these is an organic compound? 6.c
A)water
B)lipids
C)calcium phosphate
D)potassium chloride
19.
Which group contains a covalently bonded hydrogen and oxygen atom? 6.b
A)amino
B)carboxyl
C)hydroxyl
D)protein
Grade 8
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