Focus On Physical Science: California Grade 8

Lesson 1: Chemistry of Life

Standards Check

1.
Which of these is a form of energy? 6.b
A)snails
B)heat
C)atoms
D)air
2.
__________ is probably the most important inorganic compound for organisms. 6.c
A)A carbohydrate
B)Sodium bicarbonate
C)Water
D)A lipid
3.
The bodies of most organisms are 50 percent to 95 percent ________. 6.c
A)air
B)energy
C)sugar
D)water
4.
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
5.
How long have the carbon atoms in your body been on Earth? 6.b
A)probably less than one year
B)as long as you have been alive
C)billions of years
D)15 minutes
6.
What cycle of matter involves carbon dioxide in Earth's atmosphere? 6.b
A)nitrogen
B)carbon
C)water
D)oxygen
7.
Water is a/an __________. 6.c
A)compound
B)element
C)enzyme
D)lipid
8.
Nonpolar molecules do not have __________. 6.c
A)covalent bonds
B)triple bonds
C)unbalanced charges
D)double bonds
9.
A(n) __________ is a bond in which electrons are shared unequally. 6.c
A)intermediate
B)ionic
C)nonpolar
D)polar bond
Grade 8
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