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Pre-Test
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1
Which of the following elements is NOT one of the six that make up 98% of most organisms' body weight?
A)hydrogen
B)nitrogen
C)carbon
D)iron
2
Which of the following statements is true?
A)All isotopes give off subatomic particles.
B)All isotopes are radioactive.
C)All isotopes have the same number of protons.
D)All isotopes have the same number of neutrons.
3
What type of bond is formed when atoms share electrons?
A)ionic
B)covalent
C)hydrogen
4
Which of the following has a basic pH?
A)lemon juice
B)milk of magnesia
C)tomatoes
D)hydrochloric acid
5
Aquatic living things are able to survive the winter thanks to which property of water?
A)It is less dense as a solid than as a liquid.
B)It is cohesive and adhesive.
C)It is the universal solvent.
D)It resists changes of state (from liquid to ice or liquid to steam).





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