Chem 102 Exam

Chemistry is defined as the study of composition and structure of materials and

• the categories of matter

• the changes in matter

• the electrical currents in matter

• molecules in living things

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Chemistry is the study of all of the following EXCEPT

• matter

• changes in matter

• energy associated with changes in matter

• projectile motion

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The branch of chemistry concerned with the properties, changes, and relationships between energy and matter is

• inorganic chemistry

• analytical chemistry

• physical chemistry

• theoretical chemistry

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The melting of candle wax is classified as a physical change because it

• produces no new substances

• transfers energy

• absorbs heat

• changes the chemical properties of wax

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physical means can be used to separate

• elements

• pure substances

• mixtures

• compounds

based on their location in the figure above, oxygen and selenium have

• the same number of neutrons

• the same conductivity

• similar properties

• the same number of electron orbitals

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The elements that border the zigzag line in the periodic table are

• inactive

• metals

• metalloids

• nonmetals

which statement is NOT true about nonmetals?

• they have characteristics of both metals and nonmetals

• many are gases at room temperature

• they have low conductivity

• there are fewer nonmetals than metals

A plausible explanation of a body of observed natural phenomena is a scientific

• principle

• experiment

• law

• theory

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A theory is an accepted explanation of an observed phenomenon until

• one study conflicts with the theory

• repeated data and observation conflict with the theory

• scientists disagree about the methods used to gather the data

• en eminent scientist declares that it is inadequate