CHEM 120 UNIT 8 FINAL EXAM REVIEW PAPER
2026 FULL SOLUTION GRADED A+
◉ 1 km=. Answer: 1000m
◉ Milli. Answer: 10^-3
◉ Micro. Answer: 10^-6
◉ Nano. Answer: 10^-9
◉ Solid. Answer: molecules closely spaced and although they vibrate
about a fixed point, they do not generally move relative to one
another, incompressible
◉ Liquid. Answer: molecules are closely spaced out but free to move
around and past each other (takes up the shape of the container
◉ Gas. Answer: molecules are separated by large distances and do
not interact significantly with one another
, ◉ Pure Substance. Answer: composed of only one type of atom or
molecule
◉ Element. Answer: a pure substance that cannot be broken down
into simpler substances
◉ Compound. Answer: a pure substance composed of two or more
elements in fixed definite proportions
◉ Mixture. Answer: composed of two or more different types of
atoms or molecules combined in variable proportions
◉ Homogenous Mixture. Answer: composition is the same
throughout
◉ Heterogeneous Mixture. Answer: composition varies from one
region to another
◉ Physical Change. Answer: one that a substance displays without
changing its composition. The atomic/molecular composition of the
substance does not change
◉ Chemical Change. Answer: one that a substance displays only
though changing its composition
2026 FULL SOLUTION GRADED A+
◉ 1 km=. Answer: 1000m
◉ Milli. Answer: 10^-3
◉ Micro. Answer: 10^-6
◉ Nano. Answer: 10^-9
◉ Solid. Answer: molecules closely spaced and although they vibrate
about a fixed point, they do not generally move relative to one
another, incompressible
◉ Liquid. Answer: molecules are closely spaced out but free to move
around and past each other (takes up the shape of the container
◉ Gas. Answer: molecules are separated by large distances and do
not interact significantly with one another
, ◉ Pure Substance. Answer: composed of only one type of atom or
molecule
◉ Element. Answer: a pure substance that cannot be broken down
into simpler substances
◉ Compound. Answer: a pure substance composed of two or more
elements in fixed definite proportions
◉ Mixture. Answer: composed of two or more different types of
atoms or molecules combined in variable proportions
◉ Homogenous Mixture. Answer: composition is the same
throughout
◉ Heterogeneous Mixture. Answer: composition varies from one
region to another
◉ Physical Change. Answer: one that a substance displays without
changing its composition. The atomic/molecular composition of the
substance does not change
◉ Chemical Change. Answer: one that a substance displays only
though changing its composition
