CHEM120 INTRODUCTION GENERAL
ORGANIC BIOLOGICAL CHEMISTRY
REVIEW PRACTICE SOLUTION SET 2026
TESTED QUESTIONS WITH VERIFIED
ANSWERS GRADE A
◉ Matter Answer: Anything that has mass and takes up space.
◉ Solid Answer: Has fixed shape and fixed volume. Particles are packed
tightly.
◉ Liquid Answer: Has fixed volume but takes the shape of its container.
◉ Gas Answer: Has no fixed shape or volume. Particles move freely and
spread out.
◉ Plasma Answer: Ionized gas with very high energy.
◉ Translational motion Answer: Particles move from one place to
another.
◉ Rotational motion Answer: Particles spin around.
◉ Vibrational motion Answer: Particles vibrate in place.
, ◉ Physical property Answer: A property you can observe or measure
without changing the substance. Example: color, density.
◉ Chemical property Answer: Describes how a substance reacts or
changes into a new substance. Example: flammability.
◉ Physical change Answer: Change where the substance stays the same.
Example: melting ice.
◉ Chemical change Answer: Change where a new substance forms.
Example: burning methane.
◉ Reactant Answer: Starting material in a chemical reaction.
◉ Product Answer: Substance formed in a chemical reaction.
◉ Exothermic reaction Answer: Releases heat energy.
◉ Endothermic reaction Answer: Absorbs heat energy.
◉ Pure substance Answer: Matter made of only one type of substance.
◉ Element Answer: Pure substance made of one type of atom.
ORGANIC BIOLOGICAL CHEMISTRY
REVIEW PRACTICE SOLUTION SET 2026
TESTED QUESTIONS WITH VERIFIED
ANSWERS GRADE A
◉ Matter Answer: Anything that has mass and takes up space.
◉ Solid Answer: Has fixed shape and fixed volume. Particles are packed
tightly.
◉ Liquid Answer: Has fixed volume but takes the shape of its container.
◉ Gas Answer: Has no fixed shape or volume. Particles move freely and
spread out.
◉ Plasma Answer: Ionized gas with very high energy.
◉ Translational motion Answer: Particles move from one place to
another.
◉ Rotational motion Answer: Particles spin around.
◉ Vibrational motion Answer: Particles vibrate in place.
, ◉ Physical property Answer: A property you can observe or measure
without changing the substance. Example: color, density.
◉ Chemical property Answer: Describes how a substance reacts or
changes into a new substance. Example: flammability.
◉ Physical change Answer: Change where the substance stays the same.
Example: melting ice.
◉ Chemical change Answer: Change where a new substance forms.
Example: burning methane.
◉ Reactant Answer: Starting material in a chemical reaction.
◉ Product Answer: Substance formed in a chemical reaction.
◉ Exothermic reaction Answer: Releases heat energy.
◉ Endothermic reaction Answer: Absorbs heat energy.
◉ Pure substance Answer: Matter made of only one type of substance.
◉ Element Answer: Pure substance made of one type of atom.
