GENERAL CHEMISTRY CHAPTER 1 TO 24
PRACTICE TEST 2026 FULL SOLUTIONS
REVIEW PACK
◉ What are examples of Physical Properties of Matter?
Answer: Odor, taste, color, appearance, melting point, boiling point,
and density.
◉ What are Chemical Properties of Matter?
Answer: Properties that a substance displays only by changing its
composition via a chemical change.
◉ What are examples of Chemical Properties of Matter?
Answer: Corrosiveness, flammability, acidity, toxicity, and other such
characteristics.
◉ What are Physical Changes in Matter?
Answer: Changes that alter only state or appearance, but not
composition. These are easily reversable.
◉ What is an example of a physical change in matter?
,Answer: When water boils, its state is changed from a liquid to a gas,
but the gas is still made of water molecules, so the chemical identity
(composition) is not changed.
◉ What are Chemical Changes in Matter?
Answer: Changes that alter the composition of matter. These require
chemical reactions to reverse them.
◉ What is an example of a chemical change in matter?
Answer: When iron rusts, the iron atoms combine with oxygen
atoms to form a different chemical substance, the compound iron
oxide, so its chemical identity (composition) is changed.
◉ What three compositions can Matter be classified by?
Answer: Elements, Compounds, Mixtures
◉ What is a pure substance?
Answer: Something made up of only one component, and its
composition is invariant (it does not vary from one sample to
another).
◉ What are examples of pure substances?
,Answer: Helium, water, and sodium chloride; helium is made up of
ONLY helium atoms, water is made up of ONLY water molecules, and
sodium chloride is made up ONLY of sodium chloride units.
◉ What is a mixture?
Answer: Something composed of two or more components in
proportions that can vary from one sample to another.
◉ What is an example of a mixture?
Answer: Sweetened tea, composed primarily of BOTH water
molecules and sugar molecules; it is not made up ONLY of one or the
other.
◉ Pure substances can be classified into what two types?
Answer: Elements, Compounds
◉ What is an element?
Answer: A substance that cannot be chemically broken down into
simpler substances (composed of a single type of atom, like Helium).
◉ What is a compound?
Answer: A substance composed of two or more elements in a fixed,
definite proportion, like hydrogen and oxygen comprising water.
, ◉ Mixtures can be categorized into what two types?
Answer: Heterogeneous, Homogeneous
◉ What does it mean if a mixture is heterogeneous?
Answer: The composition varies from one region of the mixture to
another, like different letters spread out in an alphabet soup; there
are multiple substances whose presence can be seen.
◉ What does it mean if a mixture is homogeneous?
Answer: The composition stays the same (uniform) throughout all
regions of the mixture, like how sweet tea should taste the same
throughout a whole glass; made of multiple substances but appears
to be one substance.
◉ What are qualitative observations?
Answer: Observations that are descriptive in nature, not involving
numbers.
◉ What are quantitative observations?
Answer: Observations that involve measurements (numbers).
◉ What is accuracy?
Answer: How close the measured value is to the actual value.
PRACTICE TEST 2026 FULL SOLUTIONS
REVIEW PACK
◉ What are examples of Physical Properties of Matter?
Answer: Odor, taste, color, appearance, melting point, boiling point,
and density.
◉ What are Chemical Properties of Matter?
Answer: Properties that a substance displays only by changing its
composition via a chemical change.
◉ What are examples of Chemical Properties of Matter?
Answer: Corrosiveness, flammability, acidity, toxicity, and other such
characteristics.
◉ What are Physical Changes in Matter?
Answer: Changes that alter only state or appearance, but not
composition. These are easily reversable.
◉ What is an example of a physical change in matter?
,Answer: When water boils, its state is changed from a liquid to a gas,
but the gas is still made of water molecules, so the chemical identity
(composition) is not changed.
◉ What are Chemical Changes in Matter?
Answer: Changes that alter the composition of matter. These require
chemical reactions to reverse them.
◉ What is an example of a chemical change in matter?
Answer: When iron rusts, the iron atoms combine with oxygen
atoms to form a different chemical substance, the compound iron
oxide, so its chemical identity (composition) is changed.
◉ What three compositions can Matter be classified by?
Answer: Elements, Compounds, Mixtures
◉ What is a pure substance?
Answer: Something made up of only one component, and its
composition is invariant (it does not vary from one sample to
another).
◉ What are examples of pure substances?
,Answer: Helium, water, and sodium chloride; helium is made up of
ONLY helium atoms, water is made up of ONLY water molecules, and
sodium chloride is made up ONLY of sodium chloride units.
◉ What is a mixture?
Answer: Something composed of two or more components in
proportions that can vary from one sample to another.
◉ What is an example of a mixture?
Answer: Sweetened tea, composed primarily of BOTH water
molecules and sugar molecules; it is not made up ONLY of one or the
other.
◉ Pure substances can be classified into what two types?
Answer: Elements, Compounds
◉ What is an element?
Answer: A substance that cannot be chemically broken down into
simpler substances (composed of a single type of atom, like Helium).
◉ What is a compound?
Answer: A substance composed of two or more elements in a fixed,
definite proportion, like hydrogen and oxygen comprising water.
, ◉ Mixtures can be categorized into what two types?
Answer: Heterogeneous, Homogeneous
◉ What does it mean if a mixture is heterogeneous?
Answer: The composition varies from one region of the mixture to
another, like different letters spread out in an alphabet soup; there
are multiple substances whose presence can be seen.
◉ What does it mean if a mixture is homogeneous?
Answer: The composition stays the same (uniform) throughout all
regions of the mixture, like how sweet tea should taste the same
throughout a whole glass; made of multiple substances but appears
to be one substance.
◉ What are qualitative observations?
Answer: Observations that are descriptive in nature, not involving
numbers.
◉ What are quantitative observations?
Answer: Observations that involve measurements (numbers).
◉ What is accuracy?
Answer: How close the measured value is to the actual value.
