ATI TEAS 7 CHEMISTRY
STUDY GUIDE | KEY
CONCEPTS + PRACTICE
QUESTIONS | 2024–
2025 EDITION
Matter Anything that has mass and takes up space.
Mass the quantity/measure of the amount of matter in an object.
Volume amount of space an object takes up.
How can you determine if matter It can be determined by how far apart the molecules are and how
is solid, liquid, and gas? fast the molecules are moving.
Solid fixed shape and volume
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10
, Liquid fixed volume, no fixed shape
Gas neither definite volume nor definite shape
Solid to Liquid melting
Liquid to Solid Freezing
Solid to Gas sublimation
Gas to Solid deposition
Gas to Liquid condensation
Liquid to Gas vaporization/evaporation
As temperature increases, decreases
atmospheric pressure
As temperature decreases, increases
atmospheric pressure
Molecules absorb heat energy,
increasing the temperature. This
In a heating curve,
decreases cohesion, causing
molecules to spread apart.
Molecules release energy, decreasing
the temperature. This increases cohesion,
In a cooling curve,
causing molecules to come closer
together.
A sample of matter, either a single element or a single compound,
Pure Substance
that has definite chemical and physical properties.
Material composed of two or more
elements or compounds that are
Mixture
physically mixed together but not
chemically combined.
A pure substance made of only one kind of atom.
Element
A substance made up of atoms of two or
more different elements joined by
Compound
chemical bonds.
Composition varies, no distinct
boundaries. Ex. Salt and water.
Homogenous Mixture
Distinct boundaries and composition
varies. Ex. Oil and water.
Heterozygous Mixture
Subatomic Particles protons, neutrons, electrons
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10
STUDY GUIDE | KEY
CONCEPTS + PRACTICE
QUESTIONS | 2024–
2025 EDITION
Matter Anything that has mass and takes up space.
Mass the quantity/measure of the amount of matter in an object.
Volume amount of space an object takes up.
How can you determine if matter It can be determined by how far apart the molecules are and how
is solid, liquid, and gas? fast the molecules are moving.
Solid fixed shape and volume
1/
10
, Liquid fixed volume, no fixed shape
Gas neither definite volume nor definite shape
Solid to Liquid melting
Liquid to Solid Freezing
Solid to Gas sublimation
Gas to Solid deposition
Gas to Liquid condensation
Liquid to Gas vaporization/evaporation
As temperature increases, decreases
atmospheric pressure
As temperature decreases, increases
atmospheric pressure
Molecules absorb heat energy,
increasing the temperature. This
In a heating curve,
decreases cohesion, causing
molecules to spread apart.
Molecules release energy, decreasing
the temperature. This increases cohesion,
In a cooling curve,
causing molecules to come closer
together.
A sample of matter, either a single element or a single compound,
Pure Substance
that has definite chemical and physical properties.
Material composed of two or more
elements or compounds that are
Mixture
physically mixed together but not
chemically combined.
A pure substance made of only one kind of atom.
Element
A substance made up of atoms of two or
more different elements joined by
Compound
chemical bonds.
Composition varies, no distinct
boundaries. Ex. Salt and water.
Homogenous Mixture
Distinct boundaries and composition
varies. Ex. Oil and water.
Heterozygous Mixture
Subatomic Particles protons, neutrons, electrons
2/
10
