volume is the amount of three dimensional space an object occupies. mass is a measure of the amount...
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• Volume is the amount of three dimensional space an object occupies.
• Mass is a measure of the amount of matter.
• Matter is anything that has mass and takes up space.
Matter
Section 2 Matter and Its PropertiesChapter 1
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Visual Concept
Chapter 1
Matter
Section 2 Matter and Its Properties
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Basic Building Blocks of Matter• An atom is the smallest unit of an element that
maintains the chemical identity of that element.
• An element is a pure substance that cannot be broken down into simpler, stable substances and is made of one type of atom.
• A compound is a substance that can be broken down into simple stable substances. Each compound is made from the atoms of two or more elements that are chemically bonded.
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Chapter 1
Atom
Section 2 Matter and Its Properties
Visual Concept
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Visual Concept
Chapter 1
Element
Section 2 Matter and Its Properties
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Visual Concept
Chapter 1
Molecule
Section 2 Matter and Its Properties
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Visual Concept
Chapter 1
Compounds
Section 2 Matter and Its Properties
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Physical Properties and Physical Changes
• A physical property is a characteristic that can be observed or measured without changing the identity of the substance.
• melting point and boiling point
• A physical change is a change in a substance that does not involve a change in the identity of the substance.
• grinding, cutting, melting, and boiling
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Physical Properties and Physical Changes, continued• A change of state is a physical change of a
substance from one state to another.
• states of matter—solid state, liquid state, gas state, plasma
• In the solid state, matter has definite volume and definite shape.
• In the liquid state, matter has a definite volume but an indefinite shape.
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• In the gas state, matter has neither definite volume nor definite shape.
• Plasma is a high-temperature physical state of matter in which atoms lose most of their electrons, particles that make up atoms.
Physical Properties and Physical Changes, continued
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Chapter 1
Liquid
Section 2 Matter and Its Properties
Visual Concept
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Chapter 1
Gas
Section 2 Matter and Its Properties
Visual Concept
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Chemical Properties and Chemical Changes
• A chemical property relates to a substance’s ability
to undergo changes that transform it into different
substances
• A change in which one or more substances are
converted into different substances is called a
chemical change or chemical reaction.
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Chapter 1
Chemical Reaction
Section 2 Matter and Its Properties
Visual Concept
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Chemical Properties and Chemical Changes, continued
• The products are the substances that are formed by
the chemical change.
Section 2 Matter and Its PropertiesChapter 1
reactants product
• The reactants are the substances that react in a
chemical change.
Carbon plus oxygen yields (or forms) carbon dioxide.
carbon + oxygen carbon dioxide
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Evidence of a Chemical Change
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Energy and Changes in Matter• Energy is always involved when physical or chemical
changes occur.
• Energy can be in various forms.• heat • light
• Energy can be absorbed or released in a change, it is
not destroyed or created.• law of conservation of energy
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Visual Concept
Chapter 1
Classification Scheme for Matter
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Classification of Matter
• A mixture is a blend of two or more kinds of matter,
each of which retains its own identity and properties. • mixed together physically• can usually be separated
• Homogeneous mixtures are called solutions • uniform in composition (salt-water solution)
• Heterogeneous mixtures• not uniform throughout (clay-water mixture)
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Pure Substances
• A pure substance has a fixed composition.
• Pure substances are either compounds or elements.
• A pure substance differs from a mixture in the following ways:
• Every sample of a given pure substance has exactly the same characteristic properties.
• Every sample of a given pure substance has exactly the same composition.
• Water is always 11.2% hydrogen and 88.8% oxygen by mass.
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