Chapter 1 Molecular Reasons. What Is Chemistry? The science that deals with the materials of the...
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Transcript of Chapter 1 Molecular Reasons. What Is Chemistry? The science that deals with the materials of the...
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Chapter 1
Molecular Reasons
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What Is Chemistry? The science that deals with the materials
of the universe and the changes these materials undergo.
The science that seeks to understand what matter does by studying what atoms and molecules do.
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What Is Chemistry? Everything is made of tiny pieces called
atoms and molecules.
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Scientific Method A process for trying to understand nature
by observing nature and the way it behaves, and by conducting experiments to test our ideas.
Key characteristics of the scientific method include Observation, formulation of Hypotheses, Experimentation, and formulation of Laws and Theories.
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Scientific Method
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Scientific Method
Applies to single or small
number of events
Applies to all events
Describes what happens observation law
Explains why things happen hypothesis theory
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Matter Matter is defined as anything that
occupies space and has mass–things you can see, touch, taste, or smell. Matter is neither created nor destroyed in a
chemical reaction.
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States of Matter Matter can be
classified as solid, liquid, or gas based on what properties it exhibits.
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Composition of Matter Matter that is composed of only one kind
of atom or molecule is called a pure substance.
Matter that is composed of different kinds of atoms or molecules is called a mixture.
Pure SubstanceConstant Composition
MixtureVariable Composition
Matter
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Composition of Matter Pure substance
Element—a substance that cannot be broken down into other substances by chemical methods.
Compound—a substance composed of a given combination of elements that can be broken down into those elements by chemical methods.
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Composition of Matter Element: made of one
type of atom. Compound: made of
one type of molecule, or array of ions—more than one type of atom.
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Composition of Matter Mixture
Mixtures that are uniform throughout are called homogeneous. Also known as solutions.
Mixtures that have regions with different characteristics are called heterogeneous.
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Composition of Matter
Homogeneous—appears to be one substance, all portions of a sample have the same composition and properties.
Heterogeneous—presence of multiple substances can be seen, portions of a sample have different composition and properties.
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Composition of Matter
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Composition of Matter Classify each of the following as a pure
substance (compound or element) or mixture (homogeneous or heterogeneous). Pure water Gasoline Jar of jelly beans Soil Copper metal
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Physical and Chemical Properties Physical Properties are the
characteristics of matter that can be changed without changing its composition. Characteristics that are directly observable.
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Physical and Chemical Properties Chemical Properties are the
characteristics that determine how the composition of matter changes as a result of contact with other matter or the influence of energy. Characteristics that describe the behavior of
matter.
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Physical and Chemical Properties Classify each of the following as a physical
or chemical property. Ethyl alcohol boils at 78oC Sugar ferments to form ethyl alcohol Salt is stable at room temperature, it does not
decompose 36 g of salt will dissolve in 100 g of water
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Physical and Chemical Changes Changes that alter the
state or appearance of the matter without altering the composition are called physical changes.
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Physical and Chemical Changes Changes that alter the
composition of the matter are called chemical changes.
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Physical and Chemical Changes Classify each of the following as a physical
or chemical change. Sugar fermenting to form ethyl alcohol Dissolving of sugar in water Iron metal melting Iron combining with oxygen to form rust
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Atomic Theory Atom: the smallest piece of an element
you can have that retains the characteristics of that element. 116 known: 91 found in nature, others are man
made.
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Atomic TheoryDalton’s Atomic Theory Elements are made of tiny particles called
atoms. All atoms of a given element are identical. The atoms of a given element are
different from those of any other element.
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Atomic TheoryDalton’s Atomic Theory Atoms are indivisible in chemical
processes. Atoms combine in simple, whole-number
ratios to form molecules or compounds. A given compound always has the exact
same numbers and types of atoms.
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The Nuclear Atom
Work done by J. J. Thomson and others proved that the atom had pieces called electrons. Electrons are much smaller than atoms and
carry a negative charge. The atom must also contain positive particles
that balance exactly the negative charge carried by electrons.
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The Nuclear AtomPlum Pudding Model Reasoned that the atom
might be thought of as a uniform “pudding” of positive charge with enough negative electrons scattered within to counterbalance that positive charge.
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The Nuclear Atom
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The Nuclear Atom
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The Nuclear Atom The atom contains a tiny dense center
called the nucleus. The nucleus has essentially the entire mass of
the atom and is positively charged. The electrons are dispersed in the empty
space of the atom surrounding the nucleus.
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The Nuclear Atom The nucleus has a particle that has the
same amount of charge as an electron but opposite sign. These particles are called protons.
Atoms are neutral, therefore the number of protons must equal the number of electrons.
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The Nuclear Atom Most nuclei also contain a neutral particle
called the neutron. A neutron has approximately the same
mass as a proton but has no charge.
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The Nuclear Atom
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Summary of Topics: Chapter 1
What is Chemistry? Scientific method States of Matter Composition of Matter
Pure substances: compounds and elements Mixtures: homogeneous and heterogeneous
Chemical, Physical properties and changes Dalton’s Atomic Theory Nuclear model of the atom