introduction to physical science - mr. finke's science...
TRANSCRIPT
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Introduction to Physical
Science
Introduction to Physical Science
Matter
Chemistry
Force and Motion
Energy
Waves, Sound and Light
Electricity and Magnatism
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What is Science?
Science is a method for studying the
natural world.
It is a process that uses and to gain
knowledge about events in nature
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What is Science?
Nature follows a set of rules
many rules, such as
those concerning
how the human
body works, are complex
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What is Science?
Other rules, such as the fact that Earth
rotates about once every 24 h, are much
simpler.
Scientists ask questions to learn about the
natural world.
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Defining Science
Life Science the study of living organisms
Earth Science the study of Earth and space
Physical Science the study of matter and energy
chemistry & physics
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Defining Science • Sometimes, a scientific study will overlap the
categories.
• One scientist, for
example, might study
the motions of the
Human body to
understand how
to build better artificial
limbs.
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States of Matter
A. The Kinetic Theory
1. All matter is composed of small particles
(atoms, molecules, or ions).
2. They are in constant, random motion.
3. They constantly collide with each other
and with the walls of their container.
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B. Phase Properties
Phase
Particle Properties
Proximity Energy Motion Volume Shape
Solid
Liquid
Gas
close little vibrational definite definite
close moderate rotational definite indefinite
far apart a lot translational indefinite indefinite
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Boyle’s Law.
The volume of a gas varies
inversely with its pressure if
temperature remains constant
Pushing the
plunger down
will increase
the pressure
Volume of the gas
inside the cylinder
will decrease
G s S
A G A
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Charles’s Law
The volume of a gas varies directly with its temperature if pressure
remains constant
A balloon shrinks when
placed in cold water
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Why is the Periodic Table important
to me? The periodic table is
the most useful tool
to a chemist.
You get to use it on
every test.
It organizes lots of
information about
all the known
elements.
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Pre-Periodic Table Chemistry …
…was a mess!!!
No organization of elements.
Imagine going to a grocery store with no organization!!
Difficult to find information.
Chemistry didn’t make sense.
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Dmitri Mendeleev: Father of
the Table
HOW HIS WORKED…
Put elements in rows by increasing atomic weight.
Put elements in columns by the way they reacted.
SOME PROBLEMS…
He left blank spaces for what he said were undiscovered elements. (Turned out he was right!)
He broke the pattern of increasing atomic weight to keep similar reacting elements together.
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The Periodic Law
Properties of elements are a periodic
function of their Atomic Numbers.
So…this means that when you arrange
the elements according to their atomic
numbers, you see a repetition of their
physical and chemical properties.
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Relation to elements….
Chemical
elements are
arranged in
groups that
have similar
chemical and
physical properties.
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CHEMISTRY
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Composition of Matter
Matter - Everything in universe is composed of matter Matter is anything that occupies
space or has mass
Mass – quantity of matter an object has
Weight – pull of gravity on an object
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Elements
Pure substances that cannot be broken down chemically into simpler kinds of matter
More than 100 elements (92 naturally occurring)
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90% of the mass of an organism is composed of 4 elements (oxygen, carbon, hydrogen and nitrogen)
Each element unique chemical symbol Consists of 1-2 letters
First letter is always capitalized
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Atoms The simplest particle of an element that retains all the properties of that element
Properties of atoms determine the structure and properties of the matter they compose
Our understanding of the structure of atoms based on scientific models, not observation
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The Nucleus Central core
Consists of positive charged protons and neutral neutrons
Positively charged
Contains most of the mass of the atom
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The Protons
All atoms of a given element have the same number of protons
Number of protons called the atomic number
Number of protons balanced by an equal number of negatively charged electrons
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The Neutrons
The number varies slightly among atoms of the same element
Different number of neutrons produces isotopes of the same element
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Atomic Mass
Protons & neutrons are found in the nucleus of an atom
Protons and neutrons each have a mass of 1 amu (atomic mass unit)
The atomic mass of an atom is found by adding the number of protons & neutrons in an atom
# of protons + # of neutrons =atomic mass
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The Electrons
Negatively charged high energy particles with little or no mass
Travel at very high speeds at various distances (energy levels) from the nucleus
Are located around the nucleus
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Periodic Table Elements are arranged by their atomic
number on the Periodic Table The horizontal rows are called Periods &
tell the number of energy levels Vertical groups are called Families & tell
the outermost number of electrons
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Compounds Most elements do not exist by themselves
Readily combine with other elements in a predictable fashion
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A compound is a pure substance made up of atoms of two or more elements The proportion of atoms are
always fixed
Chemical formula shows the kind and proportion of atoms of each element that occurs in a particular compound
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Molecules are the simplest part of a substance that retains all of the properties of the substance and exists in a free state
Some molecules are large and complex
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Chemical Formulas Subscript after a symbol tell the number of atoms
of each element
H20 has 2 atoms of hydrogen & 1 atom of oxygen
Coefficients before a formula tell the number of molecules
3O2 represents 3 molecules of oxygen or (3x2) or 6 atoms of oxygen
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The tendency of elements to combine and form compounds depends on the number and arrangement of electrons in their outermost energy level
Atoms are most stable when their outer most energy level is filled (when it has 8 electrons)
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Most atoms are not stable in their natural state
Tend to react (combine) with other atoms in order to become more stable (undergo chemical reactions)
In chemical reactions bonds are broken; atoms rearranged and new chemical bonds are formed that store energy
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Covalent Bonds
Formed when two atoms share one or more pairs of electrons
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Ionic Bonds
Some atoms become stable by losing or gaining electrons
Atoms that lose electrons are called positive ions
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Atoms that gain electrons are called negative ions
Because positive and negative electrical charges attract each other ionic bonds form
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Motion and Forces
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Forces Force- push or pull that one object exerts on
another
Examples: hitting a baseball, throwing a basketball,
etc.
Forces aren’t always noticeable
Floor pushes up on you- otherwise you’d fall
Forces influence motion
Changes the velocity- either the speed or direction
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Forces Net Force- Total force on an object
If forces are balanced, no movement occurs- net force is zero
Balanced forces- forces equal in size but opposite in direction
Why don’t you fall through the floor?? http://www.teachersdomain.org/resources/phy03/sci/phys/mfw/goalstring/index.html
Unbalanced force- force that is not balanced by another force
Results in movement
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Motion and
Forces Physical Science 2.3
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Forces Force- push or pull that one object exerts on
another
Examples: hitting a baseball, throwing a basketball,
etc.
Forces aren’t always noticeable
Floor pushes up on you- otherwise you’d fall
Forces influence motion
Changes the velocity- either the speed or direction
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Forces Net Force- Total force on an object
If forces are balanced, no movement occurs- net force is zero
Balanced forces- forces equal in size but opposite in direction
Why don’t you fall through the floor?? http://www.teachersdomain.org/resources/phy03/sci/phys/mfw/goalstring/index.html
Unbalanced force- force that is not balanced by another force
Results in movement
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Forces Strong force to the right, weak force to the left = move to the right
Inertia- the tendency of an object to resist any change in motion
If moving- stays moving unless acted on by unbalanced force
If stopped- stays stopped unless acted on by unbalanced force
Car should stay in motion once it starts in motion
Problem: friction opposes motion
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Forces
Inertia and injury
In car crashes, you tend to remain in motion
until you are acted on by a force (until you
hit something that resists you)
Seatbelts
Prevents people from being thrown from
the car- provides unbalanced force to stop
inertia
Increases time over which patient slows
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Forces Strong force to the right, weak force to the left = move to the right
Inertia- the tendency of an object to resist any change in motion
If moving- stays moving unless acted on by unbalanced force
If stopped- stays stopped unless acted on by unbalanced force
Car should stay in motion once it starts in motion
Problem: friction opposes motion
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Forces
Inertia and injury
In car crashes, you tend to remain in motion
until you are acted on by a force (until you
hit something that resists you)
Seatbelts
Prevents people from being thrown from
the car- provides unbalanced force to stop
inertia
Increases time over which patient slows
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A. Energy
ENERGY
motion of
electric charges
bonding of
atoms
motion of
objects
internal motion of particles
changes in the
nucleus
The ability to
cause
change.
MECHANICAL
ELECTRICAL CHEMICAL
NUCLEAR
THERMAL
joules (J)
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A. Energy Kinetic Energy (KE)
energy in the form of motion
depends on mass and velocity
80 km/h
50 km/h
80 km/h
80 km/h truck
50 km/h motorcycle
• Which has the most KE?
• Which has the least KE?
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A. Energy Potential Energy (PE)
stored energy
depends on position or configuration of an
object
• Which boulder has greater
gravitational PE?
• What other ways can an
object store energy?
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C. Conservation of Energy
Law of Conservation of Energy
Energy may change forms, but it cannot be created
or destroyed under ordinary conditions.
EX:
PE KE
mechanical thermal
chemical thermal
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C. Conservation of Energy
PE KE
View pendulum animation. View roller coaster animation.
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C. Conservation of Energy
Mechanical Thermal
View rolling ball animations. View skier animation.