Physical Science Flashcards

1
Q

Chemistry

A

the study of elements and the compounds
they form. Matter can take the form of an element, a
compound, or a mixture.

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2
Q

Element

A

the basic form of matter, incapable
of being decomposed by chemical means into simpler
substances. Each element has distinct chemical and
physical characteristics. Hydrogen (H), oxygen (O),
and carbon (C) are elements.

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3
Q

Compound

A

a combination of two or more
elements chemically combined in a specific proportion.
Compounds can be separated by chemical means,
and are represented by chemical formulas that include
the symbols of all the elements present. Examples of
familiar compounds are water (H2O) and table salt
(NaCl). In order to be considered organic, a compound
must contain carbon.

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4
Q

Mixture

A

a combination of two or more substances
that are not chemically combined. Dissolving
salt in water results in a mixture. The two compounds
don’t react with each other and can be separated by
physical means—in this case, heating the water so it
evaporates, leaving the salt behind.

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5
Q

Atom

A

the smallest unit of an element that retains
all of the element’s chemical properties. An atom
is composed of three primary particles: electrons,
protons, and neutrons.

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6
Q

Electron

A

found outside the nucleus (the center of
an atom), it has a negligible mass and a charge
of –1.

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7
Q

Proton

A

found in the nucleus, it has a mass of 1

amu (atomic mass unit) and a charge of +1.

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8
Q

Neutron

A

found in the nucleus, it has a mass of 1

amu and no charge.

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9
Q

Atomic number

A

the number of protons in the atom. The atomic number determines the element.

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10
Q

Mass number

A

the total number of protons and
neutrons in one atom of an element. Mass number
can vary because the number of neutrons in an atom
can change.

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11
Q

Solid

A

Retains a fixed volume and shape

  • Not easily compressible
  • Does not flow easily
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12
Q

Liquid

A

Assumes the shape of the part of the container which it occupies

  • Not easily compressible
  • Flows easily
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13
Q

Gas

A
  • Assumes the shape and volume of its container
  • Compressible
  • Flows easily
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14
Q

Combined Gas Law

A

According to the law, if volume remains constant,

pressure will change in proportion to temperature.

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15
Q

Dalton Model

A

1803 John Dalton proposed an “atomic theory” with spherical solid atoms based upon measurable properties of mass. “Solid Sphere Model”

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16
Q

Thomson Model

A

1898 JJ Thomson used a CRT to experimentally determine the charge to mass ratio of an electron. “Plum Pudding Model” / Electrons

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17
Q

Rutherford Model

A

•1911 Rutherford Nucleus is dense, small, and positively charged. Electrons are located outside the nucleus. “Planetary Model” / Nucleus

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18
Q

Bohr Model

A

•1922 Niels Bohr Developed an explanation of atomic structure that underlies regularities of the periodic table of elements. “Electron Shells”

19
Q

Alloy

A

A homogeneous mixture or solid solution of two or
more metals, the atoms of one replacing or occupying
interstitial positions between the atoms of the other.

20
Q

Combination (synthesis) reaction

A

where two or more substances are bonded together to produce a single product.
A reaction of the type: A + B –> AB

21
Q

Decomposition

A

the fragmentation of a chemical compound into elements or smaller compounds.
A reaction of the type: AB –> A + B

22
Q

Double-displacement reaction

A

where parts of two reacting structures swap places. A reaction of the type: AB + CD –> AD + CB

23
Q

Single-displacement reaction

A

where one element appears to move out of one compound and into another. A reaction of the type: A + BX –> AX + B

24
Q

Hooke’s Law

A

Hooke’s Law of elasticity is an approximation that states that the amount by which a material body is deformed (the strain) is related to the force causing the deformation (the stress).

25
Q

Newton’s First Law

A

An object will stay at rest or move at a constant velocity (constant speed in a straight line) unless acted upon by an unbalanced force.

26
Q

Newton’s Second Law

A

The rate of change of the momentum of a body is directly proportional to the net force acting on it, and the direction of the change in momentum takes place in the direction of the net force

27
Q

Newton’s Third Law

A

For every action (force applied) there is an equal but opposite reaction (equal force applied in the opposite direction).

28
Q

Frequency

A

the measurement of the number of times a repeated event occurs per unit of time.

29
Q

Doppler Effect

A

the apparent change in frequency and wavelength of a wave that is perceived by an observer moving relative to the source of the waves.

30
Q

Diffraction

A

the bending of waves around obstacles and the spreading out of waves beyond openings.

31
Q

Series Circuits

A

Current remains constant but voltage
drops differently across components
of the circuit that have resistance.

32
Q

Parallel Circuits

A

Voltages across components are the
same, but each component drops
different amounts of current.

33
Q

Conservation of energy

A

The total amount of energy (including potential energy) in a closed system remains constant. In other words, energy can be converted from one form to another, but it cannot be created or destroyed.

34
Q

Energy input / output

A

the kind of energy that goes into a system and the resultant energy that comes out of a system; excess energy input deals with how much energy remains in a system that is not output; (ex. incoming solar radiation minus the infrared radiation back into space)

35
Q

Entropy

A

the measure of unavailable energy in a closed system / most common reference to entropy is found in thermodynamic systems

36
Q

Energy loss

A

energy that is not used to complete the intended processes of a system (ex. waste heat from an incandescent bulb or motor)

37
Q

Alpha decay

A

A form of radioactive decay in which an atomic nucleus ejects an alpha particle through the electromagnetic force
And transforms into a nucleus with mass number
4 less and atomic number 2 less.

38
Q

Beta decay

A

A form of radioactive decay in which a beta particle (an electron or a positron) is emitted.

39
Q

Fission

A

A process in nuclear physics in which the nucleus of an atom splits into two or more smaller nuclei as fission products, and usually some by-product particles.

40
Q

Fusion

A

A nuclear reaction in which nuclei combine to form more massive nuclei with the simultaneous release of energy.

41
Q

Convex

A

Light curved outward like the outer surface of a sphere

42
Q

Concave

A

Light curved inward like the inner surface of a sphere

43
Q

Flat

A

no curved surface giving no curved image reflection

44
Q

Parabolic

A

a reflective device, formed in the shape of a parabolic dish; parabolic reflectors can either collect or distribute energy such as light, sound, or radio waves.