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Chem 115 > Chapter 1 > Flashcards

Chapter 1 Flashcards

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1
Q

What is a Science

A

The observation, identification, description, experimental investigation, and theoretical explanation of natural phenomena.

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2
Q

Chemistry

A

The science of the composition, structure, properties and reactions of matter, especially of atomic and molecular systems.

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3
Q

Scientific Method

A

Hypothesis
Theory
Law

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4
Q

Hypothesis

A

a guess before testing data

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5
Q

Theory

A

better explained hypothesis with enough information on data to support it

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6
Q

Law

A

A law is an explanation.

It something observed multiple times w/o changes in the end result

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7
Q

Steps in Scientific Method

A
  1. Collect facts or data (educated guess)
  2. Analyze data to find trends
  3. Formulate hypothesis for data that can be further tested (initial guess)
  4. Plan & do additional experiments (continue testing)
  5. Modify the hypothesis for compatibility with tested data (change hypothesis until it explains experiment)
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8
Q

Matter

A

anything with mass and occupies space

  • made of atoms
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9
Q

Elements

A

contain only 1 kind of atom

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10
Q

Compounds

A

contain two or more kinds of atoms

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11
Q

States of Matter

A

Solid
Liquid
Gas

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12
Q

Solid

A
  • definite shape & volume
  • incompressible
  • held together by strong forces of attraction
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13
Q

Liquid

A
  • takes the shape of its container
  • indefinite shape & definite volume
  • compressible
  • held together by strong forces of attraction
  • mobile, move around ea. other
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14
Q

Gas

A
  • takes the shape and volume of its container
  • indefinite shape & volume
  • compressible
  • particles are independent bc weak forces of attraction
  • far apart and small compared to volume occupied
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15
Q

Crystalline solids

A

regular repeating 3-dimensional geometric patterns

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16
Q

Amorphous solids

A

no regular internal geometric pattern

17
Q

Substance

A

has a definite & fixed composition

18
Q

Homogeneous

A

same properties throughout & only 1 phase

can’t see a difference

19
Q

Mixture

A

composition can be varied

20
Q

Heterogeneous

A

different physical phases

difference is seen

21
Q

Phase

A

a homogeneous part of a system separated from other parts by physical boundaries

Chem 115 (11 decks)

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