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Chapter 2 Notes
Notes
38
Chemistry
10th Grade
09/10/2013

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Term
Atoms
Definition
Smallest particles of matter.
Term
Atomic Theory
Definition
The idea that matter is made of fundamental particles.
Term
Law of definite Proportions
Definition
Elements that composed the compounds were always in a certain proportions.
Term
Hypothesis
Definition
A testable prediction
Term
Experiment
Definition
An investigation with a control designed to test a hypothesis.
Term
Theory
Definition
An explanation based on many observations and supported by the results of many investigations.
Term
Scientific Method
Definition
a method of procedure that has characterized natural science since the 17th century, consisting in systematic observation, measurement, and experiment, and the formulation, testing, and modification of hypotheses.
Term
Scientific Law
Definition
A fact of nature that is observed so often that it becomes accepted as truth. (Example: the sun rises in the east each morning is a law of nature)
Term
Electrons
Definition
Negatively charged particles
Term
Protons
Definition
Positively charged particles
Term
Isotopes
Definition
Atoms of an element that are chemically alike but differ in mass.
Term
Neutron
Definition
Neutral particle
Term
Nucleus
Definition
Positively charged central core
Term
Atomic Number
Definition
The number of protons in the nucleus of an atom of that element.
Term
Mass Number
Definition
The sum of protons and neutros in the nucleus.
Term
Atomic Mass Unit
Definition
u -apparently the approximately the mass of a single proton or neutron.
Term
Atoms
Definition
Smallest particles of matter.
Term
Atomic Theory
Definition
The idea that matter is made of fundamental particles.
Term
Law of definite Proportions
Definition
Elements that composed the compounds were always in a certain proportions.
Term
Hypothesis
Definition
A testable prediction
Term
Experiment
Definition
An investigation with a control designed to test a hypothesis.
Term
Theory
Definition
An explanation based on many observations and supported by the results of many investigations.
Term
Scientific Method
Definition
a method of procedure that has characterized natural science since the 17th century, consisting in systematic observation, measurement, and experiment, and the formulation, testing, and modification of hypotheses.
Term
Scientific Law
Definition
A fact of nature that is observed so often that it becomes accepted as truth. (Example: the sun rises in the east each morning is a law of nature)
Term
Electrons
Definition
Negatively charged particles
Term
Protons
Definition
Positively charged particles
Term
Isotopes
Definition
Atoms of an element that are chemically alike but differ in mass.
Term
Neutron
Definition
Neutral particle
Term
Nucleus
Definition
Positively charged central core
Term
Atomic Number
Definition
The number of protons in the nucleus of an atom of that element.
Term
Mass Number
Definition
The sum of protons and neutros in the nucleus.
Term
Atomic Mass Unit
Definition
u -apparently the approximately the mass of a single proton or neutron.
Term
Electromagnetic Spectrum
Definition
the range of wavelengths or frequencies over which electromagnetic radiation extends.
Term
Emission Spectrum
Definition
The spectrum of light released from excited atoms of an element
Term
Energy Levels
Definition
These regions of space in which electrons can move about the nucleus of an atom.
Term
Electron Cloud
Definition
The space around the nucleus of an atom where the atom's electrons are most likely to be found.
Term
Valence Electrons
Definition
The electrons in the outermost energy level
Term
Lewis Dot Diagram
Definition
Illustrates valence electrons as dots around the chemical symbol of an element.
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