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Chapter 1 Keys to the Study of Chemistry
Chapter 1 General Chem Silberberg
46
Chemistry
Undergraduate 1
05/17/2010

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Term
Chemistry
Definition
Study of matter and its properties, the changes that matter undergoes, and the energy associated with those changes
Term
Matter
Definition
Anything that has mass and occupies space
Term
Composition
Definition
Types and amounts of simpler substances that make it up
Term
Properties
Definition
The characteristics that give each substance its unique identity
Term
Physical Properties
Definition
Shows by itself, without changing into or interacting with another substance
Term
Chemical Properties
Definition
Shows as it changes into or interacts with another substance (or substances)
Term
Chemical change/Chemical reaction
Definition
Substance (or substances) is converted into a different substance (or substances)
Term
States
Definition
Physical form
Term
Solid
Definition
Has a fixed shape that does not conform to the container shape
Term
Liquid
Definition
Conforms to the container shape but fills the container only to the extent of the liquid's volume, forms a surface
Term
Gas
Definition
Conforms to the container shape also, but it fills the entire container and does not form a surface
Term
Potential Energry
Definition
Energy due to the position of the object
Term
Kinetic Energy
Definition
Energy due to the motion of the object
Term
Scientific Method
Definition
Flexible process of creative thinking and testing aimed at objective, verifiable discoveries about how nature works
Term
Variables
Definition
Quantities that can have more than a single value
Term
Controlled
Definition
Measures the effect of one variable on another while keeping all others constant
Term
Data
Definition
Pieces of quantitative information are data
Term
Natural Law
Definition
When the same observation is made by many investigators in many situations with no clear exceptions often summarzied in matical terms
Term
Theories
Definition
Conceptual Models based on experiments
Term
Conversion Factors
Definition
Ratios used to express a measured quantity in different units
Term
Dimensional Analysis
Definition
Used of conversion factors in calculations (units represent physical dimensions)
Term
Si Units
Definition

Kg,m,s,K,A,mol,cd

French Systeme International d'Unites

Term
Fundamental Units/Base Units
Definition
Each of which is identified with a physical quantity (look at SI Units)
Term
Derived Units
Definition
Combinations of these seven base units (speed, density)
Term
Length
Definition
SI base unit meter
Term
Volume
Definition
Amount of space that the sample occupies cubic meter
Term
Mass
Definition
Object refers to the quantity of matter it contains, kilogram
Term
Weight
Definition
Mass stays constant but weight depends on the mass andĀ the strength of the local gravitational fieldĀ pulling on it
Term
Density
Definition
Mass/Volume
Term
Extensive Properties
Definition
Those dependent on the amount of substance present (Mass and volume)
Term
Intensive Property
Definition
One that is independent of the amount of substance (density)
Term
Temperature
Definition
Measure of how hot or cold a substance is relative to another substance
Term
Heat
Definition
The energy that flows between objects that are at different temperature
Term
Thermometer
Definition
Device that contains a fluid that exapands when it is heated
Term
Kelvin
Definition
Absolute scale, SI unit
Term
Celsius
Definition
Based on changes in the physical state of water
Term
Time
Definition
Seconds SI unit
Term
Uncertainty
Definition
Limited specifications of an instrument and imperfect skills and senses to read them
Term
Significant Figures
Definition
Digits that we record in measurement certain or uncertain ones
Term
Round off
Definition
Obtaining the proper number of sig figs
Term
Exacr Numbers
Definition
No uncertainty associated
Term
Precision
Definition
Reproducibility refers to how close the measurements in a series are to each other
Term
Accuracy
Definition
Refers to how close a measurement is to the actual value
Term
Systematic Error
Definition
Produces value that are either all higher or all lower than the actual value. Often caused by a faulty measuring device or by a consistent mistake in taking a reading
Term
Random Error
Definition
Absence of systematic error produces values that are higher and lower than the actual value. Always occurs but size depends on the measurer's skill and the instrument's precision
Term
Calibration
Definition
Comparing it with a known standard
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