# Shared Flashcard Set

## Details

Chapter 2
Measurements and Calculations
19
Chemistry
01/04/2011

## Additional Chemistry Flashcards

Term
 Scientific Method
Definition
 is a logical approach to solving problems by observing and collecting data, formulating hypotheses, testing hypotheses, and formulating theories that are supported by collected data.
Term
 System
Definition
 is a specific portion of matter in a given region of space that has been selected for study during an experiment or observation.
Term
 Hypothesis
Definition
 is known as a testable statement.
Term
 Model
Definition
 is more than a physical object; it is often an explaination of how phenomena occur and how data or events are related.
Term
 Theory
Definition
 is a broad generalizatiom that explains a body of facts or phenomena.
Term
 Quantity
Definition
 is something that has magnitude, size, or amount.
Term
 SI
Definition
 Le Systeme International d'Unites.
Term
 Weight
Definition
 is a measurement of the gravitational pull on matter.
Term
 Derived Units
Definition
 combination of SI base units.
Term
 Volume
Definition
 is the amount of space occupied by an object.
Term
 Density
Definition
 is the ratio of mass to volume.
Term
 Dimentsional Analysis
Definition
 is a mathematical technique that allows you to use units to solve problems involving measurements.
Term
 Accuracy
Definition
 refers to the closeness of measurements to the correct or accepted value of the quantity measured.
Term
 Precision
Definition
 refers to the closeness of a set of measurements of the same quantity made in the same way.
Term
 Percentage Error
Definition
 is calculated by subtracting the accepted value from the experimental value, dividing the difference by the accepted value, and then multiplying by 100.
Term
 Significant Figures
Definition
 in a measurement consists of allthe digits known with certainty plus one final diget, which is somewhat uncertain or is estimated.
Term
 Scientific Notation
Definition
 numbers are written in the form of (M*10^n)where the factor M is a number greater than or equal to 1 but less that 10 and n is a whole number.
Term
 Directly Proportional
Definition
 the relationship between two variables whose ratio is a constant value.
Term
 Inversely Proportional
Definition
 the relationship between two variables whose product is constant.
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