# Shared Flashcard Set

## Details

Flashcards for Chapter 2 in Chemistry
Flash cards for Chapter 2 in Mrs. Jackson's Chemistry class
36
Chemistry
09/18/2011

Term
 What is a base unit?
Definition
 a defined unit in a system of measurement that is based on an object or event in the physical world and is independent of other units
Term
 What is density?
Definition
 the amount of mass per unit volume
Term
 What is the equation for density?
Definition
 D=m/v
Term
 What is a derived unit?
Definition
 a unit defined by a combination of base units
Term
 What is a conversion factor?
Definition
 a ratio of equivalent values used to express the same quantity, always equals 1 and changes the units of a quantity without changing its value
Term
 What is dimensional analysis?
Definition
 a systematic approach to problem solving that uses conversion factors to move from one unit to another
Term
 What is an error?
Definition
 the difference between an experimental value and an accepted value
Term
 What is a graph?
Definition
 a visual display of data
Term
 What is kelvin(K)?
Definition
 the SI base unit of temperature-not measured in degrees
Term
 What is the SI base unit for mass?
Definition
 Kilogram
Term
 What is the metric unit of volume equal to one cubic decimeter?
Definition
 liter
Term
 What is the SI base unit for length?
Definition
 meter
Term
 What is percent error?
Definition
 the ratio of an error to an accepted value
Term
 What is the SI base unit for time?
Definition
 second
Term
 What is scientific notation?
Definition
 a method used to express any number as a number between 1 and 10 multiplied by 10 raised to a power(exponent) an example would be 1.24 x 1012
Term
 What is a significant figure?
Definition
 the number of all known digits reported in measurements plus one estimated digit
Term
 What is the equation for percent error?
Definition
 [image]
Term
 How do you convert Celsius to Kelvin?
Definition
 K=273+temperature in Celsius
Term
 How do you find Slope?
Definition
 you divide the dependent y variable by the independent x variable-rise over run
Term
 What is the difference between accuracy and precision?
Definition
 Accuracy refers to how close a measured value is to an accepted value where precision is how close a series of measurements are to one another.
Term
 When multiplying scientific notations what do you do?
Definition
 multiply the coefficients and add the exponents
Term
 What do you do in the division of numbers in scientific notation?
Definition
 divide coefficients and subtract the exponents
Term
 How many significant digits does 12.3 have? Give the rule explaining why.
Definition
 3; Non-Zero numbers are always significant
Term
 How many significant digits does 1098.3 have? Give the rule why.
Definition
 5; because Zeros between nonzero numbers are always significant
Term
 How many significant digits does 12.0 have? Give the rule why.
Definition
 3 because All final zeros to the right of the decimal are significant
Term
 How many significant digits does 0.0023 have? give the rule why.
Definition
 2; In a decimal number, zeros that come before the significant number are not significant
Term
 How many significant digits does 23,000 have? Give the rule why.
Definition
 2; trailing zeros without a decimal are not significant, however if the number was 23,000.0 the zeros would be significant
Term
 What determines the number of significant digits when adding, subtracting, multiplying, or dividing?
Definition
 the number with the lowest number of significant digits
Term
 How do you round 5's when there are zeros after them or no digits after?
Definition
 Round down if the digit before the 5 is even and round up if the digit before the 5 is odd
Term
 What are the 3 major types of graphs?
Definition
 Circle graph, Line Graph, and Bar Graph
Term
 What graph is useful for showing parts of a whole?
Definition
 circle graph
Term
 What graph is useful in showing how quantities vary across categories?
Definition
 Bar graph
Term
 What graph is used to show the relationship between the independent variable and the dependent variable?
Definition
 Line graph
Term
 What is interpolation when interpreting a graph?
Definition
 it is any data points that are included on the line between the recorded points of data
Term
 What is extrapolation?
Definition
 extending a line beyond the plotted points in order to estimate futher data
Term
 What is the base unit for (a)temperature, (b)length, (c) mass, (d)time?
Definition
 a. Kelvin(K); b.meters(m); c. kilogram(kg); and d.seconds(s)
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