# Shared Flashcard Set

## Details

Chapter 3 Chem. Test Review
Conversions, Word Problems, Vocabulary
34
Chemistry
02/23/2010

Term
 Practice
Definition
 A skill in which problem solving is leaned from.
Term
 Unknown
Definition
 1.The answer to the problem. 2.What you are trying to find.
Term
 Sig Figs
Definition
 The answer to a problem should always be expressed to the correct number significant figures.
Term
 Exponential (form)
Definition
 Where approtiate the answer should be written in standard form or Standard notation.
Term
 Check
Definition
 Its important to check your work.
Term
 Ratio
Definition
 two measurements
Term
 One (unity)
Definition
 a ratio of two equal measurements will equal one.
Term
 Conversion
Definition
 a problem where you are asked to express a given measurement in a different unit.
Term
 When a measurement is multiplied by a conversion factor, the value of the measurement _______
Definition
 Remains the same.
Term
 Dimensional Analysis
Definition
 Uses units that are part of the measurements, and are used to help solve the problem.
Term
 The form of the conversion factor that is used is the one in which the unit of the ______ is in the denominator.
Definition
 Known num.
Term
 A ratio of equivalent measurements is called a _____
Definition
 Conversion Factor
Term
 Liters [ex. express 150mL in liters]
Definition
 The unknown is a number of LITERS.
Term
 The known is________ [ex. express 150mL in liters]
Definition
 150 mL
Term
 T/F The expression relating Liters and 150mL is 1000mL=1L
Definition
 True
Term
 In multi step problems it is important to check that the numerator and ______ of each conversion factor are equivalent.
Definition
 Denominator
Term
 Units
Definition
 Cancel out and must be equal.
Term
 ST/NT/AT? All th information needed to solve a word problem will be given in the problem.
Definition
 ST
Term
 ST/NT/AT? All the information given in a word problem will be used in the solution of that problem.
Definition
 ST
Term
 The units of a conversion factor must cancel.
Definition
 NT (equal)
Term
 ST/NT/AT? Once the solution to a conversion problem is set up, the next step is to do the arithmetic.
Definition
 NT The next step is to cancel out the units.
Term
 ST/NT/AT? The first step in solving a problem is to identify the unknown.
Definition
 AT
Term
 ST/NT/AT? Conversion factors are written so that the unit of the known is in the denominator.
Definition
 ST (ex. m/s to km/hr)
Term
 ST/NT/AT? If density=mass/volume, then mass=density/volume
Definition
 NT m=dxv (remember formula triangle :] )
Term
 ST/NT/AT? Answers to problems are given in standard exponential form.
Definition
 ST
Term
 ST/NT/AT? When two measurements are equal, a ratio of these two measurements will equal unity.
Definition
 AT
Term
 What is the conversion factor?: Years to days
Definition
 365d/1y
Term
 What is the conversion factor?:liters to cubic decimeters
Definition
 1dm^3/lL
Term
 What is the conversion factor?:Milligrams to grams
Definition
 1g/1000mg
Term
 What is the conversion factor?:minutes to hours
Definition
 1hr/60min.
Term
 What is the conversion factor?:grams to kilograms
Definition
 1kg/1000g
Term
 What is the conversion factor?:minutes to hours
Definition
 1hr/60min.
Term
 1Kg/1000g
Definition
 Conversion factor:grams to kilograms
Term
 where does e^# go?
Definition
 to the lowest of the two values. 1 goes to the greatest value. So if grams and Kilograms are being compared it will be 1k/e^3g because kilograms are greater than grams.
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