Chapter 3 Flashcards
Measurement
Quantify that has a number and unit.
Measurements are fundamental to the experimental sciences.
Metric System
Based on the number 10
Scientific Notation
Has a coefficient and 10 raised to a power.
Accuracy
The measure of how close answers are to the true or given measurement.
Precision
The measure of how close answers are to each other.
If you are accurate you have to be precise, but if you are precise you do not have to be accurate. Explain.
Bullseye or Basketball example.
Accepted Value
Correct value based on a reliable reference.
Experimental Value
The value measured in the lab.
Error
Difference between accepted and experimental value.
Error Formula
Error = Expirimental value - Accepted value
Percent(%) Error
Absolute value of the error divided by the accepted value, multiplied by 100.
% Error Formula
% Error = (error/ accepted value) x 100
Significant Figures
Measurements include all digits that are known plus a last digit that is estimated.
Kilo
1000
Deci
1/10
Centi
1/100
Mili
1/1000
Volume
Amount of space occupied.
l x w x h
Length
Point A to Boint B
Mass
Amount of matter.
Matter
Anything with mass and volume.
Weight
Pull of gravity on mass.
Temperature
The measure of average kinetic energy of particles or molecules.
Kelvin to Celcius Formula
Kelvin = Celcius + 273
Energy
The ability to do work or produce heat.
Work
Force moving an object.
Force
Push or pull.
Joule to Calorie
1 joule = .2390 calorie
Calorie to Joule
1 calorie = 4.184 joules
Conversion Factor
Rate of equivalent measurements.
Dimensional Analysis
Way to analyze and solve problems using the units or dimensions of the measurements.
Density
Density = Mass/ Volume
