## CHM-131-160 Unit One

 Matter
 A substance that has mass and occupies volume with characteristic properties.
 Law of Conservation of Matter
 The total amount of materials present before a chemical reaction is the same as that present at the end of it.“Matter can neither be created nor destroyed in a chemical reaction.”
 Law of Conservation of Energy
 The total energy of a system before a chemical reaction is the same as the total energy at the end of the reaction. It can transform but cannot disappear. “Energy can neither be created nor destroyed.”
 Characteristic Properties of Matter
 mass, volume, density, temperature, reactivity, conductivity, color, etc.
 Quantitative Properties
 Measurements that have both a number and unit. e.g. 12 grams
 What is the SI unit for mass?
 kilogramkg
 What is the SI unit for length?
 metersm
 What is the SI unit for time?
 seconds
 What is the SI unit for temperature?
 KelvinK
 What is the SI unit for amount?
 molemol
 Giga
 10^9
 Mega
 10^6
 kilo
 10^3
 deci
 10^-1
 centi
 10^-2
 mili
 10^-3
 micro
 10^-6
 nano
 10^-9
 pico
 10^-12
 femto
 10^-15
 What is the SI unit for volume?
 m^3
 One cubic meter equals _____ liters?
 1,000
 One liter equals _____ cubic centimeters?
 1,000
 One mili liters equals _____ cubic centimeters?
 1
 One liter equals _____ deci meters?
 1
 What is absolute zero is…?
 -273.15 degrees C or 0 K.
 What is the equation to go from F to C ?
 F = ( 9/5 C ) + 32
 What is the equation to go from C to F ?
 C = ( F – 32) 5/9
 What is the equation for density?
 D = M x V
 What is the official SI unit for density?
 kg/m^3
 What are the two classifications for measurements?
 exact and inexact
 When adding and subtracting, how are the significant figures determined?
 You ignore the places to the left of the decimal place. You then count the decimal places to the right of the decimal place and then take the smallest number. This is the number of significant figures behind the decimal.
 When multiplying and dividing, how are the significant figures determined?
 You count the sig figs in all the numbers and choose the least number.
 Precision
 How well measured quantities agree with each other.
 Accuracy
 How well measured quantities agree with the “true value.”
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