Chapter E- Definitions Flashcards
Mass
The amount of matter in an object
Weight
Measure of gravitational pull on matter
Temperature
Measure of the amount of kinetic energy of the molecules/atoms of a substance
Volume
Measure of space
Significant Figure (/Digit)
A non-placeholder digit (more digits= more certainty)
Density
mass/ volume (usually expressed as cm^3 or mL)
Exothermic
Reaction in which energy is transferred from the system to the surroundings (negative change in energy)
Endothermic
Reaction in which energy is transferred from the surroundings to the system (positive change in energy)
calorie
Amount of energy needed for 1g of water to increase by 1 degree Celsius (1 cal= 1 Cal = 1000 kcal)
Precision
How close a series of measured values are to the actual value/ reproducibility
Total Energy= ?
Kinetic Energy (energy of motion) + Potential Energy (energy of position/ location)
Law of conservation of energy
Energy cannot be created/ destroyed
Accuracy
How close a measured value is to the actual value
Exact #s
0 uncertainty & unlimited sig figs
counting discrete objects, defined quantities (1 cm), integral #s in an equation
Intensive Property
Independent on the amount of substance (density)
