Chem Quiz Chapter 3 Flashcards
Types of Pure substances
elements
compounds
elements
molecules of one type of element
compounds
molecules of 2+ elements
types of mixtures
homogeneous
heterogeneous
mixtures
2+ compounds
homogeneous mixtures
appear to have same composition throughout
heterogeneous mixtures
no uniform composition
solids in terms of shape and volume
definite shape
definite volume
liquids in terms of shape and volume
indefinite shape
definite volume
gas in terms of shape and volume
indefinite shape
indefinite volume
physical property
observable/measurable characteristics
chemical property
ability of a substance to interact with others and/or change into another
physical change
change in state/physical shape
chemical change
change in composition/identity
signs of chemical changes
bubbles, gas, change in color
energy
ability to do work
kinetic energy
energy of motion
potential energy
stored energy
thermal energy
energy released as heat
associated with temperature
heat
transfer of kinetic energy
associated with particle movement
units for heat in metric system
calories
units for heat in SI system
Joules
1 Calorie is how many calories
1,000 calories
1 calorie is how many Calories
10-3 Calories
what is the definition of a calorie
the heat needed to increase the temperature of 1 g of a substance by 1 degrees C
1 calorie is how many Joules
4.184 Joules
K -> C
C = K -273
C -> K
K = C +273
C -> F
F = 1.8C +32
F -> C
C = (F-32)/1.8
Specific Heat =
q / (m x deltaT)
Definition of specific heat
energy needed to heat up 1 gram of substance by 1 degree C
what does q represent in SH equation
heat
calories = metric
Joules = SI
1 Cal = ? kCal
1 kcal
