Chapter 3 Flashcards
STUDY FOR FUCKING EXAM
T or F- a pure substance has constant composition
T
can an element be broken down?
no
can a compound be broken down?
yes
what is a mixture composed of?
two or more types of matter
what type of mixture is uniform throughout and components can not be seen?
homogenous
what type of mixture does not have uniform composition and components appear as separate?
heterogenous
what out of the two are heterogenous? concrete or air
concrete
what out of the three are homogenous? air, water, or ranch
air
what out of the two is an element? copper metal, or bronze (mixed metal)
copper metal
what out of the two is a compound? table salt or oxygen
table salt
definite shape/volume
solid
definite volume/ NO definite shape
water
NO definite volume or shape
gas
physical properties change but identity stays the same
physical change
substance is converted into a new substance
chemical change
chemical or physical change? cooking an egg
chemical
chemical or physical change? water freezing
physical
chemical or physical change? rust
chemical
chemical or physical change? sugar dissolved in water
physical
chemical or physical change? sugar heated into caramel
chemical
equation for converting Tf to Tc
Tf-32/1.8
conversion factor for cal and joules
1 cal.4.184 J
calculate the heat released when 100g of water (c=4.18J/gC) inside a calorimeter changes temp from 25 to 50C
10450J
assuming blood has the same specific heat as water, calculate the heat lost when a child with 3000g of blood is put in an ice bath and cooled from 39.4 to 36.8*C (list both Js and kJs- formate xJ or xkJ)
-3260.4J or -32.6kJ
