Chemistry lecture week 1 things to learn
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39 Terms
K (kelvin) —-> C (Celcius)
Subtract 273.15
Volume formula
V = πr²h
Radius formula
d (diameter) /2
1 kJ (kilo jule) = _ Jules
1000 J
Nemonic to remember conversions
King Henery Died By Drinking Chocoolate Milk
Kilo Hecto Deca Base Centi Mili
solid —> gas
sublination
gas —> solid
deposition
liquid —> gas
vaporization
gas —> liquid
condensation
diatomic molecules
2 atoms of an element
Frequent Diatomic molecules
H2, Cl2, O2, Br2, F2, I2, N2
Nemonic for reoccurring diaptomic elements
H-Clobber-Fin
Work
energy transfered when a force acts through a distance
Heat
energy transfered from a warmer objectt to a cooler object
endergonic change
energy put in
exergonic
energy released
1st Law of Cnservation
Law: Conservation of Matter/Mass
matter can’t be created or destoyed
total mass of reactants = total mass of products
2nd Law of Consevation
Law: Conservation of Energy
energy can’t be created or destyoed
energy can be trasnferd or converted from one form to another
3rd Law of Conservation
Law: Conservation of Mass and Energy
the total amount of matter and energy in the universe remains constant
matter and energy can be converted into one another, as described by E=mc2
Law of Constant Consumption
All samples of a compond have the same elemental composition by mass
Ex: Amonia NH3. THere will ALWAYS be one nitrogen and 3 hydrogen in ammonia.
Homogonus
Uniform throughout
Heterogeneous
not uniform throughout
Solution
Homogenus liquid or gas, uniform mixture
Alloy
Solid mixture that is homogenus/uniform.
Pure substance are either
elements or compounds
What can a compound do that an element cannot
Be decomposed by a chemical process
Element
contains only one type of atom
What is the atomic number
The number of protons
Atomic mass is?
Protons and neutrons mass added together
Isotopes
The same element with different numbers of neutrons
Atomic number is used to?
identify an element
give the number of protons in an element