Chem Test 1
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Chem Test 1
Chemistry test 1
What is the order of units from large to small?
Kilo - Hecto - Deca - UNIT - Deci - Centi - Milli
1 m = in
1 m = 39.37 in
1 in = CM
1 in = 2.54 cm
i km = mi
i km = 0.62 mi
1 l = qts
1 l = 1.06 qts
1 gal = qts
1 gal = 4 qts
1 lb = g
1 lb = 454 g
1 kg = lbs
1 kg = 2.2 lbs
Freezing point of H2o in f?
Boiling point in F?
Freezing point in C?
Boiling point in C?
Convert C to F?
F = 9/5C + 32
Convert F to C
C = 5/9 (F-32)
What point does F = C?
-40F = -40C
M = d x V
what is exponential notation?
= 10 x 10 = 100
= 1/10x10 = 0.01
How many elements are there? How many naturally? How many non metals?
114 elements, 90 = naturally, 24 = non metals
What is a metal?
Shiny solids that are good conductors of heat and electricity. All metals are solid at room temp (except for Mercury).
What is a non metal?
No shiny appearance, poor conductors of heat and electricty, solid or gas
What is a metalloid?
How many and what are they?
has properties between metals and non metals.
7 metalloids: Buron, germanium, silicaon, arsnic, antimony, tellurium, astatine
What elements make up 96% of human body?
Oxygen, carbon, hydrogen, nitrogen
What is the atomic #?
number of protons
What is the mass number?
# of protons + # of neutrons
What is the atomic weight?
average of the mass of naturally orrcuring isotopes of a particular element reported in AMU
How do you find atomic weight?
1. List each isotope and % it occurs in nature
2. mulitply % by AMU
What is a row called?
What is a column called?
What is a shell?
numbered, n = 1, 2, 3, 4
2, 8, 18, 32 = # of elecrtons in each SHELL
What are the orbitals? How many electrons can they hold?
s, p, d, f
each orbital can hold 2 electrons
What is ground state?
the lowest energy arrangement of an electron
When does the size of the atom increase?
Down a column, valence electrons are farther from nucleus
When does the size of atom decrease?
Accross a row as number of prodons in nucleus increase, the increase # of protons pulls the elecrons closer to nucleus, smaller atom.
When does ionization energy decrease?
Down a coumn as the valence e gets further from nucleus
When does ionization energy increase?
Accross a row, as protons increase
What is ionization enegry?
The energy needed to remove a e from a neurtal atom
What is a cation?
positively charged, has fewer electrons than a neurtal atom
Who created atomic theory?
John dalton, 1800s
Smallest part of a compound that is capable of a stable independent existance
What is a diatomic molecule?
what are they?
a molecule that can be a single atom
What is a monotonic molecule? What are they?
Will not combine with anything else
He, Ne, Ar, Xe, Rn
Who discovered the elecrton?
JJ Thompson 1897 england
Who discovered the proton?
Rutherford - gold foil experiment
protiens mass = 1 amu
Who discovered the neurton?
What binds the nucleus together?
What is the atomic #?
identifies the element
# of protons which is equal to # of elecrtons
What is an isotope?
Different form of the same element which differ in mass number b/c of different # of neurtons
Level 1 = ?e-
1 = 2e-
2 = 8
3 = 18
4 = 32
What is a quantum number?
Determines the energy of electron and where they will be found
What are the 4 quantum numbers?
1. principle (n) major energy levels 1-7
2. Secondary (l) refers to shape
3. magnetic (m) - # of shaped orbital possible in an energy level
4. Spin (s) each orbital may hold a max of 2 electons provide tehy have opposite spin
what is hunds rule?
An elecrton will resist pairing up in a space orbital until is its forced to do so
Max # of elecrtons in s, p, d, f?
Spectroscopic notation? how to arrange?
3s 3p 3d
4s 4p 4d 4f
5s 5p 5d 5f
6s 6p 6d 6f
7s 7p 7d 7f
How to find orbital notaion?
find the highest energy level,
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