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Flashcards in SAT CHEM Deck (20):
1

Units of Pressure

760 torr = 760mmHg = 1 atm

2

Units of Energy

calories (cal) and joules (J)

3

Breaking bonds _______ energy

Requires

4

Forming bonds _______ energy

Releases

5

Specific heat def

The amount of heat to raise the temperature of 1g of a substance by 1 degree Celsuis

6

q=

m (mass )* c (specific heat) * delta T (change in temperature)
*Use Celsius*

7

Diatomic Elements

Oh I Have Nice Closets For Brooms
O I H N Cl F BR

8

Avogadro's Number (Mole)

6.02*10^23

9

1 amu

1/12 mass of C-12 a.k.a 1g

10

convert from mass composition to the empirical formula

1. convert percent into 100g: 50% = 50g
2. Convert to Moles
3. Divide by smallest mole and round to nearest integer to get ratio

11

Entropy

Measure of disorder
The higher the entropy and the lower the energy the more stable it is
Symbolized by delta S

12

Enthalpy

Direct relationship between enthalpy and energy
Universe like low enthalpy and high entropy
Symbolized by H
When delta H is negative it is exothermic and enthalpy decreases therefore occurs more often
When delta H is positive it is endothermic and enthalpy increases therefore doesn't occur as often

13

Heat of Formation

Symbolized by delta H subscript f
If negative heat is released and vice versa when it is positive
Elements have a heat of formation of 0

14

Hess's Law

delta H will be equal to the sum of the enthalpy changes in individual steps whena reaction occurs in more than one step

15

Gibbs' Free Energy

delta G = delta H - T*delta S
Temperature is in Kelvin
When delta G is negative occurs spontaneous in forward reaction
When delta G is positive occurs spontaneous in reverse reaction
When delta G is 0 occurs reached equilibrium

16

Electrons exist in _________

Orbitals

17

Electrons farther away have _________ energy than those closer to the nucleus

greater

18

Sub-shells: Number and Shape

s: 1 spherical
p: 2 dumbbell
d: 5
f: 7
Any orbital can hold a maximum of 2 electrons

19

Principle Quantum number (n)

Distance from nucleus
Ex: First energy shell: n=1

20

Azimuthal Quantum number (l)

s: 0