# Chemistry

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1. X0
1
2. X-a
1/Xa
3. Exponential Notation
Less than one or greater than 10
4. Scientific Notation
Between 1-10
• When multiplying numbers with exponents, add the exponents.
6. Dividing Exponent Numbers
Subtract the exponents
7. SNEL
• Shortest Number Extreme Left
• Us for Multiplication and Division
8. Xa
1/X-a
9. Adding and Subtracting Exponent Numbers
• Make them match and bring them down
• Make exponents match by choosing one number to remain the same, manipulate the other accordingly. Final answer will have shared exponent.
• Shortest Number After Decimal
• Use with adding and subtracting exponent number
• 1) Determine Shortes # (Beads)
• 2) Draw the lin after the decimal equal to the # of beads
• 3) Round as needed
11. Rounding with SNEL and SNAD
• If it is Odd- ADD (Round UP)
• If it is Even- L'Even (Do Nothing)
12. Multiple Step Problem with Exponents
Including +, -, x, /
• Do all steps as usual
• Determine SNEL based on all numbers in final answer- choose shortest
• Complete SNEL on final answer
• Do not include any certain numbers (Whole #)
13. Interpreting Equations
• (a)= (b)/c
• Direct Relationship--> across from each other, seperated by =
• Move together

• (A)= B/(C)
• Indirect Relationship
• Move opposite
14. Logorithim
• Logical Arithmatic
• Exoponent
15. PEMDAS
Please Excuse My Dear Aunt Sally
( ), Xx, X, /, +, -
16. Intrinsic
• Does not rely on size of sample
• Color, Ratios, Temperatures
17. Periodisity
Repeats self in a predictable manner
18. Group 1A
Alkali Metals
19. Group 2A
Alkali Earth Metals
20. Group 7A
Halogen
21. Group 8A
• Rare Inert Noble Gases
• (RIN)
22. Periodict Table Columns
Groups
23. Periodic Table Rows
Period
24. Z
• Atomic Number
• Whole Numbers (Integers)
• Number of protons and electrons
25. A
• Atomic Mass Number
• Average of all isotopes
26. Metals
To left of Staircase
27. Nonmetals
To right of stair case
28. Metaloid
• On the staircase (but not in front of)
• Sometimes acts like and resembles a metal
29. Chemical Reactivity
• Based on electorns in outermost shell
• # of electorns in outermost shell is stated by Group Number (1 in 1, 2 in 2, etc.)
30. Picometer
• 10-12
31. Otet Rule
• I will bond with someone if I can get 8 Electrons in my outer most shell.
• 1A bonds with 7A
• 2A bonds with 6A
• 8A does not bond as it is complete (NOBLE gases)
32. 2n2
• How to determine the number of electrons on each ring
• Ne- Group 8A
• 8 rings
• Ring 1: 2(1)2= 2 electrons
• Ring 2: 2(2)2= 8 electrons
• Ring 3: 2(3)2= 18 electrons
33. Covalent Bonding
• Sharing Electrons
• Weaker bond
• California
34. Ionic Bonding
• Very strong
• Opposit charges attract like magnets
• Transfering of electrons (stealing electrons)
• Brooklyn Bonding
35. Ion
• Run in Greek
• Change in balance of electrons and protons
36. Isotope
Atoms having same atomic # but different mass # because they have a different # of neutrons in the nucleus.
37. Cations
+ charged

• Electron leaves, becomes positively chargedmes positively charged
• Smaller than an atom
38. AnIons
• (-) charged
• Gain an Electron
• Larger than an atom
39. Pupose of Neutron
Buffer the destructive properties of protons and electrons.
40. A-Z=N
(Atomic Mass Number) - (Atomic Number)= number of Neutrons
41. Find Atomic Mass #
• 1) Multiply mass # by weighted percentage (must all add up to 100)
• 2) Add the mass numbers (result of multiplication)
• 3) Divide total by 100
• 4) Perform SNEL on final number
42. Mole
6.02x1023
43. Oxygen bonding
2 bonds and 2 lone pairs
44. Significant Figures
• Digets recordered in measurement (certain or uncertain)
• 0 before decimal point are significant
• 0 are NOT significant without decimal point
45. Precision
How close measurments are in a series to one another
46. Accuracy
How close a measurement is to actual value
47. Molecule
Independent structure consisting of 2 or more atoms chemically bound together
48. Compound
matter composed of 2 or more elements that are chemically bound
49. Mega-
• M
• 106
50. Kilo-
• k
• 103
51. Centi-
• c
• 10-2
52. Milli
• m
• 10-3
53. Mole of amu
• 1 gram
• grams/ mole= amu
• measurement of chemicical protions
54. Micro
• u
• 10-6
55. Molecular Weight