# Chem Exam (part 1)

The flashcards below were created by user lduran8 on FreezingBlue Flashcards.

1. Density (d)
• Ratio of mass (m) of an object to its volume (v)
• d= m/v
2. Zeros at the beginning are...
• NEVER significant (place holder)
• 0.0592 (3sf)
3. Zeros at the end after decimal point...
• ALWAYS significant
• 2.00x10³ (3sf)
• 9.6500 (5sf)
4. Zeros at the end without decimal point...
• NEVER significant
• 96,500 (3sf)
• 200 (1sf)
5. Zeros between non-zero digits...
• ALWAYS significant
• 102.3 (4sf)
• 202 (3sf)
6. MASS conversion factors (4)
• kg
• lb
• oz
• g
7. LENGTH (distance) conversion factors (7)
• m
• yd
• ft
• in
• cm
• km
• mi
8. VOLUME conversion factors (5)
m³, ft³, L, gal, qt
9. Precision
• Indicates how repeatable a measurement is
• EX: 253g
•     2.5270, 2.5271,2.5272
10. Accuracy
• Reflects how close the measured value is to the true value
• EX: mass of penny= 2.5267g
•     ->accurate to within 0.0001g of the true value
11. Freezing point (3)
• 32 °F
• 0 °C
• 273K
12. Boiling Point (3)
• 212 °F
• 100 °C
• 373K
13. °F-> °C
°C= 5/9 (°F-32)
14. °C -> °F
°F= 9/5 (°C) + 32
15. °C -> K
K= °C + 273.15
16. K -> °C
°C= K-273.15
17. Zetta
• Z
• 10²¹
18. Exa
• E
• 10^18
19. Peta
• P
• 10^15
20. Tera
• T
• 10^12
21. Giga
• G
• 10^9
22. Mega
• M
• 10^6
23. Kilo
• k
• 10³
24. Hecto
• h
• 10²
25. Deka
• da
• 10¹
26. Deci
• d
• 10^-1
27. Centi
• c
• 10^-2
28. Milli
• m
• 10^-3
29. Micro
• µ
• 10^-6
30. Nano
• n
• 10^-9
31. Pico
• p
• 10^-12
32. Femto
• f
• 10^-15
33. Atto
• a
• 10^-18
34. Zepto
• z
• 10^-21
35. Average Atomic Mass (4)
• Weighted average of all isotopes of an element
• mx= a1m1+ a2m2+ a3m3
• a:natural abundance
• m: mass of isotopes
36. Seven Base Units
• 1.) Mass:kilogram-kg
• 2.) Length: Meter-m
• 3.) Temperature: kelvin-K
• 4.) Time: second-s
• 5.) Energy: joule-J
• 6.)Electrical current: ampere-A
• 7.) Amount of Substance: mole- mol
37. Micro scale units (3)
• Milli (m)= 10^-3
• Micro (µ)= 10^-6
• Nano (n)= 10^-9
38. Micro scale unit conversions (3)
• 1mm= 10^-3m // 1m=1000mm
• 1µm= 10^-6m // 1m= 10^6µm
• 1ng= 10^-9g // 1g= 10^9ng
39. Volume (3)
• derived from length
• Volume= l⋅w⋅h // 1cm⋅1cm⋅1cm=1cm³
• 1 cm³= 1mL= 1cc
40. Density (2)
• Derived from mass & volume
• Density= mass/volume= g/mL= g/cm³= 1lb/gallon
41. Alkali Metals- Group 1 (3)
• Soft, highly reactive
• Form cations- +1 charge
• EX: H+, Cl+, Rb+
42. Alkali Earth Metals- Group 2(3)
• Earth's crust
• Form cations- 2+ charge
• EX: Be^2+, Ca^2+
43. Transition Metals- Group 3-12
• Form cations- various charges
• EX: Cu+, Cu^2+
44. Group 13
• Ionize to 3+ cations (except boron)
• EX: Al^3+, Ge^3+
45. Halogens- Group 17
• form -1 anions
• EX: F-, Cl-, Br-
46. Noble Gases- Group 18 (2)
• Unreactive
• Mono-atomic-> occur by themselves
47. Empirical formula
• Atomic symbols, but smallest whole number ratios
• EX: Glucose: 6C+12H+6O -> CH6O
48. Cation
• (+) ion
• Smaller than neutral atom
49. Anion
• (-) ion
• Larger than neutral atom
50. Naming Binary Molecular Compounds
• First element in the formula is named first
• 2nd element name is changed by adding suffix -ide
• Add prefixes to identify quantity of atoms
51. Matter
Occupies space & has mass
52. Mass
Defines the quantity of matter in an object
53. Energy
Capacity to do work
54. Pure Substance
Same chemical/ physical properties throughout
55. Element
Can't be separated into simpler species by chemistry
56. Compound
2 or more components bonded together that can be broken down into simpler species by chemistry (not physical means)
57. Mixture
Combination of 2 or more pure substances
58. Homogenous Mixture
Uniform components, no visible boundaries
59. Heterogenous Mixure
Not uniform, look different
 Author: lduran8 ID: 315421 Card Set: Chem Exam (part 1) Updated: 2016-02-05 21:51:43 Tags: Chem exam Folders: chem 109 Description: important things to know for the first exam Show Answers: