final review 2013
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Final Review 2013. Chapts 1-2. - PowerPoint PPT PresentationTRANSCRIPT
Final Review 2013
Chapts 1-2
1. a)Hypothesis: tentative answer to a questionb) Control : used for comparisonc)Theory: explanation supported by many experimentsd)Law: relationship in nature supported by experimentse) Independent Variable: one changed by the experimenterf) Dependent variable: one changed because of the independent variable
Review
2a) Safety: -goggles -apron -closed toe shoes -hair tied back
Review
b) -follow directions -report accidents to teacher -place waste in designated containers -know the location of safety equipment -no horseplay
Review
c) Flush with water for 5 minutes
d) Rinse in safety shower (fully clothed)
Review
3. mass- electronic balance volume- graduated cylinder length – metric ruler time- stop watch temperature – thermometer
All measurements should have a NUMBER and UNIT!
SI Units for Measurements
a) Mass – gramsb) Volume – litersc) Length – meterd) Time – secondse) Temperature - ˚C
Accuracy & Precision
Accurate- measurements are CLOSE to the accepted value
Not accurate- measurements are NOT CLOSE to the accepted value
PRECISE – series of measurements close to each other
Reviewc) Percent error:
d) density:
e) quantitative data: numerical data (numbers)f) qualitative data: information describing color, odor, shape etc
Trial Group A Group B Group C
1 1.54 1.40 1.702 1.60 1.68 1.693 1.57 1.45 1.71Average 1.57 1.51 1.70
Accepted value is 1.59 g/ml
5a) Group A most accurateb) Group C precisec) None
% error for Group ATrial Group A Group B Group C
1 1.54 1.40 1.702 1.60 1.68 1.693 1.57 1.45 1.71Average 1.57 1.51 1.70
(1.59 – 1.57) X 100 1.59
= 1.3%
5d)
Scientific Notation
6a) 4.5 x 10-5 = .000045
b) 8.7 x 106 = 8700000
7a) 238,000 = 2.38 x 105
b) 0.00072 = 7.2 x 10-4
2 sig figs
2 sig figs
3 sig figs
2 sig figs
Density
8)
9)
70mL
2100gDensity = 30g/mL
20mL
75g
Density = 3.75g/mL
Density
10) 20/5 = 4g/mL B is the same
11) Read the BOTTOM of the meniscus
Volume is 43.0mL
Graphs13a) Pie graph- percentages b) Bar graph- comparisons
c) line graph- shows how the dependent variable changes with a change in the independent variable
Graphing Rules
1. Title
2. Labeled axes
3. Equal intervals
4. Use up most of the page
5. Use a key if needed
X-axis – independent variableY-axis – dependent variable
Chapter 314) Definitions are in the textbooka) Cutting plastic - physical
b)Rotting meat- chemicalc) water evaporating- physical
d) Dissolving salt- physical
e) Bubbles formed when vinegar reacts- chemical
f) Gold conducting electricity- physical
g) Magnesium burning- chemical
15) bubbles- chemical change ex odor, heat, precipitate
Definitions/examples
16)Element example- Au, Zn, Br etcCompound examples- NaCl N2O5 ZnBr2
17) Particles Energy Shape/vol
Solid tight low definiteLiquid loose medium def vol but
not shapeGas Very
loosehigh Indefinite
Homo vs Hetero
18)Salt water- homo
b)clay and oil- hetero
c) sweet tea- homo d) kool-aid- homo e) vegetable soup- hetero f)chunky peanut butter- hetero
g) muddy water- hetero
Separating Substances
19)Colors in black ink- chromatography b) salt water- evaporation c)sand and water- filtration d)iron filings and sulfur- magnetism f) two different liquids- distillation
Filtration
Distillation
Chromatography
Types of MixturesParticlessize
Tyndalleffect
Settling?
Solution tiny none noColloid small yes noSuspension large n/a yes
Tyndall effect b is a suspension
Atomic Theory Scientists21)USE THE TEXTBOOK – page 103 to 10422) Use the textbook for definitions23) See page 114 of the textbook24) Atomic # is number of PROTONS a) lithium atomic # 3 b) 3 protons and electrons c) sulfur – 16 Protons d) Lithium – 4 neutrons 25)silver-107 47 protons and 60 neutrons26)neutrons = mass – protons = 31 neutrons
57 Fe26
Types of Radiation
27a) Alpha beta gamma b)
c)
4 He2
0 β-1
0 ϒ0
Nuclear Equations
d) 226 222 Ra Rn + 88 86
ii) 14 14 C N + 6 7
4 He2
0 β-1
Fission vs Fusion
28)
• Splitting a heavy nucleus
• Energy produced
• Fusing small nuclei• LARGE amounts of
energy produced• Occurs in the sun• Responsible for all
elements heavier than H
**Cheap source of energy with less pollution than burning coal, however, expensive to build the plant, problems with getting rid of nuclear waste etc
Half- Life
29) Time
(minutes)Amount (g)
0 16518 82.536 41.2554 20.6272 10.3190 5.16
Half- Life
29b)Time
(minutes)Amount (g)
0 10.01 5.02 2.50
Half-Life application30) Using C-14 to determine the age of a fossil
Isotopes
31) Mg-24 contributes the most to the average atomic mass of magnesium (closest to the number on the periodic table), so it is the most abundant in nature.
Weighted Average Atomic Mass
32)
Element X is BORON
Isotope Mass (amu)
% abundance
Mass x %
X11 10.013 .198 1.9826X10 11.009 .802 8.8292
TOTAL: 10.812
Chapter 533) Get definitions from the textbook34) s, p, d, f
b)
Various shapes- spherical, dumbbell etc
Sublevels
c) Sub-Level
# electrons
s 2p 6d 10f 14
Electronic Configurations
35) Li- 1s22s1 [He] 2s1
b) Ne- 1s22s22p6 [He] 2p6
c) Al- 1s22s22p63s23p1 [Ne] 3s23p1
d) Ca- 1s22s22p63s23p64s2 [Ar] 4s2
36) Si
b) F c) Na
Valence Electrons
37) Beryllium (group 2A) - 2 valence e-
b) Nitrogen (group 5A) - 5 valence e-
c) Argon- (group 8A) 8 valence e-
d) Sulfur- (group 6A) 6 valence e-
e) Boron- (group 3A) 3 valence e-
Flame Tests
38) Elements give of distinct colors when heated in a flame. The color of the flame is matched to the known element.
Electron Configuration
39a) 4p1 – Gallium b) 5s2 – Strontium c) 6p6 – Radon d) 7s1 – Francium
40) Same column- similar ending config
Concepts
a) Valence e- is the SAME as the group number
a) Cesium – 1 Nitrogen – 5 Oxygen – 6
c)
d) Period tells you the # of energy levels (rings)
e) s-block (groups 1 & 2) p-block (groups 3A-8A) d-block (transition metals) f-block (lanthanides & actinides)
Cs N O
Periodic Trends
c) Ionization Energy decreases down the group increases across
Lowest IE – Francium Highest IE - Helium
Periodic Trendsd) Electronegativity decreases down the group increases across
Lowest E – Francium Highest E - Fluorine
Periodic Trendse) Metals become SMALLER when they turn into ions
Non-metals become LARGER
Periodic Trends
f) Francium is most active metal. Fluorine most active non-metal.
AKS 11b Trends on Element PropertiesFamily Group# #
valence charge Examples
Alkali 1A 1 +1 LiAlkaline earth 2A 2 +2 CaNitrogen grp 5A 5 -3 PCarbon grp 4A 4 +/- 4 SiOxygen grp 6A 6 -2 Shalogens 7A 7 -1 BrNoble gases 8A 8 0 KrInner trans f-block varies varies Utransition d-block varies varies FeRep elements A elements varies varies O
AKS11b Metal/Nonmetal/Metalloida) Metals left, nonmetals right , metalloids
border the stairstep line. Stairstep line separates metals and nonmetals
c) Metals - shiny, malleable, ductile, conduct electricity, react with acid Nonmetals - mostly gases, dull brittle, do not react with acids, nonconductorsMetalloids - have properties of BOTH metals & nonmetals
d) Metals mostly s and d block Nonmetals and metalloids mostly p block
AKS11b Metal/Nonmetal/Metalloid
Chapter 8 - Ionic Bonding
1. a)
b)
CaCl2
2a) Binary compounds – 2nd element gets “ide” b) Roman numerals used for transition metals that have more than one charge ex Fe2+
and Fe3+
2a) KBr - Potassium Bromide
b) CaCl2 - Calcium chloride
c) SnO2 - Tin (IV) oxide d) Cu(NO3)2 – Copper (II) nitrate
e) Sr(OH)2 – Strontium hydroxide
Chapter 8 - Ionic Bonding
Ionic Bonding question #4
Name Compound Cation Anion Formula B or NB
Lithium Flouride Li+ F- LiF BSilver Oxide Ag+ O2- Ag2O BBarium carbonate Ba2+ (CO3)2- BaCO3 NBGold(III) sulfite Au3+ (SO3)2- Al2(SO3)3 NBCopper (II) hydroxide Cu2+ (OH)- Cu(OH)2 NB
Ionic Bonding
5a) Na2SO4 - Sodium sulfate
b) SnO2 - Tin (IV) oxide
c) FePO4 - Iron (III) phosphate d) Ca(NO2)2 - Calcium Nitrite e) MgCO3 - Magnesium Carbonate f) Al(OH)3 - Aluminum hydroxide g) (NH4)3N - Ammonium nitride
h) AgC2H3O2 - Silver acetate i) Fe3P2 - Iron (II) phosphide
Chapt 9 - Covalent Bonding
6)
Covalent Bonding
7) Binary covalent compounds end in “ide”9) a) PH3 - phoshporus trihydride
b) CCl4 - Carbon tetrachloride
d) NO - Nitrogen monoxide f) As2O5 - Arsenic pentoxide
Lewis Structures
10a) b)
c) d)
e)
Covalent & Ionic Bonding
13 a) MgCl2 – Magnesium chloride
b) NO2 - Nitrogen dioxide c) HF - Hydrogen fluoride d) K3PO4 - Potassium phosphate e) NH4Br - Ammonium bromide
f) Cu(NO3)2 – Copper (II) nitrate
Covalent or Ionic?
14b) tetraphosphorus hexoxide - P4O6
c) aluminum sulfate - Al2(SO4)3
d) Lead (IV) sulfite - Pb(SO4)2 (reduced)