4/17/2012 Standards : 7 (Chemical Thermodynamics) Ob jectives :
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Transcript of 4/17/2012 Standards : 7 (Chemical Thermodynamics) Ob jectives :
4/17/2012 Standards: 7 (Chemical Thermodynamics)
Objectives:● Be able to calculate Specific Heat Problems involving use of J/gºC DO NOW: 1. Vocab words on p. 489 – write definitions and explain as best you canHOMEWORK: 1. SN Ch 16.1 p. 216-218 (2 pts) Std 7 2. Ch 16.1 PP's p. 492 & 494 PP's 1-6 (show calcs, do not use formula in
book) (3 pts) Std 7 3. Watch all 4 videos in #3. Problems 4 & 5 worked out in detail. 4. You may want to watch the conductivity demo I did last week at the
link in #4 of HW page===========================================================STAMPS: NONE
Specific Heat
Textbook p. 492Table of Specific Heat for several elements
Density - Problem Types (3)
1
2
3
Specific Heat - Problem Types (4)
1
2
3
4
Starting fraction if we are finding J Starting fraction if we
are finding g or deg C
4/18/2012 Standards: 9 (Chemical Equilibrium) Objectives:● Be able to calculate problems using specific heat without the formula
q = c x m x ΔT● Energy of Activation keeps most reactions from being spontaneous (thermite). ● Catalysts lower the energy of activation (vid. energy req'd to start reaction). ● Be able to write equilibrium expression for reactions.DO NOW: 1. What do each of the letters mean in this equation? q = c x m x ΔT see p 493 2. Define joule (J), calorie (cal), heat, chemical potential energy HOMEWORK: 1. Ch 18.1, PP's p. 565-568 1 (a-c), 2 (a-c), 3, 4 (2 pts) Std 9 Ch 18.1 Assess, p. 591 52 (a-b), 53 (a-b), 55, 56 (3 pts) Std 9 2. CST 80-90 (non-calc probs - correct ans, reason, p. #, calc probs show given,
find and calcs (5 pts) Std MISC=========================================================STAMPS: ● Journal 4/17 1. SN Ch 16.1 p. 216-218 (2 pts) Std 7 2. Ch 16.1 PP's p. 492 & 494 1-6 (3 pts) Std 7
RESPONDERS
Staple all papers Please
http://www.sciencegeek.net/Chemistry/taters/CST.htm
CST Released Questions - on-line interactive
Both links on today's HW page
http://mrwiggersci.com/chem/TestsQuizes/CST-prep/STAR-chem-2010.pdf
also know as kcal
big CAL
density = mass volume
mass volume
volume mass
if find = mass if find = volume
start calcwith this
start calcwith this
1 The find is _____________What will start your calc. ?
A
B
mass volume
volume mass
density problems
specific heat = J g°C
J g°C g°C
J
If find = Jif find = gif find = °C
start calcwith this start calc
with this
specific heat = J g°C
J g°C g°C
J
If find = J if find = gif find = °C
start calcwith this
start calcwith this
2 Where will the 2.15 be?
A Top
B Bottom
3 The find is _______ .Which will start you calc?
A
B
J g°C
g°C J
aA + bB cC + dD ------> ------>
Keq =
[A]a [B]b
[C]c [D]d
Guided PracticeWrite Keq equilibrium constants for these equations
__C(s) + __H2O(g) ------> __CO(g) + __H2 (g)
__FeO(s) + __CO(g) ------> __Fe(s) + __CO2 (g)
Keq =
Keq =
__SO3(g) + __CO2(g) ------> __CS2(g) + __O2 (g)
4/19/2012 Standards: 9 (Chemical Equilibrium) Objectives:● Equilibrium Reactions are reversible● Be able to write Keq EXPRESSIONS ● How to calculate the numerical value of Keq ● hetero- vs homogeneous equilibria DO NOW: ( use handouts to find answers to these ) 1. How do we define chemical equilibrium? What is it’s stylized equation/
equilibrium expression? (yesterday's handout, 2nd page at top) 2. What does homogeneous equilibrium mean (today's handout)?HOMEWORK: 1. CST 1-10 (5 pts) Std: MISC
if no calcs needed give page# from book and brief explanation. For non calc, if great explanation, no page # not required.
2. Ch 18.1 Assess p. 568 6,7,9 Ch 18.2 Assess p. 574 10, 11 (a-c), 12 (a-c), 13 (an exothermic reaction where heat is a product) (a-c)
=========================================================STAMPS: ● Journal 4/18 1. Ch 18.1, PP's p. 565-568 1 (a-c), 2 (a-c), 3, 4 (2 pts) Std 9 Ch 18.1 Assess, p. 591 52 (a-b), 53 (a-b), 55, 56 (3 pts) Std 9 2. CST 80-90 (non-calc probs - correct ans, reason, p. #, calc probs show given,
find and calcs (5 pts) Std MISC BASKET
BLACK TRAY
4 The find is _______ .Which will start you calc?
A
B
J g°C
g°C J
specific heat = J g°C
J g°C g°C
J
If find = J if find = gif find = °C
start calcwith this
start calcwith this
5 Where will the 2.15 be if find? ____________
A Top
B Bottom
Specific Heat =
aA + bB cC + dD ------> ------>
Keq =
[A]a [B]b
[C]c [D]d
http://www.mhhe.com/physsci/chemistry/essentialchemistry/flash/lechv17.swf
Interactive Applet to view for yourself what happens during equilibrium shifts (link in HW page tonight.
Guided PracticeWrite Keq equilibrium constants for these equations
__C(s) + __H2O(l) ------> __CO(g) + __H2 (g)
__FeO(s) + __CO(g) ------> __Fe(s) + __CO2 (g)
Keq =
Keq =
__SO3(g) + __CO2(g) ------> __CS2(g) + __O2 (g)
BLACK TRAY
4/20/2012 Standards: 9 Objectives:● Review HW, Keq expression, and figuring value of Keq ● LeChatelier - factors that cause “stress” to equilibria - conc., pressure, & temp. DO NOW: 1. Zumdahl Equilib. probls (handout): 26 (a-c) answer on your own paper. HOMEWORK: 1. Zumdahl Equilib. probls (handout): 35 (a-c), 36 (a-e) (5 pts) Std 9 2. CST problems 11-20 (5 pts) Std 9 ====================================================STAMPS: ● Journal 4/19 1. Ch 18.1 Assess p. 568 6,7,9
Ch 18.2 Assess p. 574 10, 11 (a-c), 12 (a-c), 13 (a-c)(an exothermic reaction where heat is a product)
2. CST 1-10 (5 pts) Std: MISC BASKET
Starting today
JournalsWrite date to left of the "margin line" on your paper
----- penalty - no stamp
HomeworkWrite problem # to the left of the "margin line". If there are a, b, c, etc parts of the problem, write those to the left of the "margin line"
----- penalty - 1/2 credit for HW
4/26 (next week)Starts 7:00pm
Keq =
[N2] [Br2]3
[NBr3]2
Demo equilibrium CoCl2 (aq)
CoCl42- (aq) <===========> Co2+ (aq) + 4Cl1- (aq)
BLUE PINK
Problems 26 (a-c), 33 (a-c) & 34 (a-c) of "Equilibrium Probs from Zum Text".
Problem 26 - follow directions in the problem for a-c. Do these problems on the "LeChat Prob form for ans" (2nd printer icon).
Problems 33 and 34 you must use the chart "LeChatelier Problems - format for answers"