Cooling+and+Heating+Curve+Lab+v2
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Name Date Cooling and Heating Curve Lab Pre-lab Questions 1.
Describe the setup of the glassware seen in the video. (5 points) 2.
What color is lauric acid normally? Why is the lauric acid colored blue? (2 points) 3.
Why was the lauric acid initially melted? (3 points) Part A 4.
Use the video to determine the temperature at each of the times that are given. (20 points) Data Table 1: Cooling of Lauric Acid Time (minutes) Temperature (
o
C) 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0 10.5 11.0 11.5 12.0
5.
Create a scatter plot graph of the cooling curve of lauric acid. Graph time on the x-axis and temperature on the y-axis. Upload your graph with your lab. (10 points) 6.
Based on your graph, what is the freezing point of lauric acid? (5 points) 7.
Is the cooling of lauric acid an endothermic or exothermic process? How do you know? (5 points) Part B 8.
Record the temperature of the lauric acid as it is melted in the data table below. (20 points) Data Table 2: Heating of Lauric Acid Time (minutes) Temperature (
o
C) 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0 9.
Create a scatter plot graph of the heating curve of lauric acid. Graph time on the x-axis and temperature on the y-axis. Upload your graph with your lab. (10 points) 10.
Why is the lauric acid stirred while melting? (2 points)
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Related Questions
• Stock solution: 1000 mg/L
Target sample concentrations: 50-400 mg/L
• Create a 5-point standard dilution to cover the test
• If each test only needs 10 mL, make plans to make the dilution so you
have 20 mL of each concentration.
·
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Think about the situation where you are investigating the relationship of study time vs. exam grade.a. Which variable would be on the x-axis (and why)?b. Which variable would be on the y-axis (and why)?c. Would you expect the slope to be positive or negative (and Why)?
2) Contrast and compare interpolation with extrapolation. Which is “safer” to use and why?3) Look up how “the best fit straight line” is constructed. The term “Least squares” should be in your explanation.4) If I plot some data and end up with a r2 of (-) 0.99, is my plot useless? Explain.
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You were tasked to check if the liquid sample you have is a substance or a mixture.
Which among these tasks is the BEST way to do so?
Color comparison
Taste comparison
Boiling Test
Melting Test
1.
I.
II.
IV.
C. I, Il and IV only
D. II and IV only
A. I, II, III, IV
B. I, II and III only
2. A liquid has the following properties: one-phase, colorless, boils at varying
temperature. Which of the following BEST describes the liquid?
A. solution
B. substance
C. suspension
D. heterogeneous mixture
Jill has an unopened box of a 2-meter foil labeled as 100% aluminum. Jill takes just a
thumb-sized piece of the aluminum foil. Which of the following statement is TRUE
about the piece of aluminum foil that Jill took compared with the rest that was left in the
box?
3.
A. Its mass and melting behavior are different.
B. Its mass and melting behavior are the same.
C. The mass is different, but the melting behavior is the same.
D. The mass is the same, but the melting behavior is different.
4. Which of…
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Posttest
Direction. Read the questions carefully. Write the letter of the correct answer.
1. Water exists in three states of matter and continuously moving through a cycle
on Earth. At which stage in the water cycle does water transform from a gas to a
liquid?
a.evaporation
c. precipitation
b. condensation
d. Sublimation
2.
Carbon dioxide (CO2) forms when coal burns in the presence of oxygen. Which
of the following is the BEST evidence that a chemical reaction occurs when the coal
burns?
a. Production of mechanical energy c. A new substance is produced
b. Production of electricity
d. Formation of precipitate
3.Which of these does NOT happen during a chemical change?
a. New substances are formed with different chemical properties.
b. Attractive force between atoms of molecule formed or break.
c. The chemical properties of the substances before and after the reaction are
the same
d. Energy is always released or absorbed.
4. A granular substance is added to a liquid. Which of the…
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LAB :DETERMINATION OF ALCOHOL CONCENTRATION IN WINE by distilling
1. How can we know that all the alcohol has distilled away from the wine? Explain.
2. Generate a graph “Temperature vs Volume of Distillate”. Was the temperature constant during distillation ? Explain why it should be so or not so
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Color BEFORE adding
Color AFTER adding
Intensity of color AFTER
adding FeCl3
Test Tube #
FeCl3
FeCl3
#1 (salicylic acid)
clear
lilac
100%
#2 (commercial aspirin A) clear
slightly pink
50%
#3 (commercial aspirin B) clear
lilac
95%
#4 (aspirin from your
clear
pink
20%
synthesis above)
#5 (control)
clear
clear
0%
Based on this data and the melting point of Aspirin, how pure is the synthesized product?
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Please complete answers than rating helpful other wise un helpful 6 and 7
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Home
Tools
Lab Experiment #... x
...
+)
玩,
1
| 2
97.4%
Record
your
observations following each reaction including changes in color and state of matter.
AGNO3 (Ag*)
Pb(NO3)2 (Pb²*)
Ca(NO3)2 (Ca²+)
а
e
i
NazCO3
Light orange solid
white, cloudy solid
white, cloudy, solid
(СО2)
b
NaOH
f
dark brown solid
stay clear, liquid
white, cloudy solid
(OH)
g
k
NazSO4
stay clear, liquid
white, cloudy, solid
white, cloudy, solid
(SO?)
d
NaCl
1
white, cloudy solid
white, cloudy solid
stay clear, liquid
(CF)
....
Remember to complete and submit this table to your instructor before the end of the class session.
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Multiple Choice
Each of the numbered items or incomplete statements is followed by answers or by completions of the statement.
Select the one lettered answer or completion that is best in each case. Write your answer before each number.
60. What is/are the purpose/s of heating sodium carbonate in 270°C for one hour before using it in the
standardization of hydrochloric acid?
1. To remove carbon dioxide that is generated during the neutralization reaction
II. To remove moisture
III. To convert sodium barbonate to sodium bicarbonate
a. I, II and III
C.
I only
b.
II only
d.
II and III
61. The process by which the exact concentration of a solution is determined:
a.
Dissolution
C.
Standardization
Titration
b.
Neutralization
d.
62. The function of Quality Control include the following, except:
a.
C.
Analytical control
Planning
b. Auditing
d.
Inspection control
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This question has multiple parts. Work all the parts to get the most points.
Use the References to access important values if needed for this question.
18
16
14
12
10
8
6
4.
Choose the correct relationship for the plot shown above.
O a direct proportion
O an inverse proportion
O linear with a positive slope and nonzero y-intercept
O linear with a negative slope and nonzero y-intercept
Submit
Cengage Learning | Cengage Technical Support
MacBook Air
DII
E5
F6
EZ
FA
F9
F10
F
2$
&
*
)
4
5
6
7
8
* 00
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5. Which tablet size and the liquid combination resulted in the fastest dissolution times?
A. crushed, room temperature water
B. crushed, hot water
C. crushed, room temperature vinegar
D. broken, hot water
E. broken, room temperature vinegar
6. What is the relationship between particle size and the time it takes for the tablet to dissolve?
A. direct proportion
B. inverse proportion
C. combined proportion
D. joint proportion
7. Using the activity as a model, how does mechanical weathering (breaking or crushing) contribute
to chemical weathering (dissolution)?
A. Increases size of particles
B. Decreases dissolution time
C. Increases surface area
D. Both A and B
E. Both B and C
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Time (min
The investigator used one of the following substances in this experiment.
Melting and Boiling Points of Four Substances
Melting Point Boiling Point
(°C)
Substance
(°C)
1
20
100
40
140
3.
70
140
80
160
Which of these substances was used in this phase change investigation?
A. Substance 2
B. Substance 4
C. Substance 3
O D. Substance 1
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In the titration of NaOH with vinegar, a student overshot the endpoint (i.e. added too much NaOH solution). How will this affect the calculate percent acetic acid in the vinegar?
percent will be too high
percent will be too low
no effect on the percent
ding of this buret?
21
Click Save and Submit to save and submit, Click Save All Answers to save all answers.
Save All Answers
Cle
80
000
000
DII
DD
F1
F2
F3
F4
F5
F6
F7
F8
F9
F10
#
&.
%24
20
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Concentration (mg/ml)
Time (min)
8.5
0.5
6.8
5.4
1.5
4.0
2
3.2
2.5
2.5
3
What will be the slope of the line using the given first and second values?
What will be the y-intercept, still using the given first and second values?
Completely state the equation of the line.
nlcot olN5
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Activity 3
Direction: Match the following processes with their descriptions.
1. Storage
a. Some chemicals are added to the
water that will make the dirt and some
2. Sedimentation
dissolved particles to stick together
3. Filtration
b. Water is placed here before it is
transported to your house
4. Disinfection
5. Coagulation
c. Flocs start to get really heavy and sink
6. Aeration
to the bottom of the tank where they
can be removed
d. Water flows slowly through this
section made up of layers of sand,
gravel, and charcoal
e. Water and air in close contact in order
to remove dissolved gases and metals
f. Chlorine is added
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Catra wanted to determine the concentration of copper(II) chloride at an unknown concentration .She began by trying to determine the value of epsilon (ε) using beers law for copper(II) chloride. Catra remembered in lab when they wanted to solve for epsilon they would test the absorbance for three different concentrations of a known solution and then graph it. Catra got frustrated and asked Shera what to do next to determine epsilon. What should Shera tell Catra?
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All changes save
7. When two solutions are mixed, a color change occurs. The data tables show the time between mixing and the color change for two sets of conditions. For
Condition One, the solution concentrations were constant and temperature varied. For Condition Two, the temperature was constant and concentrations varied.
Condition One: Concentration
Time for
Temperature
(°C)
Sample
Color to
Change
1
10°
36 sec
22°
14 sec
Condition Two: Temperature
Time for
Concentration
Sample
Color to
%
Change
1.
100%
15 sec
2.
50%
24 sec
Which of these statements is true according to the data?
O The reaction rate is greater at 22°C than at 10°C.
O Reducing the temperature increases the rate of the reaction.
The reaction is affected by changes in temperature
not by changes in concentration.
O Decreasing the concentration increases the reaction rate.
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Dipping into health
When blood pressure is measured over a 24-hour period, this is referred to as ambulatory blood
pressure monitoring, three patterns arise. Here are samples of three different individual.
Let's call them Dick (1), Tom (2) and Harry (3).
1
2
3
Patient's
Paticnt's
BP
BP
Palicet's
Upper
limit
Upper
limit
12
Upper
lim
124
120
Lower
limit
Lower
Lower
limit
Time (houn after wakening)
Time (hours after awakening)
Time (hours after awakenin
SYSTOLIC BP (mm Hg)
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PRODUCT
REFRACTOMETER
%SUGAR
CONCENTRATION
FRUIT COCKTAIL
10oB
using refractometer, how to solve the % of sugar solution?
(please indicate the solution and formula)
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A group of students performed a melting point experiment to study the physical properties of ionic and covalent solids. The data collected are shown in the table.
Solid Sample
Melting Point (oC)
Time Elapsed (min)
Table Sugar (sucrose)
186
18
Table Salt (sodium chloride)
500 (not observed)
30
Paraffin Wax
37
4
Vegetable Lard
50
>5
Using the information contained in the table, what is the BEST explanation for the results?A The melting point of sodium chloride was not observed because ionic solids do not melt, whereas sugar, wax, and lard melted because they are softer than salt.B The melting points of covalently bonded solids tend to be lower than ionic solids. The melting point of sucrose was greater than the wax or the lard because sucrose has stronger bonds than wax or lard.C The melting point of sodium chloride was not observed because ionic solids are composed of positive and negative ions that do not melt; whereas, the…
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What is the main purpose of recrystallisation? A. Chemists recrystallise solids when they want to change big crystals into small crystals. B. Chemists recrystallise solids that are contaminated with impurities. If done properly, the solid will then recrystallise in a purer form. C. Chemists recrystallise solids when they want to change small crystals into big crystals.
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Why is NaOH(s) to be taken out and weighed only when you are ready to make measurements?
Group of answer choices
NaOH does not need special treatment.
NaOH reacts violently so is prepared last.
NaOH is hygroscopic
NaOH burns holes in the weighing paper.
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Hi! Can someone please help me with these 2 questions? Thanks so much!!
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Routine Chemical Tests for Urine - Word
Table Tools
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COLLEGE OF HEALTH SCIENCES
RESULTS AND OBSERVA TIONS:
PARTI: BENEDICTS TEST FOR REDUCING SUGARS
田
TUBE
PATIENT
COLOR
RESULT and
NO.
Before: Blue-green
OBSERVATION
WHITE PRECIPITATE:
1
Normal Patient 1
After: Greenish brown
2
Normal Patient 2
Before: Blue
LIGHT GREEN
After: Green
PRECIPITA TE:
3
WHILTE AND YELLOW
Pathologic Patient 1
Before: Blue
PRECIPITATE:
After: Green
BRICK RED
Before: Blue-green
After: Brick Red
Pathologic Patient 2
PRECIPITATE:
Generalization:
Page 5 of 8
947 words
English (Philippines)
K…
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A vehicle's cooling system is being
discussed. Technician A states that engine
coolant should not be mixed at a ratio higher
than 65% coolant and 35% water. Technician
B states that a 50% coolant and 50% water is
adequate for most climates. Who is correct?
Select one:
a. Technician A only
b. Technician B only
c. Both Technicians A and B
d. Neither Technician A nor B
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Plz help quickly
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Current Attempt in Progress
From the curves shown in Animated Figure and using the following Equation, determine the rate of recrystallization for pure copper
at the several temperatures. Make a plot of In(rate) versus the reciprocal of temperature (in K-1). (a) Determine the activation
energy for this recrystallization process. (See Section FACTORS THAT INFLUENCE DIFFUSION.) (b) By extrapolation, estimate the
length of time required for 50% recrystallization at room temperature, 20°C (293 K).
(a) i
kJ/mol
(b) i
days
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HELP #8 . The second image shows what I put and I got it wrong.
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C. Identify the method for the separation of the following mixtures:
1. Kerosene in water
2. Iron fillings and wood shavings
3. Water and alcohol
4. Salt solution
5. Powdered chalk in water
6. Soil with gasoline
7. Crude oil processing to separate diesel from gasoline
8. Blood components
9. Sand and water
10, oil and water
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SERIAL DILUTION: PROBLEM SOLVING. Set up five (5) tubes on the test tube rack and label them 1-5. Place 0.9 ml of saline to tube #1 and 0.5 ml of saline to tubes # 2-5. Add 0.1 ml of patient's serum to tube #1, mix and transfer 0.5 ml of the mixture to tube # 2. Then, mix and transfer 0.5 ml of the mixture to tube # 3. Mix and continue dilutions through tube # 5. Discard O.5 ml from tube # 5. Finally, add 0.5 ml of the reagent to each tube # 1-5. Compute for the initial dilution of tube #1 and final dilution of tube #5. Show your computation and encircle your final answer.
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