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Designing a Handwarmer Research laboratory Report (AP Chemistry)

Laboratory 5

Julia (hour 2)

TITLE: INVESTIGATION – Hands Warmer Design and style Challenge: Wherever does the temperature come from? PURPOSE:  to decide which from the 3 ionic compounds (NaCl, LiCl, or perhaps NaCH3COO) is quite suitable for use as a hands warmer�

TREATMENT:

DAY you (Part two only):

1) Measure out 2 independent samples of 90. 0 cubic centimeters of unadulterated water

2) Heat person to about 50˚C, and place different one in calorimeter (at around 20˚C)

3) Add heating unit water to calorimeter, cover top, hold out 15 seconds, assess temp

4) Repeat

TIME 2:

1) measure 40mL of unadulterated water into a styrofoam cup on mix plate 2) record temp of drinking water

3) assess out about 4g of salt

4) add to drinking water and mix

5) record temp following 1 tiny

6) repeat with the remaining portion of the salts Craigslist

7) repeat for next trial

MSDS NaCl:

Can be irritating to eyes, cause skin discomfort, may cause discomfort of respiratory system

tract upon inhalation, or perhaps ingestion may cause gastrointestinal discomfort, nausea,

throwing up, and diarrhea. No ecological information obtainable. Dispose since

hazardous spend.

LiCl:

Can be irritating to eyes and skin, could possibly be harmful if perhaps ingested leading to irritation

of respiratory tract, ingestions could cause gastrointestinal irritation, nausea,

vomiting, and diarrhea. Can also cause central nervous system effects,

Lab 5!

Julia (hour 2)

mutagenic results, impair fertility, liver and kidney injuries may arise. Not

eco-friendly, must be disposed as dangerous waste.

NaCH3COO:

May cause skin, eye, and respiratory tract irritation. Readily environmentally friendly, must

always be disposed as hazardous spend.

Cost List:

1) NaCl

2) NaCH3COO

$12. 80

3) LiCl

$32. seventy five

Materials:

$3. 95

(2012 cost per 500g)

distilled drinking water

styrofoam cup

stir tavern and dish

thermometer

NaCl, NaCH3COO, LiCL (about 10 g each)

DATA STAND:

Calibration of

Calorimeter

Amount of

cold normal water

Volume of

warm water

Temp of cold

normal water

Temp of hot

normal water

Temp of

mixed normal water

Trial 1

100. 0 mL

75. 0 mL

21. 6˚C

50. 1˚C

35. 7˚C

Trial a couple of

100. 0 mL

75. 0 mL

21. 6˚C

49. 9˚C

35. 8˚C

Mass of Salt

First Temp

(temp of

water)

Final Temperature

(after you min)

Research

of Temp

change of 3

salts

NaCl

Trial #

Volume of

Normal water

40. zero mL

some. 01 g

22. 6˚C

21. 1˚C

2

NaCH3COO

1

45. 0 cubic centimeters

4. 05 g

19. 9˚C

18. 4˚C

you

40. zero mL

4. 03 g

20. 3˚C

16. 9˚C

Lab a few!

Julia (hour 2)

Research

of Temp

change of 3

salts

Trial #

Amount of

Water

Mass of Salt

Initial Temp

(temp of

water)

Last Temp

(after 1 min)

2

4. 00 g

19. 3˚C

16. 5˚C

1

45. 0 milliliters

4. 00 g

19. 5˚C

23. 1˚C

two

LiCl

forty. 0 milliliters

40. zero mL

5. 01 g

19. 1˚C

35. 0˚C

CALCULATIONS:

1a) q-cold

Trial 1: qcold

= ( m ) ( c ) (∆T)

= (200. 0 g)(4. 184 J/g˚C)(35. 7˚C - 21. 6˚C)

= 11800 J

Trial 2: qcold

= ( m ) ( c ) (∆T)

sama dengan (200. 0 g)(4. 184 J/g˚C)(35. 8˚C - 21 years old. 6˚C)

sama dengan 11900 L

Average: qcold = (11800 J) + (11900 J) = 11800 J

a couple of

This is an endothermic reaction. The amazing water is usually gaining strength from the hot water and the enthalpy change is usually positive.

1b) q-hot

Trial 1: qhot

= ( meters ) ( c ) (∆T)

= (200. zero g)(4. 184 J/g˚C)(35. 7˚C - 60. 1˚C)

sama dengan -12000 M

Trial a couple of: qhot

= ( m ) ( c ) (∆T)

=...

05.09.2019

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