CHEM 101L Chapter Notes - Chapter 6.4: Heat Capacity

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ceruleantortoise232

5 Nov 2016

School

CSUN

Department

Chemistry and Biochemistry

Course

CHEM 101L

Professor

Dr.Nguyen- Graff

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Document Summary

Chem 101: defining specific heat capacity and the unique properties of. First off let us define what specific heat capacity is. The specific heat capacity in physical terms is the amount of energy required in order to heat up 1 gram of substance by 1 c. The specific heat capacity is a specific constant for the respective element/compound/substance we are referring to. Each state of a substance also has its own unique specific heat capacity. As can be seen in the statement above, the units for specific heat capacity is j/g c. As also stated above the base standard for specific heat capacity is 4. 184 j/g c. Initially the definition of specific heat capacity is 1 cal/g c. Units for energy can be calories or joules. Joules is the si unit for energy so we define 1 calorie as. Also calories does appear on nutrition facts, but nutrition facts have capital calories, really meaning they are kcal.

Related Questions

Part 1: Separation of Iron filings

Mass a watchglass and record
Obtain a Kimwipe tissue from the top of the benches and a rodmagnet
Wrap the Kimwipe tissue around the magnetic end, holding thetissue tight to the rod magnet.
Swirl the Kimwipe in your mixture. Knock off excess sand beforemoving on to step 5
Carefully over the watch glass remove the Kimwipe tissue fromthe magnet so the iron falls on the the watch glass
Repeat steps 4 and 5 two more times, make sure you record howsuccessful this separation was ï¿½ does the evaporating dish containonly iron?
Mass the watchglass and the collected iron.
Dispose of the iron in the hood.

Part 2: Separation of N

Mass a clean, dry, evaporating dish.
Pour the leftover mixture from step 1 into the evaporating dishand mass.
Place the evaporating dish on a hot plate in the hood.
Gently and slowly heat the mixture until the white fumes cease.Be patient. Depending on the amount of ammonium chloride in yoursample, this could take quite a while. A half our would not beunheard of.
Stir the mixture frequently to facilitate the sublimation ofthe ammonium chloride. This is crucial in order to obtain goodresults. (Use crucible tongs to hold onto the dish so it doesnï¿½tmove as much)
After the white fumes disappear, turn off the hot plate andremove the evaporating dish with crucible tongs and let it cool inthe hood.
When the evaporating dish is cooled, mass the left overmaterial and the evaporating dish.

Part 3: Determining the amount of NaCl.

Measure 10 mL of distilled water in a graduated cylinder.Slowly add the water to the mixture in the evaporating dish whilecontinuously stirring with a clean, glass stirring rod. Afteradding all of the water, stir for 2 min more.
Assemble the gravity filtration apparatus shown in Figure1.
Fold a piece of filter paper as shown in Figure 2. Open up thepaper cone, and place it in the filtering funnel.

Position a beaker under the funnel, making sure that the funnelstem is touching the inside wall of the beaker. Pour as much of thesupernatant liquid as possible from the evaporating dish intofunnel. Collect the filtrate in the beaker.
Transfer the solid remaining in the evaporating dish into thefunnel, using a stream of distilled water from a wash bottle, asshown in Figure 3.
Re mass the watchglass from Part 1 and record this mass.
Pour the filtrate in the beaker into the evaporating dish
Place the evaporating dish containing the filtrate on a hotplate. Begin heating the solution.
While the solution is heating to boiling, move onto Part 4

Carefully remove the filter paper and residue from the funnel.Place the paper and residue onto the watchglass.
Place the watchglass with the filter paper and sand on top ofthe boiling salt solution to dry the sand
Keep the salt water boiling, until there is just a little bitof water left, or popping sounds are heard, then turn off the hotplate, and allow the heat from the hot plate to finish evaporatingand drying your salt.
Allow the evaporating dish and its contents to cool to roomtemperature.
Obtain another watch glass and mass.
Transfer the dried sand and filter paper from original watchglass (caution, salt has spattered onto this watch glass, so donï¿½tknock any off, that is product you will need) onto the new cleanmassed watch glass. Replace the original watch glass onto thecooling evaporation dish
Mass the new watch glass, sand and filter paper all together.Discard filter paper and sand into garbage. Observe how pure yoursand looks.
After evaporating dish has cooled, determine the mass of theevaporating dish, watch glass plus NaCl. Record this mass. Then,discard the NaCl as directed. Wash evaporating dish and watch glassto dissolve the salt.
Observe how pure your salt looks.

Result and Discussion: Separation Lab

Substance	Grams recovered	% mass
Fe
NH4Cl
NaCl
SIO2

Overall percentRecovery:

A) Explain what steps(s) youcould have improved (and how) to help your percentrecovery.

b) Write a paragraph about thelab include briefly what was done, your result, were you correctand possible experimental errors- do not state human measurementerrors as errors. Be Specific, what specific human errors occurred,what measurement errors occurred, what process in the experimentcould errors have occurred.

CHEM 101L Chapter Notes - Chapter 6.4: Heat Capacity

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