Upgrade to remove ads
calorimetry: heat of reaction lab
Terms in this set (28)
the study of matter and the changes it undergoes
are physical or chemical changes involved in this experiment?
what are exothermic processes?
processes that release energy in the form of heat
what are endothermic processes?
those that absorb energy in the form of heat.
what is the heat of reaction? what does it depend on?
the heat transferred in any chemical reaction. it depends on the nature of the reactants and products
the amount of heat transferred depends on what?
the amount of material reacted
Is heat an intensive or extensive property?
when the amount of heat is expressed in J or kj/mole or gram, is it intensive or extensive?
in this experiment, what are you determining?
the molar heat of the reaction
what is the molar heat of the reaction?
the amount of heat involved per mole of reactant
what is the heat of a solution, of a substance in a solvent?
the amount of heat transferred when a given amount of substance is dissolved in a specified solvent.
What is the heat of neutralization?
the amount of heat involved in the reaction between a certain amount of acid and a base. this energy is expressed in joules
what is the molar heat of neutralization of an acid?
the quantity of heat involved per mole of acid neutralized
for a chemical reaction, what is the system? what is the surroundings? what about in a calorimeter?
the reactants are the system. the surroundings are the solvent, container, and everything else.
in a calorimeter, the surroundings is the calorimeter itself (the container, stirrer, and thermometer) and its contents (reaction mixture, and solvent)
a rise in temperature for this experiment indicates what type of reaction?
an exothermic reaction because the surroundings (the calorimeter) gain the heat
what is the equation of this experiment?
HCl (aq) + NaOH (aq) --> H2O (l) + NaCl (aq)
what are you determining in this experiment?
the molar heat or neutralization of hydrochloric acid with sodium hydroxide
is pressure constant in this experiment?
heat flow(q), is = to what?
the enthalpy change (delta H)
a positive sign for heat means what? what about a negative sign?
a positive sign means that heat is flowing into the system. a negative sign mean heat flows out of the system into the surroundings.
What is specific heat capacity?
the amount of heat energy needed to raise the temperature of one gram of any material by one degree
what is the special equipment?
double polystryrene coffee cups with lid, thermometer, hot plate, 100-mL graduated cylinder
What are the materials?
CO(NH2)2 (s) (urea),
HCl (aq) approx, 1.0M,
NaOH (aq) approx 1.1M
what is part A?
qualitative exploration of the heat of solution
part A steps
1. add approx 1 mL of DI water to a small test tube, then using a scoopula , add a large scoop (0.5 to 1 g) of solid CaCL2 to the tube.
2. CaCl2 is hygroscopic meaning that it absorbs water readily from the atmosphere. tightly close the lid to the tube immediately
3. record observations such as whether the tube is getting hotter or colder
4. using the same procedure , examine what happens when solid urea is added to a test tube of water
what happens in part B?
Determination of the molar heat of neutralization. you will measure the amount of heat transferred when aqueous solutions of HCl and NaOH are mixed, and calculate the molar heat of neutralization.
part B steps
1. obtain a calorimeter setup (double polystyrene foam cups with lid and thermometer) , and assemble the apparatus
2. record the exact molarities of NaOH and HCl solutions from the labels on the bottles.
3.Using a graduated cylinder, measure 50-55 mL of the NaOH solution into the calorimeter cup, and record the volume to the nearest 0.1 mL.
4. Replace the lid and thermal probe on the cup and allow the assembly to stand for a few minutes to reach constant temperature. Then, using a graduated . cylinder, measure . out 45-50 mL of the HCl and record its volume to the the nearest 0.1 mL.
5. record the temp of the NaOH solution in the calorimeter with the thermometer. rinse and dry the thermometer, then use it to record the temp of the acid solution in the .graduated cylinder to the nearest 0.1 C
6. quickly transfer all the acid into the NaOH solution in the calorimeter. immediately replace the lid and thermal probe, and swirl gently to mix the contents
7. observe the temp. if the temp is rising, not and record the maximum. if the temp is dropping, not and record the minimum.
YOU MIGHT ALSO LIKE...
Chemistry 1: Chapter 17 Thermochemistry…
Chapter 17: Thermochemistry
Pearson Chemistry Ch 17
chemistry Chapter 17
OTHER SETS BY THIS CREATOR
princeton biochem summary
fat and protein metabolism/ nucleic acid
enzymes and glycolysis
OTHER QUIZLET SETS
finance exam 1 review
HCR 261 HIPAA Quiz
FSCI100 CH 1,2,4,5
Religion II Unit 1 Test Questions Study Guide