The document discusses calorimetry and specific heat. [1] Calorimetry is used to measure heat changes in chemical and physical processes using a calorimeter, which is an insulated device that measures heat absorption or release. [2] Specific heat is the amount of heat needed to change the temperature of 1 gram of a substance by 1 degree Celsius or Kelvin and is measured in Joules per gram-degree. [3] An example calculation is shown to determine the specific heat of copper using calorimetry data.
Aldehydes and ketones are the carbonyl compounds with general formula CnH2nO. Aldehydes have at least one hydrogen atom bonded to the carbonyl group and other group is either hydrogen or an alkyl or aryl group (i.e. Aldehyde has one alkyl or aryl group and one of the hydrogen bonded to the carbonyl carbon) with characteristics functional group -CHO.
Aldehydes and ketones are the carbonyl compounds with general formula CnH2nO. Aldehydes have at least one hydrogen atom bonded to the carbonyl group and other group is either hydrogen or an alkyl or aryl group (i.e. Aldehyde has one alkyl or aryl group and one of the hydrogen bonded to the carbonyl carbon) with characteristics functional group -CHO.
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Section: Distillation
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Slides for the eLearning course Separation and purification processes in biorefineries (https://open-learn.xamk.fi) in IMPRESS project.
Section: Distillation
Subject: 1.1 Vapor Liquid Equilibrium
This presentation is on shell and tube heat exchanger in which its design parameters and its troubleshooting conditions designed for better understanding and learning of all
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Both clomiphene and tamoxifen are selective estrogen receptor modifiers (SERMs); inhibiting estrogen receptor at the level of the pituitary, both FSH and LH levels increase. As a result, testosterone increases, thus favoring sperm growth and maturation .
In hypogonadism and oligospermia, clomiphene is used as monotherapy . Starting dose is 25 mg o.d.; as clomiphene is normally available in 50 mg tablets, a starting dose could be 50 mg every other day. When testosterone remains low, clomiphene can be titrated up to 100 mg o.d.
Clomiphene has also been used on hypogonadic patient with azoospermia. Increases in testosterone in the testis may favor production of sufficient sperm in the ejaculate. Tamoxifen is used for the same indications , at a dosage of 10-20 mg o.d.
Chua ME, Escusa KG, Luna S, Tapia LC, Dofitas B, Morales M (2013) Revisiting oestrogen antagonists (clomiphene or tamoxifen) as medical empiric therapy for idiopathic male infertility: a meta-analysis. Andrology;1:749-57Roth LW, Ryan AR, Meacham RB (2013) Clomiphene citrate in the management of male infertility. Semin Reprod Med 31:245-50Moein MR, Tabibnejad N, Ghasemzadeh J (2012) Beneficial effect of tamoxifen on sperm recovery in infertile men with nonobstructive azoospermia. Andrologia;44 Suppl 1:194-8.
Piubello GD Endocrine Infertility in Clinical Management of Male Infertility. Springer editor 2015.
Cavallini G, Beretta G, Biagiotti G Preliminary study of letrozole use for improving spermatogenesis in non-obstructive azoospermia patients with normal serum FSH Asian Journal of Andrology (2011), 1–3
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The chemical energy of a system is changed as a result of a reaction. Calorimetry. Heat of combustion . Calculation of caloric content of sucrose or food. Combustion reaction.
Topic Contains:
What is Thermo Chemistry ?
Define Origin of Heat of Reaction..
Exothermic Reaction..
Endothermic Reaction..
Graphical representation of Exothermic
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Different type of heat reactions..
Hess’s law..
1. Title: SPECIFIC HEAT AND CALORIMETRY
BACKGROUND:
Calorimetry
Method used to measure heat
The accurate and precise measurement of heat change for chemical and physical
processes.
Calorimeter
An insulated device used to measure the absorption or release of heat in a chemical
or physical change. Usually water is the chemical that captures heat.
Heat of combustion
Combustion reactions are reactions of hydrocarbons (CHO) with oxygen.
Types of chemical reactions:
1. Exothermic reactions
In exothermic reactions the heat is released by the system (example: spark, flame
or explosion). Combustion reactions are always exothermic.
2. Endothermic reactions
Is a type of reaction in which the system absorbs heat from the surroundings,
causing its surroundings to loose heat or “cool down”.
2. Specific heat, SH (J/g-oC) or (J/g-K)
Heat needed to raise 1 g of substance 1oC.
Capacity to gain (or lose) heat
Also called heat capacity and specific heat capacity.
Specific heat of water: 4.187 J/g-oC
Heat or Energy (Q)
Measured in Joules (J) or Calories (cal)
A calorie is the amount of energy (heat) needed to raise the temperature of 1 g of
water 1oC.
Example:
Determine the specific heat of 259 grams of copper at initial temperature of 22.3 deg C placed in
374 grams of water with initial temperature of 92.7 deg C. The final temperature after putting the
copper in the water is 88.5 deg C.
Solution:
= - 6,576.9396 J
Substituting;
C = 0.3836 J/g-K
Reference:
Washington State Community College