Didactic Experiments Using Voltammetric Measurements

Author: João Carlos de Andrade; Audrey de Arruda Falcão; Elaine Castilho Guedes
April 2007

Abstract
Some analytical techniques, such as voltammetry, are relatively little used in undergraduate experimental disciplines in chemistry (and related sciences), although addressed in theoretical ones. Since, in contrast to what one thinks, voltammetric measurements are still often used in routine analysis, some of the most direct techniques will be highlighted in this text, with suggestions to [...]


Determination of the Molar Mass of a Metal

Author: Janaína César; João Carlos de Andrade
April 2006

Abstract
Besides conceptual and quantitative aspects, studies in chemistry should involve experiments with a demanding high level of care and attention in the use of experimental techniques. Considering these aspects, the determination of the molar mass of a metal, through the volume of gas released by its reaction with an acid, is an ideal experiment to [...]


The Use of a Graph of Residuals in the Modeling of Chemical Data

Author: Aline Renée Coscione; Audrey de Arruda Falcão; João Carlos de Andrade
April 2006

Abstract
The method of response surface analysis is employed to optimize the catalytic response of the Mo (VI) in the oxidation reaction of iodide ions by hydrogen peroxide, using the fixed time method. The absorbances of the non-catalytic reaction and the catalytic action of Mo (VI), the delta, were modeled. This was done in detail to [...]


Determination of Densities of Liquids and Solids

Author: Janaína Cesar; Marco-Aurélio De Paoli; João Carlos de Andrade
July 2004

Abstract
Many students think that density is simply the result of an arithmetic operation of division between mass and volume of a substance, but this concept is much broader and is related to others, such as compression and packing. For example, the greater the packing of atoms the more dense is the substance. Similarly, the greater [...]


Safety in a Chemistry Laboratory

Author: Aline Renée Coscione; Alex Magalhães de Almeida; João Carlos de Andrade; Rogério Custodio
March 2003

Abstract
In this text the basic safety procedures to be followed in a chemistry laboratory are indicated. They should be Incorporate into your daily work procedures.
Keywords
safety, laboratory chemicals, hazardous reactions, waste
Authors
Aline Renée Coscione
Alex Magalhães de Almeida
João Carlos de Andrade
Rogério Custodio
Universidade Estadual de Campinas, Instituto de Química
Translated by
João C. de Andrade
Revised by
Carol H. Collins


Safety Regulations of IQ/UNICAMP

April 2002

Abstract
The safety regulations of the Institute of Chemistry at Campinas State University determine the basic requirements for the protection of life and of locations where chemicals and equipments are used. These regulations apply to all persons located in the Institute of Chemistry and also to those who are not connected to it, but have authorized [...]


Simulation of a Breath Alcohol Analyzer

Author: João Carlos de Andrade; Aline Renée Coscione
May 2001

Abstract
The equipment known as the breath alcohol analyzer allows the determination of the amount of alcohol in the blood, ingested in the form of ethanol in alcoholic beverages, through the breath of a person. This determination is based on the principle that the alcohol contained in the blood is in equilibrium with the alcohol in [...]


Procedures for Handling Glass Ampoules

April 2001

Abstract
This text is intended to outline the basic procedures for the handling of substances in glass ampoules to be closed and / or opened in the glass workshop, and to establish the need for their compliance.
Keywords
glass ampoules, rules, chemistry laboratory, glassware, handling procedure


Directions for use of the Laboratory for Dangerous Reactions

April 2001

Abstract
All necessary precautions for the use of the Laboratory for Dangerous Reactions at the Institute of Chemistry (UNICAMP), as well as directions to be followed and the terms of liability which must be previously delivered to the Safety Committee are presented here.
Keywords
laboratory chemicals, chemical reagents, safety, waste, regulations
Translated by
João C. de Andrade
Revised by
Carol C. Collins


Iodometric Determinations

Author: João Carlos de Andrade
February 2001

Abstract
Volumetric methods using oxidation and reduction reactions depend on the potential of half-reactions involved but, beyond favorable potential conditions, the oxidizing and reducing agents must be stable in solution and the substance to be determined should have a stable oxidation state, defined before the titration is started. Iodometry is an indirect volumetric method, where an [...]






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