| Category Archives: Chemistry Cafe |
| BENEFITS OF COOKING in case of Vitamin C |
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BENEFITS OF COOKING in case of Vitamin C
At this point, one may wonder why do we cook food if it is disadvantageous to us. There are some benefits that result from cooking: firstly, when you cook food, harmful micro organisms that are food- borne are destroyed. Additionally, the digestibility of many foods ( e.g. starch foods ) increases on cooking. Although this is not the most important benef
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| “Method to check the effect of cooking time on the Vitamin C content in cabbages?” |
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APPARATUS AND MATERIALS:
· 1 dm3 of a solution containing 5% orthophosphoric acid (H3PO4)
· 100 cm3 of aqueous 2, 6- dichlorophenolindophenol (dcpip) (0.4 gdm-3)
· 75 cm3 of ascorbic acid (0.20 gdm-3) in 5% orthophos
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| “What is the effect of cooking time on the Vitamin C content in cabbages?” |
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Vitamin C, which is also known as ascorbic acid, is a water-soluble vitamin needed by the human body. It has a chemical structure of carbon, hydrogen and oxygen. Pure ascorbic acid (vitamin C) appears white in color. However, when it is impure, its color changes into a slightly yellowish color. Moreover, when it dissolves in water, it turns the water mildly acidic. Many animals can manufacture vit
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| Vitamin C (ascorbic acid) |
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Vitamin C (ascorbic acid) is a substance that has been closely studied throughout history by many people. There have been many different experiments carried out to observe the effects of this substance. One such investigation was carried out in the department of Food Science and Microbiology, in the University of Milan by Serena Guarnieri, Patrizia Riso and Marisa Porrini.
Vitamin C seems to be
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| Chemistry sample CBSE Exam paper |
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| Test on Mole concept |
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Test on Mole concept
1.In industry calcium oxide is often used to remove water vapour from gas mixtures.
The water reacts to form calcium hydroxide.
The equation for the reaction of calcium oxide with water vapour is
CaO(s) + H2O(g) Ca(OH)2(s)
i) Calculate the relative formula masses of calcium oxide and water.
(Relative atomic masses: H = 1.0; O = 16; Ca = 40) &nb
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| Test on bonding and energetics |
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Test on bonding and energetics
1. (i) Define the terms lattice enthalpy and electron affinity.
(2)
(ii) Use the data in the following table and from the data booklet to construct the Born-Haber cycle for sodium chloride, NaCl, and determine the lattice enthalpy of NaCl(s).
Na(s) + Cl2(g) → Na
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| Assessment on Quantitative chemistry |
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Quantitative chemistry
1. How many molecules are present in a drop of ethanol, C2H5OH, of mass 2.3 × 10–3 g?
(L = 6.0 × 1023 mol–1)
A. 3.0 × 10 19
B. 3.0 × 1020
C. 6.0 × 1020
D. &
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| Characteristic properties of the solid state |
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Characteristic properties of the solid state are as following:
(i) They have fixed shape and size.
(ii) Intermolecular distances are short.
(iii) Intermolecular forces are strong.
(iv)Constituent particles (atoms, molecules or ions) have fixed positions and can only oscillate about their mean positions.
(v) They are incompressible and rigid.
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| Mole: A Simple Concept |
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Mole: A Simple Concept
MOLE- It is an amount of a substance in which 6.022X1023 particles are present.
6.022X1023 is known as Avogadro's number.
1 mole atoms = gram atomic mass = 6.022X1023 atoms
example - 1 mole oxygen atoms = gram atomic mass of oxygen =16 g = 6.022X1023 atoms
1 mole molecules = gram molecular mass = 6.0
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