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Showing posts with the label CHEMISTRY TERMINOLOGY

Humidity

What is Humidity?The simple meaning of humidity is ‘atmospheric moisture’ or ‘amount of water vapor in the atmosphere’.Humidity is the amount of water vapors present in the atmosphere (or air). Water vapors are the gaseous state of water and are invisible.Humidity can be measured by three ways that are: absolute, relative and specific.    1.Absolute humidity is the water content of air in the gram per cubic meter at a given temperature.     2.Relative humidity is expressed in percentage, and it measures the current absolute humidity relative to the maximum humidity for that temperature.    3.Specific humidity is expressed as the ratio of the mass of the water vapors to the total mass of moist air parcel.What is Absolute Humidity?To understand absolute humidity let’s assume you are standing in ground and you collect some air. Now you check that air volume in your chemistry lab and get accurate amount of water vapors in gram. If you collect 1 cubic meter of air volume and it contains 30…

Analytical Balance

Analytical BalanceWhat is an analytical balance? Analytical balance is a lab-instrument used to determine mass of any matter very precisely. These analytical balances are very sensitive and expensive lab-instruments, and also upon the accuracy and precision of analytical balance the accuracy of lab-analysis result depends so handle these balances very carefully. Generally used analytical balances are balances with the capacity of 100 gram to 200 gram and the sensitivity of 0.1 milligram to 0.001 milligram. For any quantitative chemical analysis there is need of analytical balance for the weighing of sample for analysis and weighing of reagents for solution preparation. Analytical balance pan used to put sample on it is enclosed in a glass-fitted case, means analytical balance sensitivity requires that it to be protected by the draft shield or enclosure.
Definition of Analytical BalanceAnalytical balance is a lab instrument with a scale to measure the mass to a high degree of precision.…

Chemical Reaction Quiz Part16

Chemical Reaction QuizScience Quizby www.ChemistryNotesInfo.comThis Chemical Reaction Quiz part16 is based on chemical reactions. 1. Chemical reaction always gives-Reactants
A change of state
A different substance
Water
All of the above
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2. From given below, 4-balanced chemical equations, which is example of combustion reaction-2Mg + O2 → 2MgO
2N2 + 3H2 → 2NH3
CaO + H2O → Ca(OH)2
2Na + Cl2 → 2NaCl
2CH4 + 4O2 → 2CO2 + 4H2O
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3. To balance a chemical equation, you should need to change-Chemical Formulas
Direction of the arrow
Coefficients
Subscripts
Superscripts
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4. In chemistry, if you try to balance a chemical equation by changing its subscripts, than you change the-Atomic number
Atomic Mass
Mass of the reactants
Number of molecules of product
Identity of the compound
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5. From given below, 4-balanced chemical equations, which is example of double displacement reaction-NH4Cl → NH3 + HCl
Cd(NO3)2 + Na2S → CdS + 2NaNO3
2Mg + O2 → 2MgO
2H2O2 → …

Amino Acids

Amino Acids Definition of Amino Acid Amino acid is a simple organic compound that contains a carboxyl (—COOH) and an amino (—NH2) group.
What are Amino Acids? Amino acids are organic compounds containing carboxyl (—COOH) and amino (—NH2) functional group with side chain, this side chain is specific to amino acid. Carbon, Hydrogen, Oxygen and Nitrogen are some important element which present in amino acids. Some other elements may also present in side chain of some amino acids.
Importance of Amino Acids As we all know that our body contains large amount of proteins also these proteins play important role in biological processes happening within human body. Amino acids are building blocks of these proteins means proteins contain amino acids.
Amino acids play key role in many body functions like cell structure, storage and transport of nutrients, proper functioning of organs, proper functioning of glands, proper functioning of arteries, proper functioning of tendons, healing of wounds, …

Density

DENSITYDensity of many samples is measured in labs for example in unites states oil and gas industry, they define density in general way as 'weight per unit volume' although 'weight per unit volume' is not density it is 'Specific Weight' so density is 'mass per unit volume'. Density is also known as "Volumetric Mass Density". Generally different materials have different density. Chemical element Osmium (Os having atomic number 76) is naturally occurring densest element. To simplify the comparison of densities of different materials or liquids it is needed to replace density with "relative density" as relative density is dimensionless quantity. Relative Density is also called "Specific Gravity". Specific gravity or relative density is the ratio of density of sample material to the density of standard material. Generally water is taken as standard material. If we take water as standard material than if we get relative density…

Branches of Chemistry



Chemistry is branch of Science, which is further divided into many branches like-

Chemistry GK