♪⚝Sanjiv❀Jaiswal❁⩸ • 196 Reads
General Introduction of Chemistry↪ Chemistry is a branch of science which deals with the properties, composition and transformation of matter.↪ It is a science where chemists put their views on systematic organization and explanation of facts observed by experiments to all kinds of matter.↪ Chemistry begins with the knowledge...
♪⚝Sanjiv❀Jaiswal❁⩸ • 174 Reads
⁕ Scope of Chemistry↪ It is determined by the extent up to which properties, structures and application of different matters are investigated for learning.↪ New thoughts are sought day by day and the field of learning chemistry is expanded.↪ Being the scope vast and diverse, chemistry is studied by classifying it into differ...
♪⚝Sanjiv❀Jaiswal❁⩸ • 155 Reads
⁕ Element↪ Simple forms of matter which can't be decomposed into simpler substance by any chemical methods are called elements.Eg: hydrogen, nitrogen, iron, etc.⁕ Atom↪ The smallest particle of an element which can take part in chemical reaction can't be broken into smaller unit is called an atom.⁕ Compound↪ A compound is a ...
♪⚝Sanjiv❀Jaiswal❁⩸ • 175 Reads
⁕ Molecular Formula↪ Symbolic expression for a substance is called a formula.↪ When the molecule of a substance is written with the help of symbols, we get what its called molecular formula.↪ A molecular formula is the shorthand expression of the composition of a molecule. ↪ It tells about the number and kinds of atoms whic...
♪⚝Sanjiv❀Jaiswal❁⩸ • 253 Reads
↪ A chemical change is a process that involves formation of one or more than one new substance having properties entirely different from the original substance.↪ Substance that reacts is called the reactant and that forms after chemical reaction is called product.The following are the general characters of a chemical change:↪...
♪⚝Sanjiv❀Jaiswal❁⩸ • 190 Reads
↪ When a chemical change occurs, a chemical reaction is said to have taken place.↪ In other words, a chemical reaction causes chemical change in the reaction.↪ Thus, we can say that both chemical change and reaction imply the same action.⁕ Types of Chemical Reaction↪ There are many types of chemical reactions. All the availa...
Atomic no. (Z) = 13 and atomic mass (A) = 27
No. of neutrons = A-Z = 27 - 13 = 14
No. of electrons = 13 - 3 = 10
Al atom loses 3e- to form Al+3.
The permanent change in which one compound is transformed into other compound have different properties is known as chemical change.
Two important characters are:
a. It is irreversible change.
b. New compound having different properties are formed.
Atomic no. (Z) = 19 and Atomic mass (A) = 39
No. of neutrons = (A - Z) = (39 - 19) = 20
No. of electrons = Number of protons = Atomic number
Which of the elements listed below was called in honor of a country?
Which is the example of hydrolysis reaction?
What is the symbol for tungsten?
The name of the chemical compound N2O is
Potassium manganate has the formula
Which statement is erroneous?
Which of the elements given below was called in honor of a continent?
According to the current definition, 1amu corresponds to
Approximate atomic weight of an element is 26.89. If its equivalent weight is 8.9, the exact atomic weight of element would be
The number of moles present in 6 gm of carbon is:
What is the concentration of nitrate ions if equal volumes of 0.1 M AgNO3 and 0.1 M NaCl are mixed together
The -ve charged particles is called:
What is the normality of a 1 M solution of H3PO4
The total number of ions present in 111 g of CaCl2 is
Which of the following weighs the most?
Under similar conditions of pressure and temperature, 40 ml of slightly moist hydrogen chloride gas is mixed with 20 ml of ammonia gas, the final volume of gas at the same temperature and pressure will be
An organic compound contains carbon , hydrogen and oxygen. Its elemental analysis gave C, 38.71% and H, 9.67%. The empirical formula of the compound would be
Which of the following cannot give iodometric titrations
What is the concentration of nitrate ions if equal volumes of 0.1 MAgNO3 and 0.1 M NaCl are mixed together
The number of moles present in 6 gms of carbon is:
Which of the following contains same number of carbon atoms as are in 6.0 g of carbon (C – 12)?
A symbol not only represents the name of the element but also represents
Atomic weight of an element is not necessarily whole number because