Frank Modern Certificate Solution for Class 9 Chemistry Chapter 4 - The Language of Chemistry
Frank Textbook Solutions Chapter 4 - The Language of Chemistry
Frank Textbook Solutions are considered extremely helpful for solving difficult questions in the ICSE Class 9 Chemistry exam. TopperLearning Textbook Solutions are compiled by our subject experts. Herein, you can find all the answers to the questions of Chapter 4 - The Language of Chemistry for the Frank textbook.
Frank Textbook Solutions for class 9 are in accordance with the latest ICSE syllabus, and they are amended from time to time to be most relevant. Our free Frank Textbook Solutions for ICSE Class 9 Chemistry will give you deeper insight on the chapters and will help you to score more marks in the final examination. ICSE Class 9 students can refer to our solutions while doing their homework and while preparing for the exam.
Frank Modern Certificate Solution for Class 9 Chemistry Chapter 4 - The Language of Chemistry Page/Excercise 56
Symbol - It is the short form or abbreviation used for the name of an element. It represents one atom of that element.
Formula - Formula of a compound represents the composition of a molecule of the substance in terms of the symbols of the elements present in the molecule.
(c) Fe2 (SO4)3
(i) Mg (NO3)2
(j) Ca3 (PO4)2
(a) Valency - The combining capacity of an element is called its valency.
(b) Helium < Sodium < Magnesium < Carbon < Phosphorous
Law of conservation of matter governs a completely balanced equation. It states that "matter can neither be created nor destroyed."
A symbol signifies one atom of that element.
Latin names of the following compounds are-
Iron - Ferrum
Tin - Stannum
Lead - Plumbum
Sodium - Natrium
Potassium - Kalium
Mercury - Hydragyrum
The equation in which the total number of atoms of each element in the reactants, on the left side of the equation is same as the number of atoms in the products formed, on the right side of the equation is called as balanced chemical equation.
A chemical equation gives information about-
(i) What substances enter into a given reaction (reactants) and what products are formed as a result of the reaction.
(ii) The quantities of the reactants and the product formed.
(iii) The optimum conditions of temperature and pressure.
H2 means hydrogen, O4 means oxygen and S means sulphur in the formula of H2SO4.
(a) The highest valency of the element Z is six.
(b) The formula of the fluoride of Z will be ZF6.
The three valencies of element are-
(i) Two-Since the element X combines with two hydrogen to form H2X and two atoms of X combines with one carbon to form CX2.
(ii) Four-Since the element X combines with two oxygen to form XO2.
(iii) Six-Since the element X combines with three oxygen to form XO3.
Variable valency - Some elements are capable of showing more than one valency in their compounds called variable valency.
Some elements show variable valency i.e. more than one valency since these elements have more than one common valency state.
Chemical formula - It represents the composition of a molecule of the substance in terms of the symbols of the elements present in the molecule. The rule for writing the formula is criss-cross method.
(i) The positive and negative radicals are represented by their symbols and written side by side with the correct valency written below each.
(ii) The valencies are divided by their highest common factor if any to get the simplest ratio.
(iii) These numbers are then interchanged and written as subscripts.
(a) Sodium hydrogencarbonate
(b) Sodium hexacyanoferrate(III)
(c) Manganese(II) borate
(d) Calcium phosphate
(e) Potassium manganate(VI)
Co stands for cobalt which is an element while CO stands for carbon monoxide which is a compound.
A radical is an atom or a group of atoms of same or different elements that behaves in the manner of positive or negative ion. Radicals have their own combining power(valency) and chemical formulae.
Monovalent radicals -H-,OH-,Cl-,NO3-,H+,Na+,K+,NH4+
Trivalent radicals-PO43- ,Fe(CN)63-,AsO3 3-,N3-,Fe3+,Al3+,Bi3+,Au3+
(a) Anion - Negatively charged radicals are termed as anions.
(b) Cation - Positively charged radicals are termed as cations.
Disadvantages associated with hit and trial method of balancing of equations-
(i) It is tedious and takes a long time.
(ii) The method is rather difficult for balancing such equations which contain the same element being repeated in a number of compounds.
(iii) It does not give any information regarding the mechanism of the reaction.
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