SOME BASIC CONCEPTS OF CHEMISTRY 3 A number of classical texts, like Atharvaveda (1000 BCE) mention some dyestuff, the material used wer e tur meric, madder,sunflower , orpiment, cochineal and lac. Some other substances having tinting property were ...

Chemistry is the study of matter and the changes it can undergo. In this first unit of class 11 chemistry, we learn the significance of scientific notation, rules to calculate significant figures, the laws governing the combination of different atoms, mole concept, stoichiometry that involves the study of amount of substances that are involved in reactions, and modes of expressing ...

Medical and Sanitation. The concept of chemistry is used in the manufacturing of drugs and medicines. For example, Cisplatin and Taxol are used in curing therapy. Along with it, AZT (Azidothymidine) is used to cure AIDS. It is also used in the manufacturing of disinfectants which are used in the killing of microorganisms.

2 Prefixes in SI system Multiple Prefix Symbol 10-12 pico p 10-9 nano n 10-6 micro µ 10-3 milli m 10-2 centi c 10-1 deci d 10 deca da 102 hecto h 103 kilo k 106 mega M 109 giga G 1012 tera T Mass and Weight-- Mass of a substance is the amount of matter present in it while ...

Class 11 Chemistry Chapter 1 focuses on providing you with basic concepts of Chemistry explained in an elementary manner which is lucid and easy to comprehend. The students’ grasping power increases as well because Class 11th Chemistry Chapter 1 Notes are detailed and in a simplified format to support better learning.

2019/6/25 · Some Basic Concepts of Chemistry Class 11 Notes Chapter 1. Chemistry has a direct impact on our life and has wide range of applications in different fields. These are given below: (ii) It has helped to protect the crops from insects and harmful bacteria, by the use ‘ of certain effective insecticides, fungicides and pesticides.

MCQ of Some Basic Concepts Of Chemistry. MCQs are the questions in which students of Class 9 can gain marks or can lose marks very easily. These questions are One marks questions with given multiple choices. They need to choose the correct option. These questions are very simple just based on the basic concepts.

Learn the concepts of Chemistry Some Basic Concepts of Chemistry with Videos and Stories. Are you one of those who loves Chemistry? That's great! But even if you are not, you must know some basic concepts of Chemistry. I'm sure after learning these, you might become a fan of Chemistry. Let's learn about what Chemistry actually is and it's basic concepts that will help you …

1.Assertion (A) : The empirical mass of ethene is half of its molecular mass. Reason (R) : The empirical formula represents the simplest whole-number. ratio of various atoms present in a compound. (i) Both A and R are true and R is the correct explanation of A. (ii) A is true but R is false. (iii) A is false but R is true.

2022/2/25 · If Avogadro number NA, is changed from 6.022 × 1023 mol –1 to 6.022 × 1020 mol–1, this would change (2015) (a) The mass of one mole of carbon. (b) The ratio of chemical species to each other in a balanced equation. (c) The ratio of elements to each other in a compound. (d) The definition of mass in units of grams.