2nd grade chemistry tutor

The second and third periods are known as short periods. Each consists of eight elements. The second period starts with lithium (Z = 3) and ends with inert gas neon (Z = 10). The third period starts with sodium (Z = 11) and ends with argon (Z = 18..

= 0.05608 = 0.0561 The number of significant figures in the term 3.24 is 3, therefore the result should have 3 significant figures. Therefore, the correct answer is 0.0561. The number after zero is 8 and therefore it is rounded off to one. = 0.2615 x 10 - 4 = 0.3 x 10 - 4 The answer should..

Main Features of Modern Periodic Table - 1. The modern periodic table is divided into two main categories: (i) Vertical columns called Groups and (ii) Horizontal columns called Periods. 2. There are 18 vertical columns or groups. These are further sub-divided into A and B (group..

The Reactivity Series of Metals - Element Symbol Group Number Potassium K 1 Sodium Na 1 Lithium Li 1 Calcium Ca 2 Magnesium Mg 2 Aluminium Al 3 Carbon C 4 (Non - Metal) Zinc Zn Transition Metal Iron Fe Transition Metal Tin Sn 4 Lead Pb 4 Hydrogen H Non - Metal Copper Cu Transiti..

Air as a Mixture - As we know that we cannot live without air even for a single minute. We live in a vast ocean of air, which extends upwards for over 1000 km. Apart from providing us air to breathe, this blanket of air traps the sun's heat that is essential for life on the earth, and also acts as ..

Importance of Chemistry - The branch of science, which deals with the study of matter, its composition, its properties and the changes that it undergoes in composition as well as in energy during various processes, is defined as chemistry. It has been further divided into differ..

Green Chemistry - Simply stated, Green chemistry is the use of chemistry for preventing environment pollution in order to protect human health. It may give the impression that it is branch of chemistry involving plants, which is not true. Green chemistry..

The branch of science, which deals with the study of matter, its composition, its properties and the changes that it undergoes in composition as well as in energy during various processes, is defined as chemistry. It has been further divided into different branches depending upon speciali..

Buffers find extensive use in analytical chemistry, viz., both in qualitative and quantitative analysis. For example, qualitative analysis of Group III and Group IV is done in solutions buffered by NH 4 Cl + NH 4 OH. Buffers are used in the removal of interfering radicals such as phospha..

Some Basic Concepts of Chemistry - A dynamic environment of matter and material surrounds man. Since his birth he has been exposed to these changing surroundings. His curiosity to understand his surroundings and the events occurring around him, has led him to systematically enquire and co..