Atoms, Molecules and Chemical Reactions

The topic describes the main five laws of chemical combination. It covers law of conservation of mass, definite proportions, multiple proportions, Gay Lussac's law of gaseous volumes and Avogadro's Law.

The topic discusses the Dalton's Atomic Theory. It mentions the propositions given by Dalton along with some drawbacks of this theory.

This topic discusses atoms and molecules in brief. It sheds light on the definitions of molecules, elements, atoms and compounds along with their examples. We will also learn some interesting facts related to the above terms.

The topic sheds light on the concept of elements. It discusses the reasons how elements like hydrogen and oxygen got their names. It also describes the symbols and representation of elements with their examples.

This topic explains the concept of atomicity with the help of examples. It includes a table to determine the atomicity of molecules of a few elements and asks us to write the symbols based on their atomicity. It also contains questions for practice.

This topic introduces us to the electrons present in the outermost shell of an atom. A tabular form is provided that enlist various elements and their valence electrons. Several examples related to the concept are also given here.

In this topic, we will learn about ions, the charged species present in metals and non-metal compounds. We will study positively and negatively charged species. Some ionic compounds and their constituent elements are also enlisted in a tabular form.

In this topic, we will understand the differences between atomic mass and molecular mass with the help of examples. It discusses the atomic mass of a few elements and also explains how to calculate the molecular mass of a substance.

In this topic, we will learn about the chemical formulae of a compound. It highlights the rules to be followed while writing and framing the chemical formulae. It also includes examples based on this concept.

In this topic, we will study the concept of formula unit mass. It explains why and in which situations it can be used to solve problems. It also describes how to calculate formula unit mass for a substance with the help of examples.

This topic discusses the concept of molar mass and explains how it is different from the molecular mass. It briefs on the mole concept with the help of a diagrammatic representation. It also consists of various related examples.

Through this topic, we will learn about the mole concept. It includes some problems based on the the same. We will also study some interesting facts related to this concept along with various examples.

In this topic, we will learn about chemical reactions and their different types. It includes activities based on the kinds of reactions. It also discusses chemical composition, displacement, decomposition, redox, and double displacement reactions.