Chemistry

Punjab Chemistry Online 9th Class Test Lesson 8 Chemical Reactivity

Reactivity in chemistry refers to the chemical reactions of a single substance, the chemical reactions of two or more substances that interact with each other, the systematic study of sets of reactions of these two kinds, methodology that applies to the study of reactivity of chemicals is called the Chemical Reactivity. Chemical Reactivity Lesson 8 Chemistry Online Test 9th Below

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Punjab Chemistry Online 9th Class Test Lesson 7 Electrochemistry

The branch of chemistry that deals with the relations between electrical and chemical phenomena. Electrochemistry is a branch of chemistry dealing with chemical reactions that involve electrical currents and potentials. studies chemical reactions which take place in a solution at the interface of an electron conductor Electrochemistry Lesson 7 Chemistry Online Test 9th Below

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Punjab Chemistry Online 9th Class Test Lesson 6 Solutions

In chemistry, a solution is a homogeneous mixture composed of only one phase. In such a mixture, a solute is a substance dissolved in another substance, known as a solvent. The solvent does the dissolving. The solution more or less takes on the characteristics of the solvent including its phase, and the solvent is commonly the major fraction of the …

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Punjab Chemistry Online 9th Class Test Lesson 5 Physical States of Matter

States of matter in physics are the distinct forms that different phases of matter take on. Four states of matter are observable in everyday life: solid, liquid, gas, and plasma. Diffusion is defined as spontaneous mixing up of molecules by random motion and collisions to form a homogeneous mixture. Historically, the distinction is made based on qualitative differences in properties …

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Punjab Chemistry Online 9th Class Test Lesson 4 Structure of Molecules

A group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction. The definition of the molecule has evolved as knowledge of the structure of molecules has increased. Earlier definitions were less precise, defining molecules. The three dimensional shape or configuration of a molecule is an important characteristic. Structure …

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Punjab Chemistry Online 9th Class Test Lesson 2 Structure of Atom

According to Dalton that An Atom is and invisible, hard dense sphere, Atoms of the same element are alike, Atoms combine in different ways to form a compound. In 1932 James chadwick discovered a neutron. When he bombarded alpha particles on a beryllium target He observed that highly penetrating radiations were produced. Structure of Atom Lesson 2 Chemistry Online Test 9th …

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Punjab Chemistry Online 9th Class Test Lesson 1 Fundamentals of Chemistry

The Branch of Science which is concerned with the substances of which matter is composed the investigation of their properties and reactions, and the use of such reactions to form new substances. The properties such as structure of atoms or formation of molecules behavior of gasses, Liquids and solids. Fundamentals of Chemistry Lesson 1 Online Test 9th Below

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