Simplified Chemistry

The law of Conservation of Mass states that the mass of matter before and after a chemical change remains the same. The number of atoms also remains the same. The only thing that changes is the arrangement of the atoms. For example, the mass of hydrogen and oxygen before they combine to make water is the same as the mass …

Like matter, energy can be classified in different ways. For example, energy can either be kinetic or potential. Kinetic energy is energy of motion. Gases are made of molecules that have more kinetic energy than molecules in the solid phase of that substance. For example, water molecules in steam have greater kinetic energy than molecules in liquid water. Potential energy …

Substances can undergo three type of changes: – Physical changes – Chemical changes (also known as chemical reactions) – Nuclear changes (also known as nuclear reactions) In a physical change the appearance (color, shape, etc.) of the substance may change, but the substance will remain the same substance. A phase change is an example of a physical change. For example, …

Matter is characterized by its properties. There are two kinds of properties: Chemical properties describe the abilities of a substance to undergo chemical reactions and to form new substances. Physical properties are qualities such as color, smell, taste, hardness, density, boiling and melting point, the conduction of electricity, and the ability to dissolve other materials.The physical states of matter, sometimes …

  Nature and Scope of Chemistry Chemistry: is the study of matter and the changes that matter undergoes. Matter is made up of almost infinitesimally small building blocks called atoms. Atoms can combine together to form molecules. Molecules of a few familiar substances are represented here. In later chapters you will learn more about how atoms combine to form molecules, and how molecules have the …