Category: 1. introduction of Chemistry

Chemists measure the properties of matter and express these measurements as quantities. A quantity is the amount of something and consists of a number and a unit. The number tells us how many (or how much), and the unit tells us what the unit of measurement is. For example, when a distance is stated as…

Chemists study the structure, physical properties, and chemical properties of materials. They consist of matter, which is anything that occupies space and has volume. Gold and iridium are substances, like peanuts, people and stamps. Smoke, smog and laughing gas are substances. Energy, light, and sound, however, are not substances; Thoughts and feelings also do not…

Water can take many forms. At low temperatures (below 0oC), it is a solid. When at “normal” temperatures (between 0oCand 100oC), it is a liquid. While at temperatures above 100oC, water is a gas (steam). The state that water is in depends on the temperature. Each state (solid, liquid, and gas) has its own unique…

Chemistry is the branch of science that deals with the properties, structure, and composition of elements and compounds, how they can change, and the energy released or absorbed when they change. The Scope of Chemistry Chemistry is the study of matter and the ways in which different forms of matter combine with each other. You…