What is Matter? • The Matter is everything!! • Classifying Matter According to Composition • Physical and Chemical Properties & Changes
What is Matter? â€˘ Matter is any substance that has both mass and volume. â€˘ Almost everything around us is matter including air and other gases. â€˘ Examples of things that are not considered matter are light, heat, other types of energy.
Properties Properties are the characteristics used to identify a substance.
Examples include, color, taste, smell, dimensions, density, etc.
Types of Properties 1. Chemical Properties
2. Physical Properties ďƒ˜ Quantitative vs. Qualitative Properties
Chemical & Physical Properties • Chemical Property – Describes the ability of a substance to form one or more different substances – The substance is combustible (will burn) – The substance will react with an acid • Physical Property – Describes a substance – Height, weight, colour, etc. – Includes qualitative and quantitative properties.
Qualitative vs Quantitative Properties • Qualitative properties are descriptive properties. – Example- The car is red.
• Quantitative properties are based on a number or measurement. – Example – It is 5°C outside.
Chemical vs Physical Change A chemical change results in a new substance being formed. A physical change results in the same substance with altered physical properties. Examples Chemical
Cleaning rust with steel wool
Chemical Change Clues 1. A gas is given off 2. A color change occurs. 3. A precipitate (solid) is formed. 4. Heat is absorbed or given off. 5. Electrons are transferred. Also, difficulty in reversing a change hints at a chemical change. Keep in mind these are only clues that a chemical change may have taken place. Proof still depends on a new substance being formed with new properties.
Published on Sep 14, 2011