Chemistry Chemical/Physical Properties & Changes If H 2 O is the formula for water, what is the formula for ice? H 2 O cubed.

What is Matter? Think and Discuss

What is Matter? Matter is any substance that has both mass and volume. Almost everything around us is matter including air and other gases. 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  Quantitative vs. Qualitative Properties

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

Types of 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.

Types of Properties Please turn to the Physical and Chemical Properties Handout

Chemical vs Physical Change A chemical change results in new substance being formed. A physical change results in the same substance with altered physical properties. Examples Chemical Physical_____ Burning wood Sawing wood Decomposing waterFreezing water Nail rustingCleaning 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.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.

Is it a Physical or Chemical Change? The following video will help explain the differences between Physical and Chemical Changes.