230 likes | 391 Views
Properties of Matter. How do we tell different types of matter apart?. Salt or Sugar?. What is a property?. A distinctive attribute or quality of something An observation. Two Types of Properties. There are two types of properties: Physical Properties Chemical Properties.
E N D
What is a property? • A distinctive attribute or quality of something • An observation
Two Types of Properties • There are two types of properties: • Physical Properties • Chemical Properties
Physical Properties • Physical properties are properties that you can observe without changing the identity of the material. • For example: A rubber band is stretchy. If you stretch a rubber band, it is still a rubber band.
Physical Properties • Physical properties are descriptive. • They include the appearance and behavior. • The appearance of the item is how it looks, feels, tastes, as well as any measurable characteristics like mass, volume, etc. • The behavior of an item is going to be how it reacts with certain other things. For instance, metals are usually attracted by magnets.
Physical Properties • What are some physical properties of this honey? Yellow-ish Sticky sweet
Common Physical Properties • Magnetic • Dense • Color • Size • Shape
Physical Change • A change in the size, shape, or phase of matter is known as a physical change. • A physical change is one in which the basic identity of the objectdoes not change! • Another way to look at it is that a physical change is one which you can change back.
Common Physical Changes • Physical changes change the appearance of a substance, but the chemical makeup does not change. • Examples of Physical Changes include: • Size • Shape • Phase (solid, liquid, gas) • Dissolving
Chemical Properties • A characteristic that indicates it can undergo an chemical change.
Common Chemical Properties • Flammability • Reactivity • Rust (Oxidation)
Chemical Properties • What is a chemical property of this railroad spike?
Chemical Change • The changing of one substance into another. • New substances are produced because of the breaking of chemical bonds. • ONE WHICH YOU CAN’T CHANGE BACK
Detecting Chemical Change • A new substance is ALWAYS produced in a chemical change.
New substances are produced by the making and/or breaking of bonds. Chemical Changes
Indicators • There are five indicators that help us to know that a chemical change is taking place: • Unexpected Color Change • Energy Transfer • Precipitate Produced • Odor Produced • Gas Produced
2. Energy Transfer • Endothermic (gets cold) • Exothermic (gets hot) • Sound produced • Light produced
3. Precipitate Produced • Two liquids produce a solid • The solution sometimes looks cloudy or milky. • Solid falls to the bottom of the solution.