What is Matter? What are the 4 Physical States of Matter? Anything that has mass and takes up space Solids: Definite shape and volume Close packing of.

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Presentation transcript:

What is Matter? What are the 4 Physical States of Matter? Anything that has mass and takes up space Solids: Definite shape and volume Close packing of molecules Strong molecular forces Liquids: Definite volume but not definite shape (assumes shape of container) Slightly weaker molecular forces than solids (this is what allows liquids to flow) Gas: No definite shape or volume Very weak molecular forces (which allows gasses to be greatly compressed) Plasma: No definite shape or volume

Mystery Bag Activity Observations: Think about it: What do you notice that is similar about the observations listed above?

What are Properties? Characteristics and behaviors we use to describe matter There are 2 types of properties: Physical Chemical What are Physical Properties: Can be observed or measured without changing the identity of the matter Properties you notice when using one of your five senses or measurement tools Feel – mass, volume, texture, malleability Sight – color, luster, mass, volume, density Hear Smell Taste

What are Chemical Properties? A substances ability to combine with or change into a new substance Common chemical properties: Reactivity – how likely a substance it to react with another substance to create something new Reactive to oxygen Reactive to air Reactive to water Flamability – how likely a substance is to catch fire If it CHanges, it’s CHemical

Physical: properties of a pure substance, we can see without changing it into a new substance. Examples include: Chemical: properties of a pure substance that describe its ability to combine with or change into a new substance. Examples: 1. physical state: solid, liquid, gas 2. color 3. shape 4. mass 5. texture 6. melting (0 0 C) & boiling point (100 0 C) 7. density 8. solubility in water – the ability to dissolve in water 9. odor 10. luster – shine 11. malleability – ability to be hammered into thin sheets 1. Flammability 2. Reactivity to water 3. Reactivity to air 4. Reactivity to oxygen ***Notice that Chemical Properties are not as easy to notice as Physical Properties. Physical & Chemical Properties 2 Properties can be broken down into two types - physical and chemical properties. What’s the difference?

What is a Physical Change? Changes to a substance that can be observed without changing its identity Examples: Size Shape Change of state – Easily reversed Ex – water freezes into ice, boils into water vapor – but it’s still water Dissolving a substance into another substance – Ex – salt dissolves in water – but they are not chemically combined – they can be separated (Distillation)

What is a Chemical Change? Changes to a substance that results in an entirely new substance forming Chemical changes are often much more obvious than physical changes Examples: Color change Light, heat or energy released (burning) Gasses or solids form where there were none before

Examples of Chemical Changes: Iron rusting Wood burning Baking a cake Spoiled Milk Milk needs to be in the refrigerator or else it will go bad If you’ve ever seen or smelled spoiled milk, it is not a pretty sight The milk gets a sour odor and becomes lumpy Unlike physical changes, you cannot reverse chemical changes You can melt ice to get water and freeze that water to get ice again You cannot make milk unspoiled

Chemical Changes 23