Chemical and Physical Properties

Chemical and Physical Properties

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Physical Properties of an Element

Physical Property: Characteristics that can be observed or measured without changing the composition (identity) of a substance

Observing that an apple is red or that you are able to hold it in your hand will not change what the apple is made of!

Open Ended

List 3 physical properties of a this can of Sprite.

Physical Properties of Matter - Examples

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Density is a property that describes the relationship between the mass of a material and its volume. It does not change the substance.

Substances that have a higher density contain more matter (stuff) in a given volume.

The density of a substance will stay constant/the same.

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Physical Property-Density

Multiple Select

Density is a physical property that describes the relationship between the ________ of its _________.

• matter, volume

• mass, volume

• volume, matter

• none of the above

Physical Property-Melting Point

• The temperature at which a solid can change to a liquid.
  

• The temperature at which a pure substance melts is unchanging under constant conditions.

  
  

Multiple Choice

The physical property melting point is the

• temperature at which a liquid changes to a solid

• temperature at which a liquid boils

• temperature at which a solid can change to a liquid

Physical Property-Boiling Point

• The temperature at which liquid boils.

• A substance can change from a liquid to a gas in this process.

• The boiling point is unchanging under constant conditions for a given substance.

  
  

Poll

Choose all the answers below that are true about boiling points.

• at the point a liquid boils

• changes from a liquid to a gas

• boiling temperature is unchanging

Physical Properties- Color

• Can be used to identify substances along with other properties.

• The absence of color is also a physical property.

Physical Properties of Metals

• Good conductor of heat and electricity.

• Conductivity- does it heat up or allow electricity to pass through it.

• Is it ductile- can it be stretched out into a wire.

• Can it be hammered into sheets or pounded into shapes- Malleable.

• Do they have luster- are they Shiny?

• They are solid at room temperature. Except for Mercury (Hg).

Multiple Choice

Metals are

• good conductors of heat only

• good conductors of heat and electricity

• conductors of electricity

Multiple Choice

The tranisition metal copper has luster. This means

• is is very dull

• it is very shiny

• it is very thin

• it is very dirty

Open Ended

Explain what it means when we say some metals are malleable and ductile.

Chemical Properties

Can ONLY be observed by changing the identity of the substance. A material's properties that becomes evident during a chemical reaction

Wood can be burned to produce ash and smoke.  Both with different properties than the original

Chemical Properties

• Flammability- the ability of a chemical to burn or ignite.

• Combustibility-how easily a substance can burst into flames, through fire or combustion.

• Reactivity - when a substance undergoes a chemical reaction (Ex: Rust)

Open Ended

Explain reactivity.

Multiple Choice

Which chemical property has the ability to burn or ignite?

• combustibility

• flammability

• toxicity

• pH