unit 3: chemistry. elements, compounds, mixtures
TRANSCRIPT
Every atom in every bar is gold and nothing else.
Unit 3: Chemistry. Elements, Compounds, Mixtures.Element: A pure substance with only one type of particle.
The amount you have does not matter.
Unit 3: Chemistry. Elements, Compounds, Mixtures.
How do I know if something is an element?
Chemical PropertiesReactivity with acids
Physical PropertiesBoiling pointMelting point
DensityLuster
MalleabilityDuctility
These are separated by metals, metalloids, and nonmetals.
In order to be chemically combined, a reaction has to occur.
Unit 3: Chemistry. Elements, Compounds, Mixtures.Compounds: A pure substance with two or more particles.
The particles must be chemically combined.
Compounds can be separated into their elements ONLY through chemical change.
Unit 3: Chemistry. Elements, Compounds, Mixtures.
How do I know if something is a compound?
Chemical PropertiesReactivity with acids or
light
Physical PropertiesBoiling pointMelting point
DensityLuster
MalleabilityDuctility
Compounds have their own individual properties.
They are usually different than the elements that make them up.
If no reaction occurred, it is a mixture.
Unit 3: Chemistry. Elements, Compounds, Mixtures.Mixtures: Combination of two or more substances that are
NOT chemically combined.
Mixtures can be separated into their original substances through physical change.
Unit 3: Chemistry. Elements, Compounds, Mixtures.
How do I know if something is a mixture?
Physical & Chemical PropertiesThe individual substances that make up a mixture retain
their original properties.
Unit 3: Chemistry. Elements, Compounds, Mixtures.
Mixtures vs. Compounds
Mixtures Compounds
Components are elements, compounds, or both
Components are elements
Components keep their original properties
Components lose their original properties
Separated by physical means
Separated by chemical means
Formed using any ratio of components
Example: Cookie dough can have a 5g or 50g of chocolate chips.
Formed using a set ratio of components
Example: H2O must have two hydrogen atoms and one oxygen atom.