Chemistry- Unit one

Matter

Anything that has a mass and volume

Mass

The amount of matter in a object

Energy

Anything that can do work or produce heat

Weight

The force gravity acting on a objects mass

Solid

-has a fixed shape

-fixed volume

-not compressible

-high density

Liquids

-Does not have fixed shape

-fixed volume

-not compressible

-less dense than solid

Gases

-does not have fixed shape

-does not have fixed volume

-is compressible

-very low density

Matter can be separated into two areas called

Pure substances and Mixtures

What are two types of mixtures

Heterogeneous and homogeneous mixtures

Heterogeneous mixtures

Does not have a uniform composition and parts of the mixture can be physically seen

Homogeneous mixture

Has a uniform composition and parts of the mixture cannot be seen

Pure substances

Elements and compounds

What are elements

Found on a periodic table

Compounds

Formed when 2 or more elements are chemically combined. Ex:H₂O

Pure substances have a

Unique set of chemical and physical properties

Physical properties

Have be measured or observed without changing the indenting of the substance ex:color,texture

Chemical properties

Indicates how a substance reacts with another substance ex:flammable,combustible

Physical changes

Changes in appearance without changing the composition ex:melting,boiling,cutting

Chemical changes

How One or more substances react to form a new substance with different chemical and physical properties ex:rusting,burning

Law of conservation of mass

In any chemical or physical change, matter cannot be created or destroyed

Molecule

Two or more atoms held together by covalent bonds

Particle/temperature relationship

Particles will move faster as the object heats up more