Matter Mind over it

What is matter? Matter: anything that occupies space and has mass.

Are light and electricity considered matter? What about heat? Do they take up space? Do they have mass? Nope!

What are the 4 physical states of matter? Solid Liquid Gas Plasma

Solid anything that has a definite volume and a definite shape

Solids Maintain their shape and volume

Liquid anything that has a definite volume but no definite shape.

Liquids Maintain their volume Take the shape of their container

Gas Anything that has no definite volume and no definite shape.

Gases Take the shape and volume of their container

What is the fourth state of matter? Plasma!

What changes in physical state do fireworks go through?

When the atoms of matter are all the same, scientists call the matter an Element

A pure substance contains only one Element

Compound Two or more elements, chemically combined to form a new substance.

Table Salt is a compound

A word about “salt” In chemistry, “salt” means more than table salt. More on this in a few weeks.

Water is also a compound

Can the elements of a compound be separated by ordinary physical methods? No.

What is another form of combined substances? Mixtures

Examples of mixtures

What’s the difference? CompoundsMixtures Chemically combined Cannot be separated by physical means Have definite, set proportions Physically combined Can be separated by physical means Do not have definite, set proportions

What physical trait describes how close together the molecules or atoms of a substance are? Density

Volume is the amount of space an object takes up usually measured in liters (l) and milliliters (ml) for liquids Cubic centimeters (cm 3 ) for solids

Density D = m / v Density = mass  volume Density = grams per cubic centimeter

Rank the closeness of molecules in the three primary states of matter: Gas Liquid Solid

Sum it up! What is the relationship between the properties of the different states of matter and their densities?