Happy Monday!Please pick-up your name plate from the front table & put it on the corner of your desk. Have out your science composition notebook.

How does the precision of the

equipment affect the accuracy of

the measurement when calculating

density?

Density Equation

Density (D) = mass (m) volume (v)

Using the equipment at your lab table find the density (g/cm3 or g/mL) of:

- the block- the marble - water

While collecting data be thinking about:- the hypothesis- the procedure- the IV, DV, constants, etc.

Design an experiment that answers the

following question, and uses the data we

collected in today’s lab…

How does the precision of the equipment affect

the accuracy of the measurement when calculating density?

The PHYSICAL PROPERTIES of a substance are the characteristics of a substance that can be used to describe it.

There are two types of physical properties:

Extensive Properties

Extensive properties are directly related to the size/amount of a sample.

Intensive Properties

Intensive properties are NOT related to the size or amount of a sample.

There are 3 primary extensive properties that are related to the size of a sample.

Mass is related to the amount of matter in a substance. A larger sample has more matter, so mass is an extensive property.

Volume is the amount of space a sample occupies. A smaller sample would take up less space, so volume is an extensive property.

Length is simply how long a sample is. (Width and height are also just lengths.) Length measures the size of a sample, so it is also an extensive property.

28.1 grams of siliconApproximately 1 mole of Si

There are also three secondary extensive properties that are directly related to the mass of a sample.

The number of moles of a sample is also a measurement of the amount of matter. We will learn to convert between grams and moles a little later in the year.

The amount of energy in a sample is directly related to its size. The amount of potential and kinetic energy of an object is directly related to the size and mass of that object.

Gravitational Potential Energy

Kinetic Energy

The number of particles is also directly related to grams and moles of a sample. A larger sample has more mass which means more atoms, molecules or ions.

Silicon

Atom

Water

Molecules

Sodium Chloride

Ions

MVL MENRemembering this group of Super Heroes can help you remember

the extensive properties!

MVL MEN

assolumeengtholesnergyumber of particles

Captain Extreme

XXL

The Extender

Fighting crime one extensive property at a time!

Examples of INTENSIVE properties (not related to size):

Color State of Matter

Temperature/ Boiling Point/ Melting Point

Magnetism

What type of physical property is density?

Mass = 17.50 g

Volume = 13.0 cm3

Mass = 8.75 g

Volume = 6.50 cm3

Mass = 35.0 g

Volume = 26.0 cm3

Density =

1.35 g/cm3 Density =

1.35 g/cm3

Density =

1.35 g/cm3

Density is an INTENSIVE property

Because it is the relationship between mass and volume, it is independent of both. That makes density an intensive property.