Organizing Data

A graph is a pictorial representation of

information recorded in a data table. It is used to show a relationship between two or more

factors.

Types of Graphs• Line graphs are best for displaying data that changes. It

best shows the relationship between two variables. • A variable is anything that can change in an experiment. • Line graphs are made with the x-axis showing the

independent variable (manipulated variable) and the y-axis showing the dependent variable (responding variable).

DRY MIX

Types of Graphs (2)

• Bar graphs are best for comparing data for several individual items or events. Bar graphs use a series of columns to display data.

Types of Graphs (3)

• Pie charts are best for displaying data that are parts of a whole.

Collecting Data & Creating a GraphType of Shoe # of Students in Class Wearing Shoe

Tennis Shoes 7

Boat/Dock Shoes 5

Flats 4

Sandals 2

Tennis Shoes

Boat Shoes

Flats Sandals012345678

Type of Shoes Worn in 1st Period Chemistry

# of Students

Now, it’s your turn!Step 1: Decide on a particular set of data you want to collect from the

class. Examples: eye color, shoe size, favorite ice cream

Step 2: Create a table.

Step 3: Roam around the classroom and fill in your table. You should collect data from EVERY person.

Step 4: Create your graph. Be sure to label your axes, title and choose the right type of graph to show your data!

Step 5: Have fun and Be Creative!

Step 6: Turn in both table and graph!

Density

• Density is a physical property of a substance.

• Physical properties can be observed or measured without changing a substance.

• Other physical properties of substances include shape, color, odor, and texture.

Calculating Density

• Density is calculated by dividing an object’s mass by its volume.

• Density = mass/volume or D = m/v

Low and High Density

• A substance with a low density is referred to as being “light”. An example is Styrofoam.

• A substance with a high density is referred to as being “heavy”. An example is iron.

• Density of a liquid is reported in grams per milliliter (g/ml) and a solid is reported in units of grams per cubic centimeter (g/cm3).