Graphing Data

Variables Independent Variable: causes a change Dependent Variable: depends on independent Ex. Time is always independent…always changes Speed depends on the time  it’s dependent

X axis : Independent variable Y-axis: Dependent variable Slope: Rise/Run

Graph 1: Density of Magnesium Y=mx+b Slope is: m =y2-y1= 51-17 = 1.7 x2-x1 30-10 Independent: Volume Dependent: Mass Observations: as the volume of the magnesium increased, the mass of magnesium also increased.

Graph 2: Boyle’s Law Independent: Pressure Dependent: Volume Observations: as the pressure increased the volume of the gas decreased.

Conclusion: What are differences in graph 1 & 2 Graph 1: is a direct relationship Graph 2: is a opposite (inverse) relationship

Graph 1 is….. Directly Proportional One variable goes up the other variable goes up and vice versa Directly Proportional

Graph 2 is …. Inversely Proportional One variable goes up the other variable goes down and vice versa Inversely Proportional

Practice

Independent: Time Dependent: Amount As time progressed, the amount of cesium decreased This is a inversely proportional graph

As temperature increases, the amount of solute in the water increases. Independent: Temperature Dependent: Solute/Solvent As temperature increases, the amount of solute in the water increases. This is a directly proportional graph

As temperature increases, the volume of hydrogen gas increases. Independent: Temperature Dependent: Volume As temperature increases, the volume of hydrogen gas increases. This is a directly proportional graph