Name: ____________________________
Period:______
LAB 2A PHASE CHANGE DIAGRAMS AND GRAPHS
Simulations of substances changing phase: http://bit.ly/1gynsw2
1. Type in the bit.ly address to go to the simulation page.
2. Click anywhere on the Harcourt page after it loads.
3. For each of the three solids.
a. Read the graph and enter in the melting and boiling temperature. Click check.
b. Copy the phase change graph as a line graph. (no need to color in underneath like they do).
c. Record the melting and boiling temperatures.
d. Label the melting point (mp) and boiling point (bp) on the graph.
Melting Temp________ Boiling Temp ________
Melting Temp________ Boiling Temp ________
Melting Temp________ Boiling Temp ________
Analysis:
What happens to the temperature graph when the substance is melting?_____________________________
What is the substance changing from and to when it is melting? __________________________________
What happens to the temperature graph when the substance is boiling? _____________________________
What is the substance changing from and to when it is boiling? __________________________________
What is true about a substance’s phase when its temperature is increasing? _________________________
Fill in the table below.
1. Draw a model of what the substance in the beaker looks like in each of its phases for the macroscopic drawing.
2. Draw a model of what the particles look like, showing correct spacing between particles.
Refer to this website if you need assistance with the microscopic diagrams:
http://www.dlt.ncssm.edu/tiger/Flash/phase/HeatingCurve.html
PHASE
SOLID
SOLID/LIQUID
LIQUID
LIQUID/GAS
GAS
Temp. increases
as you heat the
solid.
Temp. _______
as solid melts
Temp. ________
as you heat
liquid.
Temp. _______
as you vaporize
the substance
(change from
liquid to gas).
Temp. _______
as you heat the
gas.
MACROSCOPIC
DRAWING OF
BEAKER AND
CONTENTS
MICROSCOPIC
DRAWING OF
BEAKER
CONTENTS
STATE WHAT IS
HAPPENING TO THE
TEMPERATURE.
DRAW THE SHAPE
OF THE
TEMPERATURE
GRAPH LINE FOR
EACH PHASE OR
PHASE CHANGE.
5. Look at your particle drawings. What happens to the density of the substance as it changes from a liquid to a
gas? Explain how you know.
______________________________________________________________________________________
____________________________________________________________________________________________
6. What happens to the density of the substance as it changes from a solid to a liquid? Be careful to observe the
solid and liquid together. Explain your evidence.
____________________________________________________________________________________________
____________________________________________________________________________________________