Name

Date Pd

Chemistry – Unit 3 Lab: Icy Hot

Intro/Pre-Lab Discussion:

We will now explore the changes that take place when attracting particles of matter change from one phase to another. We will also study the relationship between energy (and its transfer through heating) and temperature. You will use LoggerPro and a temperature probe to measure the temperature of a beaker of water as it changes phase from solid to liquid to gas.

Problem Statement / Prediction After reading through the entire handout,

Write a problem statement in the lab notebook

Predict what a temperature vs. time graph would look like for this process. (What will happen to temperature as time goes by, as energy is continuously added). Sketch the graph in your lab notebook

Apparatus & Materials

As you read through the procedures, highlight or underline in colored pencil all materials or chemicals used in the lab.

Draw a labeled diagram of the experimental set up into the lab notebook

Procedures

  1. Refer to “LoggerPro Instructions for Icy Hot” to set up the Logger Pro and computer for the experiment.
  2. Record qualitative observations into the lab notebook throughout the experiment.
  3. Fill a 600 mL beaker about 2/3 full of crushed ice. Place the beaker on the ring stand and light the burner. Immediately click on “Collect “ button on the computer.
  4. Heat the beaker gently with a Bunsen burner as the ice melts (keep the flame well below the beaker). Throughout the lab, gently stir the sample with a stirring rod.
  5. Once the water is all liquid, then you can carefully lower the beaker on the ring stand to increase the rate at which energy is supplied to the sample. CAUTION: The ring stand will be very hot. Use a pot holder to touch the ring stand, while one of your lab partners holds the beaker with a hot-hand protector.
  6. Continue collecting temperature readings every 30 seconds until the water sample has been boiling 5 minutes.
  7. Click on the “Stop” button on the computer to stop collecting data.

Data – Processing

When you finish collecting data:

  • You may click on A on the tool bar to scale the graph.
  • Open a Word document
  • Right click on the graph and copy; paste into Word
  • Open an Excel document
  • Copy the data table in LoggerPro and paste it into Excel
  • Save the Word and Excel documents into your folder OR onto a flash drive

Sketch the graph onto the left page of the lab notebook.

Turn the computer off and wind up the blue cable.

It is the responsibility of EACH person to get copies of the Word and Excel files to be used for the lab report. This needs to be done by this FRIDAY. Printing and taping a graph or data table into the lab report IS NOT ACCEPTABLE.

ICY HOT LAB REPORT

EXPERIMENTAL BACKGROUND

Problem Statement

Prediction - sketched prediction graph from before data collection

EXPERIMENTAL DESIGN

Materials & Equipment - list all materials and equipment in column(s)

Diagram of set-up

  • all equipment and materials must be labeled
  • BLACK ink
DATA COLLECTION & PROCESSING
Data Table with all times and temperatures
  • Appropriate title
  • Column headings on all columns
  • Units in column headings only
  • Correct significant figures
  • Entire table on one page

Qualitative observations

Graph from LoggerPro
  • Graph embedded into Word document (not cut out and taped)
  • Appropriate title
  • After printing lab report, draw a smooth curve through the data points and label three regions:
  • A – low temperature plateau
  • B – temperature change
  • C – high temperature plateau
CONCLUSIONS & EVALUATION

Conclusion – Write paragraphs to address the following questions in your Conclusion. Be sure to base your answers (your conclusions) on reasonable interpretations of the data and provide justification.

1.Did the process in this lab involve a chemical change? Explain why or why not.

2.Did the system absorb or release energy? Explain which.

3.For each region on your graph (A, B, and C):

  1. describe how the energy supplied by the burner was stored by the system (Eth or Eph)
  2. state what phase(s) of matter were present
  3. draw a particle model at the molecular level that shows how the water molecules were behaving.

4.How would increasing the rate of heating by using two burners affect the shape of the curve? Explain.

Evaluation – Describe at least three limitations or weaknesses of this experiment.

Note: You are evaluating the experimental process, not the instructions or the scientists.

Modeling Chemistry1U3 Lab – Icy Hot v. ‘07