Effects on Boiling Point

We have now completed two labs based on Boiling Point:

  1. We found in the first lab that the boiling point of water is around 100 Celsius or 212 Farenheit and that there is a heating curve related to it. The heating curve has plateaus on it because when water is changing state while heat is being added, all of the energy being added goes into changing it from a solid to a liquid or a liquid to a gas and not to raising the temperature.
  2. In our second Boiling Point lab, we tested different volumes of water to compare boiling points. We found that the boiling points were the same regardless of the sample size and that this is a property of matter. We also found that it was the time to boil that changed depending on the amount of water, sample size, that was being boiled.

Now that we have completed those two labs, we are going to move on to other effects on boiling point:

Atmospheric Pressure and Altitude:

Boiling Water at Different altitudes video

Read this article on Boiling Pointtake notes and answer the questions related to the effects that  pressure at different altitudes and  pressure during different weather systems has on the boiling point of water.

(Make sure to add this learning to the Boiling Point section of your ‘scrapbook’!)

Here is an article on Melting Point as well that will help you with this section of Properties of Matter.

Boiling Point and States of Matter Summative Study Guide

Here are some things that will help you to study for the upcoming assessment:

Study Guide for the Matter and BP Summative

Matter Review Questions

Boiling Point Review Questions

Boiling Point Reading

States of Matter Reading

Brain Pop:

Bill Nye: Phases of Matter Video

KS3 Bitesize: Particle Model

Interactive States of Matter and Boiling Point at Different Altitudes:

States of Matter

Click to Run


Boiling Point #2 Debrief

Lab Objective: To figure out if the boiling point of water depends on the sample size.

In your scrapbook you should discuss the following as your learning for the lab:

1. Answer the following questions:

  • At what temperature does water boil?
  • What effect, if any, does the amount of water in the beaker have on the boiling temperature of water? (Look at the class Google doc where everyone has entered their data to help with this question)
  • Does the temperature of the boiling water increase, decrease, or remain the same after the water has boiled for two minutes? If there was a change, why do you think so?

2. Take a screen shot of the class data and graph of the boiling points of different volumes and put it in your scrapbook.