Posts Tagged ‘solubility’

Oceans topic performance task

Wednesday, March 30th, 2011

Flooding from tsunami near Sendai, Japan by NASA Goddard Photo and Video on flickr

No one can have failed to be shocked by the recent earthquake and tsunami in northern Japan. 

The final perfomance task for this unit requires you to take what you have learned about water, solubility, osmosis, and use it to answer this problem:-

Read this document for details of the performance task.  oceans performance task

Here are the rubrics that will be used to grade your work. Rubric for performance task – oceans  FINALRubric DCP

Solubility graphs

Wednesday, January 26th, 2011

Here are the worksheets we used in class.  Print extra copies if you need to practice further. GCSE Water 04 big  GCSEWater03

This is the lab sheet for the KNO3 crystallization experiment.  Make sure you READ through the procedure before class so that you know exactly what to do when you get here.  solubility curve of potassium nitrate in water

Solubility

Tuesday, January 11th, 2011

Graduated cylinders and beaker filled with chemical compoundsSolute + solvent = solution

We’ll investigate factors affecting solubility by designing an experiment, then performing it and reporting on it.  Here are the rubrics that will be used to guide this. FINAL Rubric design  FINALRubric DCP   FINAL Rubric CE

This link has some useful information to help you explain your findings.

We’ll learn about saturated solutions and what actually happens when a substance dissolves.  We’ll also make some predictions as to the kinds of substances that can dissolve in water.

Water – the liquid of life

Thursday, December 2nd, 2010

pondskater by Robbie G1 on flickr

Our new unit is about OCEANS.  In this unit we will cover all kinds of interesting ideas, but we’ll start by looking at the structure and properties of waterThis site has a ton of information on water.  This is another good one.  These videos are useful to help you understand both the structure and the properties. One. Two. ThreeFour

Now try and answer these questions:-

  • Why are water molecules considered to be sticky?  Can you give examples of where this is useful in nature?
  • How can insects like pondskaters walk on water? [See picture] Or how can this lizard run on water?
  • Why can fish survive in a pond during the winter when the pond freezes over?
  • Water is a very good solvent.  This means it dissolves many substances.  What makes it so good as a solvent? 
  • Water is used to transport substances in our body.  Give the names of 2 liquids in our bodies that contain water, and say what they dissolve.
  • Why do we cool down when we sweat?