//   SAVE YOURSELF HOURS...
//   IMPORT THESE COMMENTS INTO: SchoolReportWriter.COM

//   No.1 in GOOGLE - "BEST TEACHER REPORTS APP":

//   - TRUSTED by 1000s of teachers, since 2012
//   - QUICKLY create personalised reports
//   - PASTE into your school system, Word etc
//   - GENDER NEUTRAL option
//   - DEMO video at SchoolReportWriter.COM

//   FOR HELP see end of this document.


//   IMPORTANT NOTE / DISCLAIMER:
//
//   This file is from the old 'freeducation' website. They recently stopped
//   their download service and all 350 of their primary school report comment
//   files are now at SchoolReportWriter.COM - the files (including this)
//   are in the old Teacher Report Assistant format but will be automatically
//   converted when imported at SchoolReportWriter.COM - you can then
//   take advantage of our FREE online report writer's advanced features.

//   500 MORE COMMENTS FILES (often much larger) at SchoolReportWriter.COM


Introduction
The unit 'Reversible and irreversible changes' brought together and consolidated the work that # has done before on reversible changes e.g. melting, freezing, evaporating, dissolving, and condensing. In addition, ^ was introduced to burning as a change that cannot be reversed and, like other irreversible changes, ^ learnt it produces new materials. ~ experimental and investigative work focused on * making ~ own careful observations and suggesting explanations for ~ observations, using ~ scientific knowledge and understanding. The work in this unit also offered * several  opportunities to use ~ scientific knowledge and understanding to explain and interpret a range of everyday changes.
"
Dissolving
Section 1: Mixing materials with water & Section 2: Filtration and evaporation

^ has used ~ observations of what happened when solids were added to water to group them and justify ~ groupings. 
^ could describe how a solid which does not dissolve and one which does can be recovered from water.
^ has explained in terms of the size of the particle why different methods have to be used.
^ is able to recognise that filtration and evaporation changes are reversible.
"
New Materials
Section 3: Making new materials

^ was able to recognise that when there is vigorous bubbling a gas is being released.
^ is able to identify some changes as irreversible and ^ could explain ~ reasons for doing so.
"
HeatingCooling
Section 4: Heating and cooling materials

^ was able to describe what happens to some materials when they are cooled e.g. water and steam and say whether these changes were easily reversed. 


"
Burning
Section 5: Burning & Section 6: Hazards of burning

^ has described what is seen when common materials e.g. wax, wood, natural gas are burned.
^ recognises that when a material is burnt new materials are formed, such as ash and gases that cannot be seen.
^ classifies burning as an irreversible change. 
# is able to identify the hazards associated with burning materials.
"
Comment 6

"