Y7 dissolving

<body topmargin=0 leftmargin=0 marginheight=0 marginwidth=0> <table cellpadding=0 cellspacing=0 border=0 height="100%"><tr> <td valign="top" width=200 BGCOLOR="#003333" TEXT="#F7F7FF" background="03fd4c00dduajq.png"> <div> <TABLE BORDER="0" CELLPADDING="2" CELLSPACING="0" WIDTH="95" BORDERCOLORLIGHT="#C0C0C0" BORDERCOLORDARK="#808080" FRAME="BOX" RULES="ALL" HSPACE="0" VSPACE="0" > <tR> <tD VALIGN=TOP HEIGHT= 46 WIDTH="91"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="46" ALIGN="bottom" WIDTH="91" HSPACE="0" VSPACE="0"></tD> </tR> </TABLE></div> <DIV ALIGN="LEFT"></DIV> <div> <A HREF="index.htm" TARGET="_top" TITLE="Science For All"><U>home</U></A></div> <div> <A HREF="site_map_and_site_search_engine.htm" TARGET="_top" TITLE="Science for all site map"><U>Site map + site search engine</U></A></div> <bR> <div> <A HREF="y7_materials.htm" TARGET="_top" TITLE="Y7 switchboard"><U><IMG SRC="14a32320.gif" border=0 width="50" height="50" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></U></A> <A HREF="y7_materials.htm" TARGET="_top" TITLE="Y7 switchboard"><U>Y7 switchboard</U></A></div> <bR> <div> <A HREF="id22.htm" TARGET="_top" TITLE="Y7 Natural and synthetic materials "><U>Y7 Natural and synthetic materials </U></A></div> <div> <B><IMG BORDER="0" SRC="Symb075c00b700c8ffffcc00.png" HEIGHT="13" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">Y7 dissolving</B></div> <div> <A HREF="springs.htm" TARGET="_top" TITLE="Y7 Stretching"><U>Y7 Stretching</U></A></div> <div> <A HREF="id78.htm" TARGET="_top" TITLE="Y7 mass and weight"><U>Y7 mass and weight</U></A></div> <div> <A HREF="id80.htm" TARGET="_top" TITLE="Y7 Fossil fuels"><U>Y7 Fossil fuels</U></A></div> <div> <A HREF="id85.htm" TARGET="_top" TITLE="Y7 Adaptations to winter"><U>Y7 Adaptations to winter</U></A></div> <div> <A HREF="id100.htm" TARGET="_top" TITLE="Simple chemical reactions"><U>Simple chemical reactions</U></A></div> <bR> <div> <A HREF="links.htm" TARGET="_top" TITLE="Home page for teachers"><U>Home page for teachers</U></A></div> <bR> <bR> </td> <td valign="top" BGCOLOR="#FFFFFF" TEXT="#080000" bgproperties="fixed" background="05379803.png"> <div> Y7 dissolving</div> <bR> <div> You are visiting the Science For All site</div> <div> <IMG SRC="06018050.png" border=0 width="536" height="5" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"> <FONT SIZE="1" COLOR="#333399" FACE="Arial" >  </FONT></div> <div> Aims of activity:</div> <bR> <div> <IMG BORDER="0" SRC="Symb075c00b700f000000000.png" HEIGHT="16" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">To enable pupils to use the correct words when describing a variety of mixtures.</div> <div> <IMG BORDER="0" SRC="Symb075c00b700f000000000.png" HEIGHT="16" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">To enable pupils to recognise that when something has dissolved it is still there but cannot be seen in its original form.</div> <div> <IMG BORDER="0" SRC="Symb075c00b700f000000000.png" HEIGHT="16" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">To enable pupils to recognise the general differences between solutions and suspensions in preparation for the study of separating mixtures.</div> <bR> <div> Needs:</div> <bR> <div> <IMG BORDER="0" SRC="Symb075c00b700f000000000.png" HEIGHT="16" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">250 ml plastic beakers X 2, spatulas X 2, copper carbonate and copper sulphate (as small crystals or powder).</div> <bR> <div> Outline of activity:</div> <bR> <div> Dissolving race between two pupils. I usually cheat and use copper carbonate and copper sulphate. It helps to pour the resulting solution and suspension into glass beakers so that the rest of the class can see the result. Cover the idea of how they know who has won i.e. the idea that when something has dissolved its solid form  disappears but it is still present since the water has now changed colour. Follow this with pairs work using speaking and listening skills – one reads out the first paragraph and asks 4 questions of the person listening. Then they swap, the second person reads the next two paragraphs. Students then move on to the written tasks.</div> <bR> <div> Student sheets: </div> <bR> <div> <I><B>Dissolving – information:</B></I></div> <bR> <div> Some chemicals seem to disappear when they are stirred with water. When this happens, we say the substance has <I><B>dissolved</B></I>. Example: When sugar is put into water or tea it seems to disappear. It must still be there because the water or tea tastes sweet. A substance which dissolves is called a <I><B>soluble </B></I>substance. A substance that does not dissolve is called an <I><B>insoluble </B></I>substance. Insoluble substances form <I><B>suspensions </B></I>with water. A suspension is opaque or translucent. </div> <bR> <div> It is not just water that dissolves things, any liquid which dissolves things is called a <I><B>solvent</B></I>. Water is a solvent so is petrol and nail varnish remover. You will meet many more solvents throughout your life. When any substance dissolves, we say that a <I><B>solution </B></I>has been made. A solution is a mixture that contains a soluble substance and a solvent. </div> <bR> <div> When talking about a solution, the substance that has dissolved is given a special name. It is called the <I><B>solute</B></I>. The solute is therefore a dissolved substance. In a cup of sweet tea, the solute is sugar, the solvent is tea.</div> <bR> <bR> <div> <I><B>Dissolving - written tasks:</B></I></div> <bR> <div> 1      On <I><B>rough </B></I>paper - write down the important words (the <I><B>highlighted </B></I>ones)      from the dissolving information sheet. Write down what each one means. <I><B>Work as a group</B></I>, you each write everything down.</div> <bR> <div> 2         Now<I><B> work on your own</B></I>. Put the title “<I><B>Dissolving</B></I>” into your science book. <I><B>Explain </B></I>what dissolving is in your own words. Copy your <I><B>definitions </B></I>of the important dissolving words into your science book.</div> <bR> <div> 3         If you get time, make up a word search of dissolving words. Give a <I><B>clue </B></I>for each word to be found. If you start this, it must be finished, even if this means doing it as extra homework.</div> <bR> <div> Homework: </div> <bR> <div> <IMG BORDER="0" SRC="Symb075c00b700f000000000.png" HEIGHT="16" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">Produce a crossword or word game with clues to cover the key words from the lesson. </div> <bR> <div> Assessment:</div> <bR> <div> <B><IMG BORDER="0" SRC="Symb075c00b700f000000000.png" HEIGHT="16" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">Levels 4/5</B> – increasing use of scientific terms to describe the changes that they see. </div> <bR> <div> Links:</div> <bR> <div> <IMG BORDER="0" SRC="Symb075c00b700f000000000.png" HEIGHT="16" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">Solids, liquids and gases, simple particle theory (dissolving), mixtures and separating mixtures.</div> <div> <IMG BORDER="0" SRC="Symb075c00b700f000000000.png" HEIGHT="16" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">Cross curricular links to English speaking and listening.</div> <div> <IMG BORDER="0" SRC="Symb075c00b700f000000000.png" HEIGHT="16" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">Possible ICT links could be to produce a dissolving information leaflet/magazine/newspaper article aimed at a particular audience or perhaps the production of a web page on the school intranet/internet site. I have not tried this but think it would be worth it if time allows.</div> <bR> <div> Follow up lessons:</div> <bR> <div> <IMG BORDER="0" SRC="Symb075c00b700f000000000.png" HEIGHT="16" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">Separating a variety of mixtures, incorporating as many of the dissolving words as possible.</div> <div> <IMG BORDER="0" SRC="Symb075c00b700f000000000.png" HEIGHT="16" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">Powerpoint presentation to reinforce the key words. Students drag the definitions and labels into place and then animate the final presentation to make it more interesting.</div> <bR> <div>  <a href="HTMLobj-532/Separating_mixtures.ppt"><img align="bottom" border="0" width="55" height="22" alt="Powerpoint activity" src="HTMLobj-532/pencil.GIF"> <u>Powerpoint activity</u></a>   <A NAME="powerpoint_dissolving"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="1" ALIGN="bottom" WIDTH="1" HSPACE="0" VSPACE="0" ></A></div> <bR> <div> <IMG BORDER="0" SRC="Symb075c00b700f000000000.png" HEIGHT="16" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0"><A NAME="solubility"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="1" ALIGN="bottom" WIDTH="1" HSPACE="0" VSPACE="0" ></A>Solubility - 2 lessons. <B>First lesson</B> - Introduce the theory of dissolving with the traditional ethanol/water and rice/peas demonstrations. Follow up with the idea of different solubilities of different chemical compounds. Use salt, sugar and sodium hydrogen carbonate to investigate which is the most soluble and to reinforce the ideas of fair testing and evaluation (weigh out 5g of each chemical, progressively dissolve it until no more will dissolve. Weigh what is left).Collate the class results and discuss why the results are all over the place! <B>Second lesson </B>- saturated solutions and crystallisation to begin with followed by the <A HREF="id96.htm" TARGET="_top" TITLE="solubility"><U>differentiated worksheet</U></A>.</div> <bR> <bR> <bR> </td> </tr></table></body>