Soluble and Insoluble Materials

Transcript

What happens when we mix Salt or Sugar in Water?Salt disappears Sugar disappears We say Salt is soluble in water We say Sugar is soluble in water What happens when we mix Sand or Sawdust in Water?Sand does not disappears Sawdust does not disappear We say Sand is insoluble in water We say Sawdust is insoluble in water Difference Between Soluble and Insoluble MaterialsSoluble Material Insoluble Material Soluble materials are those materials that dissolve in water Insoluble materials are those materials that do not dissolve in water Example :- Salt, Sugar Example :- Sand, Sawdust What if we mix Liquid in Water?Mixing Milk in Water Mixing Oil in Water Milk mixes in Water So it is Soluble Oil does not mix in Water So it is Insoluble What if we mix Liquid in Water?Mixing Vinegar in Water Mixing Honey in Water Vinegar mixes in Water So it is Soluble Honey mixes in Water So it is Soluble Are Gases also soluble in Water?Highly Soluble Gases Oxygen, Carbon Dioxide Very Less Soluble Gases Nitrogen Insoluble Gases Hydrogen and Helium How are Fish able to breathe in Water?We know that Oxygen is Soluble in Water Fish have Gills They use Gills to extract Oxygen from Water Soluble in Water Insoluble in Water SOLIDS SALT SAND SUGAR SAWDUST LIQUIDS MILK OIL VINEGAR HONEY GASES OXYGEN HYDROGEN CARBON DIOXIDE NITROGENWhat is ORS ? Why is it given?ORS is Oral Rehydration Solution It is used to treat dehydration due to diarrhoea etc When a person is suffering from Diarrhoea then there is a loss of water and salts in body These ready - made ORS packets are available in primary health centres and also in the market Each packet is dissolved in a litre of water before use How to make ORS at Home?Boil 1 Litre Water Cool Boiled Water 6 Teaspoons of Sugar Half a Teaspoon of Salt and mix ORS can be prepared at home by mixing six teaspoons of sugar and half a teaspoon of common salt in one litre of boiled and cooled water Which property of material used to make ORS ? Property of Solubility Sugar and Salt are soluble in water Table 6.5Collect small amounts of sugar, salt, chalk powder, sand and sawdust. Take five glass tumblers and fill them about two-third with water. Put a teaspoonful of sugar in the first glass tumbler, salt in the second one, chalk powder in the third, sand in the fourth and sawdust in the fifth glass tumbler. On stirring, predict what will happen in each case. Wait for a few minutes and watch what happens. Write down your observations in Table 6.5 Table 6.5Table 1: Table 6.5: Mixing different materials in water \captionsetup{labelformat=empty} Material Prediction Observation Will disappear in water/will not disappear in water Disappears in water/ does not disappear in water Sugar Will Disappear in Water Disappears in Water Salt Will Disappear in Water Disappears in Water Chalk powder Will Disappear in Water Does not Disappears in Water Sand Will not Disappear in Water Does not Disappears in Water Sawdust Will not Disappear in Water Does not Disappears in Water Vinegar Will Disappear in Water Disappears in Water