Lesson Lesson Innovation Of Properties Too Uses Of Acids (Acids, Alkalies Too Salts) Full General Scientific Discipline Form Viii

Lesson Plan of Properties together with Uses of Acids (Acids, Alkalies together with Salts)

General Science Grade VIII

Students’ Learning Outcomes

·         Define acid inwards its ain words.

·         Describe the properties of acids.

·         Explain the uses of acids inwards daily life.

Information for Teachers

·         Acids are the chemic substances which plough over H’ ion inwards aqueous solution.

·         Acids accept sour taste.

·         Hydroelectric acid is establish inwards our stomach.

·          Citric acid inwards vitamin c.

·         They modify bluish litmus newspaper to red.

·         Acids react alongside bases to cast tabular array salt together with H2O (neutralization)

·         Acidic solutions are skilful electrical conductors. Due to ionization inwards solution they cast gratis mobile ions which bear electricity.

·         Acids are used inwards the production of metal, paper, paint, detergent together with fertilizers.

·         Nitrite acid is used to brand fertilizers similar ammonium nitrate. Sulfuric acid is used every bit abode cleaner together with likewise inwards auto batteries.

·                                                                                                                                                Source of Acids:

 

Concept Map

·         Aqua Regina tin sack dissolve gold. It is made yesteryear adding 1 part concentrated nitrite acid to iii parts of concentrated hydroelectric acid.

·         Sulfuric acid is used inwards almost all auto batteries together with likewise known every bit “Oil of Vitriol”.

·         The ‘fizz’ inwards soft drinks is produced yesteryear adding carbolic acid (H2 CO3)

·         Acetic acid is extensively used inwards nutrient manufacture every bit a preservative.

·         Acid accept a pH less than 7.

Material / Resources

For each grouping yous require: bluish litmus papers, vinegar, beakers, lemon juice, water, stirrer, together with pH

Worm upward activeness

·         Write the word, “Acidic solution”, on the board together with inquire students to plough over their ideas most it.

·         Write all their ideas on the board.

·    

Development

Activity 1

·         Divide students inwards groups together with teach them to:

o   Dip bluish litmus newspaper inwards vinegar.

o   Observe what happens to the bluish litmus paper.

·         Now inquire these questions:

o   What is the modify inwards color of bluish litmus paper?

o   Vinegar is an edible acid; tin sack yous predict its taste? (Don’t allow children to sense of savor anything inwards laboratory)

·         After getting students response, conclude the activeness yesteryear telling them that vinegar changes the bluish litmus newspaper into ruby-red because it is acidic inwards nature & it is sour inwards taste.

Activity 2

·         Divide students inwards pairs together with teach them to :

o   Take little total of lemon juice inwards beaker H5N1 together with H2O inwards beaker B.

o   Dip bluish litmus newspaper inwards both the solutions.

o   Observe what happens to the bluish litmus on dipping inwards the ii solutions.

·         Now inquire the next questions:

o   Did yous meet whatever modify inwards the color of bluish litmus paper?

o   What is the color departure of ii litmus papers dipped inwards dissimilar solutions inwards beaker H5N1 together with B?

·         Conclude the activeness yesteryear telling that beaker ‘A’, turned bluish litmus newspaper into ruby-red every bit lemon juice is acidic inwards nature piece beaker ‘B’, doesn’t impact the bluish litmus newspaper because contains H2O that is neutral.

Activity 3

·         Divide students inwards little groups together with teach them to:

o   Take ii beakers, label them H5N1 together with B .

o   Half fill upward the ii beakers alongside water.

o   Add 1 teaspoon of vinegar inwards beaker A.

o   Add five teaspoons of vinegar inwards beaker B.

o   Stir these mixtures.

o   Dip the strips of pH newspaper inwards the ii solutions.

o   Note the pH values of both the solutions.

·         Now, inquire the next questions:

o   What are the pH values of ii solutions?

o   Which of the ii solutions (A together with B) has smaller pH value together with why?

·         Conclude the activeness yesteryear telling the students that the solution inwards beaker ‘A’, is dilute together with solution inwards beaker ‘B’ is concentrated. PH value of concentrated solution is less than pH value of dilute solution.

·        

Sum upward / Conclusion

·         Teacher tin sack conclude the lesson yesteryear telling children that they leant about:

o   Acids plough over H’ ions inwards aqueous solutions together with plough bluish litmus newspaper red.

o   Acids are of smashing role inwards fertilizers, auto batteries together with industries etc.  

o   Acidic solutions are skilful electrical conductors inwards solutions.

Assessment

·         Why does acid pelting destroy buildings peculiarly those made from limestone (a cast of calcium carbonate)?

(Expected response: Acid pelting contains oxides of sulfur (SO2), which forms sulfuric acid on reacting alongside water. Acids accept a corrosive consequence together with tin sack elbow grease limestone edifice to dissolve).

·         Name a fruit together with a vegetable that is acidic inwards nature. How did yous gauge it?

(Expected response: Fruit: Oranges Vegetable: Lemon. They accept sour taste.)

·         Haynes has some transparent liquid, which she claims to move an acid. How tin sack yous attempt or disprove her claim?

(Expected response: Dip a bluish litmus newspaper inwards transparent liquid. it becomes ruby-red which proves that it is an acid)

Follow up

·         Ask the students to laid upward a booklet on acids. The booklet should comprise colorful pictures related to the sources, uses together with properties of whatever ii acids of your choice.

art%20concentrated%20nitric%20acid%20to%20three%20parts%20of%20concentrated%20hydrochloric%20acid.%20%E2%80%A2Sulfuric%20acid%20is%20used%20in%20almost%20all%20car%20batteries%20and%20also%20known%20as%20%E2%80%9COil%20of%20Vitriol%E2%80%9D.%20%E2%80%A2The%20%E2%80%98fizz%E2%80%99%20in%20soft%20drinks%20is%20produced%20by%20adding%20carbonic%20acid%20(H2%20CO3)%E2%80%A2Acetic%20acid%20is%20extensively%20used%20in%20food%20industry%20as%20a%20preservative.%20%E2%80%A2Acid%20have%20a%20pH%20less%20than%207.Material%20/%20ResourcesFor%20each%20group%20you%20require:%20blue%20litmus%20papers,%20vinegar,%20beakers,%20lemon%20juice,%20water,%20stirrer,%20and%20pHWorm%20up%20activity%20%E2%80%A2Write%20the%20word,%20%E2%80%9CAcidic%20solution%E2%80%9D,%20on%20the%20board%20and%20ask%20students%20to%20give%20their%20ideas%20about%20it.%20%E2%80%A2Write%20all%20their%20ideas%20on%20the%20board.%E2%80%A2image%20DevelopmentActivity%201%E2%80%A2Divide%20students%20in%20groups%20and%20instruct%20them%20to:oDip%20blue%20litmus%20paper%20in%20vinegar.oObserve%20what%20happens%20to%20the%20blue%20litmus%20paper.%20oimg%E2%80%A2Now%20ask%20these%20questions:oWhat%20is%20the%20change%20in%20color%20of%20blue%20litmus%20paper?oVinegar%20is%20an%20edible%20acid;%20can%20you%20predict%20its%20taste?%20(Don%E2%80%99t%20allow%20children%20to%20taste%20anything%20in%20laboratory)%E2%80%A2After%20getting%20students%20response,%20conclude%20the%20activity%20by%20telling%20them%20that%20vinegar%20changes%20the%20blue%20litmus%20paper%20into%20red%20because%20it%20is%20acidic%20in%20nature%20&%20it%20is%20sour%20in%20taste.Activity%202%E2%80%A2Divide%20students%20in%20pairs%20and%20instruct%20them%20to%20:oTake%20small%20amount%20of%20lemon%20juice%20in%20beaker%20A%20and%20water%20in%20beaker%20B.oDip%20blue%20litmus%20paper%20in%20both%20the%20solutions.oObserve%20what%20happens%20to%20the%20blue%20litmus%20on%20dipping%20in%20the%20two%20solutions.oimg%E2%80%A2Now%20ask%20the%20following%20questions:oDid%20you%20see%20any%20change%20in%20the%20color%20of%20blue%20litmus%20paper?oWhat%20is%20the%20color%20difference%20of%20two%20litmus%20papers%20dipped%20in%20different%20solutions%20in%20beaker%20A%20and%20B?%E2%80%A2Conclude%20the%20activity%20by%20telling%20that%20beaker%20%E2%80%98A%E2%80%99,%20turned%20blue%20litmus%20paper%20into%20red%20as%20lemon%20juice%20is%20acidic%20in%20nature%20while%20beaker%20%E2%80%98B%E2%80%99,%20doesn%E2%80%99t%20affect%20the%20blue%20litmus%20paper%20because%20contains%20water%20that%20is%20neutral.%20Activity%203%E2%80%A2Divide%20students%20in%20small%20groups%20and%20instruct%20them%20to:oTake%20two%20beakers,%20label%20them%20A%20and%20B%20.oHalf%20fill%20the%20two%20beakers%20with%20water.oAdd%20one%20teaspoon%20of%20vinegar%20in%20beaker%20A.oAdd%205%20teaspoons%20of%20vinegar%20in%20beaker%20B.oStir%20these%20mixtures.oDip%20the%20strips%20of%20pH%20paper%20in%20the%20two%20solutions.oNote%20the%20pH%20values%20of%20both%20the%20solutions.%20oimg%E2%80%A2Now,%20ask%20the%20following%20questions:oWhat%20are%20the%20pH%20values%20of%20two%20solutions?oWhich%20of%20the%20two%20solutions%20(A%20and%20B)%20has%20smaller%20pH%20value%20and%20why?%E2%80%A2Conclude%20the%20activity%20by%20telling%20the%20students%20that%20the%20solution%20in%20beaker%20%E2%80%98A%E2%80%99,%20is%20dilute%20and%20solution%20in%20beaker%20%E2%80%98B%E2%80%99%20is%20concentrated.%20PH%20value%20of%20concentrated%20solution%20is%20less%20than%20pH%20value%20of%20dilute%20solution.%E2%80%A2imgSum%20up%20/%20Conclusion%E2%80%A2Teacher%20can%20conclude%20the%20lesson%20by%20telling%20children%20that%20they%20leant%20about:oAcids%20give%20H%E2%80%99%20ions%20in%20aqueous%20solutions%20and%20turn%20blue%20litmus%20paper%20red.%20oAcids%20are%20of%20great%20use%20in%20fertilizers,%20car%20batteries%20and%20industries%20etc.%20%20oAcidic%20solutions%20are%20good%20electrical%20conductors%20in%20solutions.%20Assessment%E2%80%A2Why%20does%20acid%20rain%20destroy%20buildings%20especially%20those%20made%20from%20limestone%20(a%20form%20of%20calcium%20carbonate)?(Expected%20response:%20Acid%20rain%20contains%20oxides%20of%20sulfur%20(SO2),%20which%20forms%20sulfuric%20acid%20on%20reacting%20with%20water.%20Acids%20have%20a%20corrosive%20effect%20and%20can%20cause%20limestone%20building%20to%20dissolve).%E2%80%A2Name%20a%20fruit%20and%20a%20vegetable%20that%20is%20acidic%20in%20nature.%20How%20did%20you%20guess%20it?(Expected%20response:%20Fruit:%20Oranges%20Vegetable:%20Lemon.%20They%20have%20sour%20taste.)%E2%80%A2Ayesha%20has%20some%20transparent%20liquid,%20which%20she%20claims%20to%20be%20an%20acid.%20How%20can%20you%20prove%20or%20disprove%20her%20claim?(Expected%20response:%20Dip%20a%20blue%20litmus%20paper%20in%20transparent%20liquid.%20it%20becomes%20red%20which%20proves%20that%20it%20is%20an%20acid)Follow%20up%E2%80%A2Ask%20the%20students%20to%20prepare%20a%20booklet%20on%20acids.%20The%20booklet%20should%20contain%20colorful%20pictures%20related%20to%20the%20sources,%20uses%20and%20properties%20of%20any%20two%20acids%20of%20your%20choice." imageanchor="1" style="margin-left: 1em; margin-right: 1em;">

 

Buat lebih berguna, kongsi: