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C1b
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- 1Hazard symbols, Acids and Alkali's
- 2Substances can be Acids , Bases or neutral An acid = substance with pH less than 7. A base = substance with pH more than 7. An alkali is a base that dissolves in water.Acid and base react together to form salt and water. The products are neutral so its called a neutralization reaction.
ACID + BASE = SALT + WATER - 3Hydrochloric acid and indigestion tablets Stomach produces H. acid Acids > useful for the body Stomach produces H. acid + helps enzymes bcz enzymes work best in acidic environment. Acid kills bacteria in stomach.QUICK QUIZ:
1) Give me a name of a hazard symbol and describe its dangers.
2) Fill in the gaps : Acid + ______= Salt + __
3) What is an acid ?
A) Substance with pH level 7
B) Substance with pH level greater than 7
C) Substance with pH level Lower than 7
D) A substance that is unreactive. - 41) Crush one dose & dissolve in water in conical flask. 2) Add 3 drops of indicator to flask. This will change colour when solution neutralized. 3) Fill a burret with H.acid. 4) Using burette add acid to flask and swirl it. 5) When indicator changes color, all alkali has been neutralized so stop adding acid. 6) Read the burette to work out volume of acid you added in alkali. 7) Repeat experiment.
- 5Reactions of Acids: 1) Metal oxide and metal hydroxides are often bases 2) They can be neutralized with acids to form salt and water. For eX: Acid + Metal oxide > Salt + Water Acid + Metal Hydroxide > Salt + Water
- 6Acid + Metal Carbonate = Salt + H2O + CO2 Carbonates give off CO2 when neutralized with acids.
- 7Electrolysis means splitting up with electricity. 1) It is the breaking down of a compound using electrical energy. 2) It requires liquid to conduct the electricity 3) The electricity is applied to the electrolyte with 2 electrodes. 4) Electrolyte contains the compound which is broken down into component parts. 5) Component parts are released as atoms or molecules.
- 8Test for Chlorine + Hydrogen gases Chlorine bleaches damp litmus paper (White colour) Hydrogen makes a squeaky pop with a lighted splint.
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- Fichas sobre C1b , creado por Kers_Ops el 09/01/2016.
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