Week of 12/1/14

It’s 12/1/14, good morning! Distinguish between acids and bases and use indicators (including litmus paper, pH paper, and phenolphthalein) to determine their relative pH objective: discuss the pH scale and acids, the tests, properties and examples. Agenda for today 1. Bell \ringer: What do you think some acids are in your everyday life? 2. pretest 3.Competition for celebration 4.Study guide 5.Ppt on pH scale and acids

Pretest for acids and bases Name Date period

It’s a party celebration Academics first– everyone passes each assessment. I can only help with the top class but others can earn a celebration.

When do we start? Today

How do we earn ornaments for our tree? 1. Academics first: – A. Hw  ornament – B. 100% hw  5 ornaments – C. 100% passing assessments  5 ornaments 2.Responsibilities next: a. clean up room b. No blurt outs—5 ornaments/reduced b.o.  1-4 ornaments c. 100% textbooks d. 100% with materials out when I come in from hallway. 3.Then courtesy: a. Helping other b. Ma’am, sir, please, thank you c. Good note from principal or sub

How do we lose ornaments? 1.blurting out 2.No books 3.No materials 4.Not paying attention 5.Leaving trash 6.Inappropriate behavior 7.Talking in hallway.

It’s 12/3/14, good morning! Distinguish between acids and bases and use indicators (including litmus paper, pH paper, and phenolphthalein) to determine their relative pH objective: discuss the pH scale and acids, the tests, properties and examples. Agenda for today 1. Bell ringer: classify the substances below: is it an acid? A.grease B.Lemon juice C.Water D.Milk 1. Study guide check 2.Competition for celebration 3.Ppt on pH scale and acids

12/3/14 agenda Bell ringer Foldable: 4 pages folded like a book Title: acids and bases Heading: your name, date, and period

It’s 12/4/14, good morning! Distinguish between acids and bases and use indicators (including litmus paper, pH paper, and phenolphthalein) to determine their relative pH objective: discuss the pH scale and acids, the tests, properties and examples. Agenda for today 1. Bell ringer: which of the following are bases? (yes or no) A.Lemon juice B.detergent C.Sugar D.milk E.H 2 O F.H 2 SO 4 1.Homework check (except for 5 th and 7 th pds) 2.Competition for celebration show books, paper, pencil 3.Ppt on pH scale and acids

Acid, base? Indicator? Pg 1 1.Substances can be classified as acids, bases, or neutral based on their pH. 2.Acids and bases are solutions usually with water as the solvent. 3.Indicators are substances that can be used to determine whether a solution is acidic, basic, or neutral.

Reminder: Ornaments for your class? If you are not helping by bringing your book, hw, and materials to class, then you will not participate in the celebration.

Classification of Substances p. 2 A. pH 1.The pH scale is a way to measure how acidic or basic a solution is. 2.The pH range of a solution is between 0 and The pH of pure water is 7. Any solution with a pH of 7 is a neutral solution. It is not an acid or a base. 4.The pH of an acidic solution is less than 7; the lower the number, the more acidic the solution. 5.The pH of a basic solution is greater than 7; the higher the number, the more basic the solution.

B. Acidp Acids can be identified by their sour taste (for example lemons and oranges contain acids); 2.by their reaction with some metals such as zinc, and 3.by their reaction with bases to form a neutral pH solution (for example, vinegar reacting with limestone). C. Base 1.Bases can be identified by their bitter taste (for example, unsweetened cocoa has a bitter taste); 2.by its slippery feel (for example, dish detergent); and 3. by its reaction with acids to form a neutral pH solution (for example, an antacid to soothe an acid stomach). D. Neutral Solution 1.It is neither an acid nor a base. 2.For example, pure water is a neutral solution and has a pH of 7.

pH Indicators p. 4 A. Litmus paper 1.Has a special dye on it that changes colors in the presence of an acid or base. 2.Blue litmus paper turns red in an acid, and stays blue in a base. 3.Red litmus paper turns blue in a base, and stays red in an acid. 4.Both red and blue litmus paper turn violet in a solution that is neutral (neither an acid nor a base). B. Phenolphthalein 1.Is used to test for the presence of a base. 2.It is a colorless chemical that turns magenta (bright pink) in a base, and stays colorless in neutral or acidic solutions. 3. Students need to know the indicator colors (magenta for base or colorless for acids or neutrals) for phenolphthalein. C. pH paper 1.Has a range of colors depending on the pH of the solution. 2.The color of the paper is compared to the chart of the vial to determine the pH.

Bell ringer quiz 12/5/14 In the t-chart below put 3 bullets in each column. acidsbothbases

It’s 12/5/14, good morning! Distinguish between acids and bases and use indicators (including litmus paper, pH paper, and phenolphthalein) to determine their relative pH objective: discuss the pH scale and acids, the tests, properties and examples. Agenda for today 1. Bell ringer: quiz  t-chart, 3 columns 2.Homework check ( for 5 th and 7 th pds) 3.Competition for celebration show books, paper, pencil 4.Question blackjack: Pact coach lessons on pH scale and acids

Divide p. 5 into 6 blocks like below. What is an acid?What is a base? Uses of acidsUses of bases Properties of acidsProperties of bases

What is an acid?  An acid is a solution that has an excess of H. It comes from the Latin word acidus that means "sharp" or "sour".  The more H available, the more acidic the solution.

Uses of Acids  Acetic Acid = Vinegar  Citric Acid = lemons, limes, & oranges. It is in many sour candies such as lemonhead & sour patch.  Ascorbic acid = Vitamin C which your body needs to function.  Sulfuric acid is used in the production of fertilizers, steel, paints, and plastics.  Car batteries

Properties of an Acid  Tastes Sour  Conduct Electricity  Corrosive, which means they break down certain substances. Many acids can corrode fabric, skin,and paper  Some acids react strongly with metals  Turns blue litmus paper red Picture from BBC Revision Bites ases_1.shtml ases_1.shtml

Explanation: Starting in 1983, instead of the solid copper, American pennies are made of zinc coated with a thick layer of copper. Explanation: Starting in 1983, instead of the solid copper, American pennies are made of zinc coated with a thick layer of copper. The zinc metal inside reacts with dilute sulfuric acid to form zinc sulfate and hydrogen (bubbles). The zinc metal inside reacts with dilute sulfuric acid to form zinc sulfate and hydrogen (bubbles). Copper does not react with dilute acids. After the zinc is dissolved (reacted), only the copper shell of the penny is left. Copper does not react with dilute acids. After the zinc is dissolved (reacted), only the copper shell of the penny is left.

What is a base?  A base is a solution that has an excess of OH- (hydroxide) ions.  Another word for base is alkali.  Bases are substances that can accept hydrogen ions

Uses of Bases  Bases give soaps, ammonia, and many other cleaning products the ability to break down substances.  The hydroxide interact strongly with certain substances, such as dirt and grease.  Chalk and oven cleaner are examples of familiar products that contain bases.  Your blood is a weak basic solution.

Properties of a Base  Feel Slippery  Taste Bitter  Corrosive  Can conduct electricity. (Think alkaline batteries.)  Do not react with metals.  Turns red litmus paper blue.

It’s 12/8/14, good morning! Distinguish between acids and bases and use indicators (including litmus paper, pH paper, and phenolphthalein) to determine their relative pH objective: discuss the pH scale and acids, the tests, properties and examples. Agenda for today 1. Bell ringer: how does acid react with each of the following? A. Litmus paper b. phenolphthalein c. pH paper 2.Homework check ( for 5 th and 7 th pds) 3.Competition for celebration show books, paper, pencil 4.Record: Finish first 13 questions on study guide for hw 5.Finish ppt notes in foldable.

It’s 12/9/14, good morning! Distinguish between acids and bases and use indicators (including litmus paper, pH paper, and phenolphthalein) to determine their relative pH objective: discuss the pH scale and acids, the tests, properties and examples. Agenda for today 1. Bell ringer: how does a base react with each of the following? A. Litmus paper b. phenolphthalein c. pH paper 2.Homework check: first 13 questions on study guide 3.Competition for celebration show books, paper, pencil 4.Record 5.Finish ppt notes in foldable.

It’s 12/10/14, good morning! Distinguish between acids and bases and use indicators (including litmus paper, pH paper, and phenolphthalein) to determine their relative pH objective: discuss the pH scale and acids, the tests, properties and examples. Agenda for today 1. Bell ringer: how does a neutral react with each of the following? A. Litmus paper b. phenolphthalein c. pH paper 2. Homework check: first 13 questions on study guide (pd.3-7) 3. Competition for celebration show books, paper, pencil 4. Record: hw– poster on pH scale with samples/labels or pics for each level. Due Tuesday (12/16) 5. Finish ppt notes in foldable.

It’s 12/11/14, good morning! Distinguish between acids and bases and use indicators (including litmus paper, pH paper, and phenolphthalein) to determine their relative pH objective: discuss the pH scale and acids, the tests, properties and examples. Agenda for today 1. Bell ringer: write 3 facts about indicators 2. Homework check: first 13 questions on study guide (pd.3-7) 3. Competition for celebration show books, paper, pencil 4. Record: hw– poster on pH scale with samples/labels or pics for each level. Due Tuesday (12/16) 5. Finish ppt notes in foldable. 6. Go over the hw from study guide. Test tomorrow.

Wednesday afternoon, Thursday morning Using the blue work books and your text books, write the questions on p and answer them. The answers are in section L. Test tomorrow on acids, bases and indicators.

Ornaments for your tree Hw Books5 Assessment Blurt outs Materials5 Manners1 Good notes Clean room Total- mon Tue Wed Thur Fri Total prev week

Back cover: Bell ringer quiz 12/5/14 answers acidsbothbases 1. tastes sour1. Measured on pH scale1. tastes bitter 2. Turns blue litmus red2. Must be in a solution2. Turns red litmus blue 3. Reacts with some metals to form bubbles 3. Usually has water as a solvent 3. slippery 4. Reacts with bases to form salt and water solution/neutralization 4. Ph of 7 is neutral4. Reacts with acids to form salt and water solution/neutralization 5. Ph Ph 8-14 Examples: lemon and orange juice Example: waterExamples: soap and drain cleaner

Acid – Base Reactions p. 6  A reaction between an acid and a base is called neutralization. An acid-base mixture is not as acidic or basic as the individual starting solutions. Salt + H 2 O

Acid – Base reactions p. 7  Each salt listed in this table can be formed by the reaction between an acid and a base.  Acid +base= salt + water

How can we use pH levels to test the “health” of a lake, river, or stream?

p. 8

Vocabulary from pact coach p pH scale– tool that is used to measure how acidic or basic a solution is 2. neutral– pH of 7 and neither acid or base 3. acid– solution with pH of less than 7 4. base-solution with pH of greater than 7 5. indicator– substance that indicates whether something is acidic, neutral, or basic

Pact questions p What is the pH scale used for? To measure how acidic or basic a solution is What are the important points on the pH scale? Describe them = acids, 7=neutral, 8-14= bases Which is the most acidic fruit? Bananas, apples or lemons How do you know ? Because it has the lowest pH Describe 3 properties of acids. (3 sentences) Acids are sour. Acids are corrosive. Acids have a pH of less than 7. Acids react with metals to form bubbles. Acids make blue litmus turn red and red litmus remains red.

5. 5. Describe 3 properties of bases. (3 sentences) Bases are bitter. Bases are slippery. Bases have a pH of greater than 7. Bases make blue litmus remains blue and red litmus turn blue. 6. What are indicators used for? To let you know which solutions are acids, bases, or neutral 7. Describe how litmus paper works. Litmus paper has a special dye that changes color depending on the pH of the solution it is in. 8. How is phenolphthalein different from litmus paper? Phenolphthalein only changes color in a base and remains colorless in a neutral or acidic solution. 9. How is pH paper more accurate? It tells exactly what the pH number is based on color change.

Study guide 1. B 2. C 3. A 4. B 5. C 6. A 7. B 8. D 9. A 10. A 11. B 12. B, c, d 13. B

Name Acid Color pH Range of Color Change Base Color Methyl violetYellow Blue Thymol blueRed Yellow Methyl orangeRed Yellow Bromocresol greenYellow Blue Methyl redRed Yellow ***LitmusRed Blue Bromothymol blueYellow Blue Thymol blueYellow Blue ***PhenolphthaleinColorless Pink ThymolphthaleinColorless Blue Alizarin yellow RYellow Red Indicators--just write the ***ones

pH Scale A change of 1 pH unit represents a tenfold change in the acidity of the solution. For example, if one solution has a pH of 1 and a second solution has a pH of 2, the first solution is not twice as acidic as the second— it is ten times more acidic. p. 10