Week of 12/1/14

It’s 12/1/14, good morning!7-5.6-- 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 guide5. Ppt on pH scale and acids

Pretest for acids and bases

1.2. 3.

13.

NameDateperiod

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. Hwornament– B. 100% hw 5 ornaments– C. 100% passing assessments 5 ornaments2. 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 youc. Good note from principal or sub

How do we lose ornaments?

1. blurting out2. No books3. No materials4. Not paying attention5. Leaving trash6. Inappropriate behavior7. Talking in hallway.

It’s 12/3/14, good morning!7-5.6-- 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. greaseB. Lemon juiceC. WaterD. Milk2. Study guide check 3. Competition for celebration 4. 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!7-5.6-- 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 today1. Bell ringer: which of the following are bases? (yes or no) A. Lemon juiceB. detergentC. SugarD. milkE. H2OF. H2SO4

2. Homework check (except for 5th and 7th pds)3. Competition for celebration show books, paper, pencil4. 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. pH1. 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 14.3. 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. Acid p. 31. 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. Base4. Bases can be identified by their bitter taste (for example,

unsweetened cocoa has a bitter taste);5. by its slippery feel (for example, dish detergent); and6. by its reaction with acids to form a neutral pH solution (for

example, an antacid to soothe an acid stomach).D. Neutral Solution1. 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 paper1. 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 neutra l (neither an acid nor a base).B. Phenolphthalein1. 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 paper1. 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 12/5/14In the t-chart below put 3 bullets in each column. acids both bases

• 1. 1. 1.

2. 2. 2.

3. 3. 3.

It’s 12/5/14, good morning!7-5.6-- 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 5th and 7th pds)3.Competition for celebration show books, paper,

pencil4.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 acids Uses of bases

Properties of acids Properties 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 http://www.bbc.co.uk/schools/ks3bitesize/science/chemistry/acids_bases_1.shtml

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). 

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!7-5.6-- 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 5th and 7th pds)3. Competition for celebration show books, paper, pencil4. Record: Finish first 13 questions on study guide for hw5. Finish ppt notes in foldable.

It’s 12/9/14, good morning!7-5.6-- 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, pencil4. Record5. Finish ppt notes in foldable.

It’s 12/10/14, good morning!7-5.6-- 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 today1. 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, pencil4. 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!7-5.6-- 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 today1. Bell ringer: write 3 facts about indicators2. Homework check: first 13 questions on study guide (pd.3-7)3. Competition for celebration show books, paper, pencil4. 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. 40-43 and answer them. The answers are in section L.

• Test tomorrow on acids, bases and indicators.

Ornaments for your tree1 3 4 5 7

Hw

Books 5

Assessment

Blurt outs

Materials 5

Manners 1

Good notes

Clean room

Total- mon 13 17 14 12 15

Tue

Wed

Thur

Fri

Total prev week

76 63 54 50 83

Back cover: Bell ringer quiz 12/5/14 answers

acids both bases1. tastes sour 1. Measured on pH scale 1. tastes bitter

2. Turns blue litmus red 2. Must be in a solution 2. 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 neutral 4. Reacts with acids to form salt and water solution/neutralization

5. Ph 0-6.9 5. Ph 8-14

Examples: lemon and orange juice

Example: water Examples: 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 + H2O

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. 91. pH scale– tool that is used to

measure how acidic or basic a solution is2. neutral– pH of 7 and neither acid or base3. acid– solution with pH of less than 74. base-solution with pH of greater than 75. indicator– substance that indicates whether something is acidic, neutral, or basic

Pact questions p. 101. What is the pH scale used for? To

measure how acidic or basic a solution is.

2. What are the important points on the pH scale? Describe them. 0-6.9= acids, 7=neutral, 8-14= bases

3. Which is the most acidic fruit? Bananas, apples or lemons How do you know ? Because it has the lowest pH.

4. 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. 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 neutral7. 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. B2. C3. A4. B5. C6. A7. B

8. D9. A10. A11. B12. B, c, d13. B

Name Acid Color

pH Range ofColor Change

Base Color

Methyl violet Yellow 0.0 - 1.6 Blue

Thymol blue Red 1.2 - 2.8 Yellow

Methyl orange Red 3.2 - 4.4 Yellow

Bromocresol green Yellow 3.8 - 5.4 Blue

Methyl red Red 4.8 - 6.0 Yellow

***Litmus Red 5.0 - 8.0 Blue

Bromothymol blue Yellow 6.0 - 7.6 Blue

Thymol blue Yellow 8.0 - 9.6 Blue

***Phenolphthalein Colorless 8.2 - 10.0 Pink

Thymolphthalein Colorless 9.4 - 10.6 Blue

Alizarin yellow R Yellow 10.1 - 12.0 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