Science 104- Monday October 6 th Schedule • Starter • Attendance •Return graded assignments •Lesson on pH •Memory Questions •Discussion on pH lab Learning Intentions •To relate acids and bases to the pH scale •To understand that substances in nature have different pH values
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Science 104- Monday October 6 th Schedule Starter Attendance Return graded assignments Lesson on pH Memory Questions Discussion on pH lab Schedule Starter.
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Science 104- Monday October 6th
Schedule• Starter• Attendance•Return graded assignments•Lesson on pH•Memory Questions •Discussion on pH lab
Learning Intentions•To relate acids and bases to the pH scale •To understand that substances in nature have different pH values
Learning Curve
Classroom Routines
• Starters• Vocabulary Quizzes• Class website• Missing Class• Participation
StarterCopy down the following definitions Acid: A substance with a pH of less than 7. Vinegar and lemons are acidic substances with a sour taste. (page 467)Base: A substance with a pH of more than 7. Baking soda is an example of a base with a bitter taste. (page 467)pH: A scale that classifies substances according to their acidity and alkalinity. (page 190)
Word Association
When I say a word write down the first three words that come to mind.
READYSET
WORD: FIREREADY
SET WORD: ACIDS
Acids and Bases
• Acids and bases are two special kinds of chemicals
• Almost all liquids are either acids or bases to some degree.
• Whether a liquid is an acid or a base depends on the ions that are present
• When acids and bases mix they neutralize (cancel) each other
In Our Bodies
• Stomach releases hydrochloric acid to help breakdown food
• Heartburn is when the acid comes up the esophagus
• Stomach is protected by thick lining
• Food exiting the stomach is mixed with strong bases
In Nature
• Bee stings- Injects you with an acid- Causes pain and swelling
• Poison Ivy- Produce a basic substance- Severe irritation occurs
What should you do?
Page 188 Textbook
Apply a basic substance like baking soda
Apply an acidic substance like
vinegar or lemon
In Food
Acids - Sour Taste- Used for flavouring
Bases- Bitter Taste
In The Environment
Acid Rain- Damages buildings- Effects plants- Can change the
acidity of lakes http://www.ecokids.ca/PUB/eco_info/topics/frogs/acid_rain/play_acidlake.cfm