1 19 what acids & bases

Launch: 1/19   Grab your binder and immediately take a seat!

  Place launch paper on your desk.

  Friday’s Quiz Data:

  Today’s Objective: I can describe the properties of acids and bases.

90%

Launch: 1/19   Grab your binder and immediately take a seat!

  Place launch paper on your desk.

  Friday’s Quiz Data:

  Today’s Objective: I can describe the properties of acids and bases.

82%

Launch: 1/19   Grab your binder and immediately take a seat!

  Place launch paper on your desk.

  Friday’s Quiz Data:

  Today’s Objective: I can describe the properties of acids and bases.

80%

Launch: 1/19   Grab your binder and immediately take a seat!

  Place launch paper on your desk.

  Friday’s Quiz Data:

  Today’s Objective: I can describe the properties of acids and bases.

87%

Launch: 1/19   Partner norms

  10 minutes to fill out sheet

Announcements   Second-half of Unit #6: Acids & Bases

  The semester ends on Friday!   Progress report @ end of class

  Missing assignments due Thursday 1/21

  Lab make-ups on Wed during tutoring

  Friday’s quiz   Tomorrow’s lab

  Unit #6 exam moved to Thursday 1/28

January Calendar

What are acids & bases?

Mr. Heffner 1/19/10

What is a solution?   A solution is…

  a homogeneous mixture made up of a solute and a solvent   Example: sugar and water

  Non-example: sand and water

What are acids and bases?   Solutions can be classified as…

Acids   pH < 7   taste sour

  Ex: lemon juice   burn skin   turn litmus paper red

Bases   pH > 7   taste bitter

  Ex: soap   feel slippery   turn litmus paper blue

“pH scale”

Examples

  Is it an acid, a base, or neutral solution?   Vinegar   Water

  Baking soda   Drain cleaner   HCl (hydrochloric acid)

Foldable   Use colored pencils to create a book about acids/

bases   Front page: Title, name, block, date   Acids

  Page 1: Properties

  Page 2: Examples

  Bases   Page 3: Properties

  Page 4: Examples

  Page 5 & 6: labeled pH scale

Practice Questions   Practice question worksheet

Exit Slip

1. Which of the following is true about acids? a.  they taste bitter b.  they turn litmus paper blue c.  they have a pH of greater than 7

d.  they taste sour and turn litmus paper red

Exit Slip 2.  Unlike acids, bases

a.  feel slippery and have pH values greater than 7 b.  turn litmus paper red

c.  taste sour and turn litmus paper blue d.  are always dangerous because they can burn skin

Exit Slip 3.  Baking soda is an example of an

a.  acid because it turns litmus paper red b.  base because it has a pH of about 8.5

c.  acid because it turns litmus paper blue d.  base because it tastes similar to lemons

Exit Slip 4.  Which of the following solution is the most basic?

a.  vinegar b.  milk

c.  soap d.  drain cleaner

Exit Slip 5.  Which of the following solutions would have the

highest acidity? a.  pH 11 b.  pH 9 c.  pH 5

d.  pH 2

Homework   Finish practice questions