Download Chapter 6 - Activity 2

ACTIVE CHEMISTRY – COOL CHEMISTRY SHOW– CHAPTER 6
Key Concept: When a chemical change occurs, new substances are produced by recombining the atoms in a former
substance.
ACTIVITY 2 – MORE CHEMICAL CHANGES
Assessment Objectives:
 Evidence can be used to determine whether a chemical change has occurred (for example: color change,
generation of a gas, formation of a precipitate, energy transfer, use of indicators). (2.3.a)
1. Double replacement reactions in well plates:
Materials
Amount per class (8 groups)
24 well plate
8
0.1 M Sodium hydroxide
100 mL
0.1 M Copper (II) sulfate
100 mL
0.1 M hydrochloric acid
100 mL
0.1 M iron (III) nitrate
50 mL
0.1 M barium nitrate
50 mL
0.1 M sodium hydrogen carbonate
50 mL
0.1 M potassium iodide
50 mL
0.1 M silver nitrate
50 mL
Clear plastic dropper bottles
48
Brown glass dropper bottles
8
Prep hint:
 The solutions above will be used again in later experiments. It saves time to label and fill the dropper bottles
now as they can be used in future activities.
 The lab can also be done as a microscale lab, eliminating the need to collect the waste and dispose of it later.
Chemical disposal:
 Collect contents of 24 well plates in tray and then store in labeled waste container. Contact Joni Rix for disposal
when container is full.
2. Ziploc bag experiment
Materials
Amount per group
Quart size resealable bag
1
Calcium chloride
1 small scoop
Baking soda
1 small scoop
Phenol red
10 mL
Scoopula
2
50 mL graduated cylinder
1
Chemical Disposal:
Contents of the resealable bag can be rinsed down the sink with an excess of water.
3. Limewater experiment
Materials
Amount per group
250 mL erlynmeyer flask
1
Calcium hydroxide solution (limewater)
100 mL
Soda straw
1
Chemical disposal:
 Limewater – collect in a labeled waste container and contact DPS for collection when container is full.
Alternately, the solution can be diluted to a final concentration of 1M, neutralized to a pH of 5-9 by the addition
of 3M hydrochloric acid, and then flushed down the drain with a 20-fold excess of water.
Teacher Notes
Materials/Set up notes:
Group size: _______ students per group
because
Estimated time in class for this activity
1) Double replacement reactions
2) Ziploc bag experiment
3) Limewater experiment
Essential Understanding from the activity:
Homework:
Embedded assessments:
Investigate
Checking Up
Chem To Go
#3a-g, 4c, 5a
#2-6
#1-3
Key Vocabulary:
indicator
chemical test