Class Demo 1: Carbon Dioxide Extinguishes a Flame

• narrow-necked bottle with a narrow opening, such as a glass soda bottle
• vinegar
• baking soda
• matches
• candle
• plastic drinking straw
• Hot Stuff! Activity 1 Worksheets, one per student; use this worksheet for Class Demo 1, 2, 3, and Student Activity 1

Class Demo 2: Creating and Testing for Carbon Dioxide

• narrow-necked bottle with a narrow opening, such as a glass soda bottle
• 50 ml vinegar
• 45 grams baking soda
• small, round balloon
• plastic drinking straw
• 50 ml BTB; solution = 6 drops per 1/3 cup water; BTB is bromothymol blue (BTB), a dye used as an acid-base indicator solution; available at chemistry equipment stores, well-equipped hardware stores and online chemistry equipment supply companies such as Fischer Scientific International
• clear beaker, large enough to hold 50 ml of BTB solution
• Hot Stuff! Activity 1 Worksheets, one per student; use this worksheet for Class Demo 1, 2, 3, and Student Activity 1

Student Activity 1: Testing for Carbon Dioxide from Our Own Breath

Each student needs:

• small, round balloon
• plastic drinking straw
• small cup of ~50 ml of BTB solution; solution = 6 drops per 1/3 cup water; paper Dixie cups or small beakers are suitable
• Hot Stuff! Activity 1 Worksheet, use this worksheet for Class Demo 1, 2, 3, and Student Activity 1

Class Demo 3: Testing Ice

• 2 medium-size beakers, each half full of BTB solution; solution = 6 drops per 1/3 cup water
• 1-2 small pieces of ice (cubes)
• 1-2 small pieces of dry ice
• Hot Stuff! Activity 1 Worksheets, one per student; use this worksheet for Class Demo 1, 2, 3, and Student Activity 1

Student Activity 2: Team Investigations

Each group needs:

• Hot Stuff! Activity 2 Investigation Worksheet and Instructions; provide each group with the specific instruction sheet for the investigation that the group is conducting
• masking tape and pen
• graph paper, 1 sheet per group
• supplies for the specific investigation the group is conducting (see below).
• Investigation #1 supplies:

• 2 identical, large plastic jars
• 2 outdoor thermometers (must fit in jar)
• 25 g baking soda
• 1 cup vinegar
• plastic wrap (2 large squares to fit over jar openings)
• 2 rubber bands

• Investigation #2 supplies:

• 2 identical, large jars
• 2 outdoor thermometers (must fit in jar, below rim)
• hot water
• hot mitt
• plastic wrap (1 large square to fit over jar opening)
• rubber band

• Investigation #3 supplies:

• 2 identical, large jars
• 2 outdoor thermometers (must fit in jar, below rim)
• cold water chilled with ice cubes
• plastic wrap (1 large square to fit over jar opening)
• rubber band

• Investigation #4 supplies:

• 2 identical, large jars
• 2 outdoor thermometers (must fit in jar, below rim)
• 2 cups of garden soil
• plastic wrap (1 large square to fit over jar opening)
• rubber band