Untitled Presentation

​Chemical Interactions Lab

Chemical Ice-Cream Experiment (with Flavor Options!)

🧪 How It Works (Simple Science)

Salt + ice break some of the molecular bonds in water → lower freezing point → liquid cream freezes faster
→ Phase change: liquid → solid


Concept: Ionic salts disrupt water bonding → freezing point depression

Base Ingredients	Optional Flavor Add-Ins
1 cup half & half or heavy cream	1–2 tsp vanilla extract
2 tbsp sugar	1 tsp peppermint extract + a drop of green coloring
1 tsp vanilla (if not using another flavor)	Chocolate syrup or cocoa powder
Ice + ⅓ cup rock salt (or table salt)	Smushed strawberries or fruit syrup
2 zip-top bags (quart + gallon size)	Sprinkles, mini chocolate chips

Step-by-Step Instructions

1. Add cream + sugar + flavor to small quart bag

2. Press out air and seal tight

3. Fill gallon bag halfway with ice + salt

4. Put small bag inside the big bag + seal

5. Shake for 5–7 minutes (wear gloves or a towel — it gets cold!)

6. Remove inner bag, quick rinse to remove salt water

7. Scoop and enjoy!

Open Ended

• Why did the salted ice get colder than regular ice?

• What state change did the cream go through?

• How did adding flavoring or color change the final product?

Acid + Base Balloon Inflation

Concept: Chemical reaction releases a gas (CO₂)
Materials: Vinegar, baking soda, balloon, empty water bottle, funnel

How to Do It:

1. Fill the bottle halfway with vinegar

2. Use a funnel to add baking soda into the balloon

3. Carefully attach balloon to the bottle — don’t spill yet!

4. Lift balloon so baking soda drops in… watch the balloon inflate!

What’s Happening?
Acid (vinegar) + base (baking soda) → Carbon dioxide gas is produced → fills balloon

In this experiment:

• Vinegar = Acetic Acid

• Baking Soda = Sodium Bicarbonate (Base)

When mixed, they react to form:

• Carbon dioxide gas (CO₂)

• Water (H₂O)

• Sodium acetate (a type of salt)

The CO₂ gas expands and fills the balloon, giving us visual evidence that a chemical reaction took place.

Observations

• Bubbling/fizzing reaction inside the bottle
  → Gas is being produced

• Balloon expands
  → Gas is taking up space as it forms

• Bottle may get cooler
  → Reaction is endothermic (absorbs heat)

Real-World Connections

• Volcano science models use the same reaction

• CO₂ production in bread (baking soda or baking powder)

• Acid–base chemistry used in cleaning products

• Fire extinguishers that release CO₂

Open Ended

• What evidence shows that a chemical reaction occurred in this experiment?

• Explain why the balloon inflated using your knowledge of gas behavior.

• How do you know a new substance was formed?