🌋 Baking soda and the fizz: the whole packet

🌋 Baking soda and the fizz · 3rd–8th grade · 1 day of testing · free · 45 minutes a sitting

My days, if the fair is 14 days away

Count back from your fair day and write in each date. Fewer days than this? The jobs share days, in this order; nothing is skipped.

Dates from my teacher

• My question is due
• Testing starts
• My results table and graph are due
• My board is due

In this packet

1. 🗓️ My project plan
2. 💭 My hypothesis
3. 🧺 Change, measure, keep the same
4. 🪜 My steps
5. 📊 My results
6. 📓 My logbook
7. ✅ My conclusion
8. ✂️ Board titles to cut out
9. 🏅 The judge's questions and my certificate

If I change how much baking soda goes in, then how high the foam climbs up the cup will ________________, because _____________________________________________

What I think will happen, in my own words:

3 levels × 3 tries at each = 9 tries in all. If anything you keep the same changes, you won't know which change made the difference.

What I need

• 🧂 Baking soda
• 🍶 White vinegar: about 3 cups in all
• 🥛 Clear plastic cups, all the same size: 1 tall one
• 🥛 A measuring cup
• 🥄 Measuring spoons
• 🍽️ A baking tray or big plate
• 🧽 A sponge or cloth, for wiping up
• 📏 A ruler
• 🩹 Tape

Be safe: 🥽 Goggles on · 🧽 A bit messy

1. Put your goggles on and stand a tall clear cup on a tray.
2. Tape a ruler up the side of the cup, with 0 at the bottom.
3. Put 1 teaspoon of baking soda in the cup.
4. Pour in a quarter cup of vinegar all at once.
5. Watch the ruler and write down the highest the foam reaches.
6. Rinse the cup, dry it, and do it two more times.
7. Do three tries with 2 teaspoons and three with 3 teaspoons.
8. Draw a line graph of baking soda against foam height.

Write each number in your results table the moment you measure it.

I changed: Baking soda   I measured: how high the foam climbs up the cup (cm)

MY GRAPH (a line graph: baking soda along the bottom, cm up the side)

What I noticed: ______________________________________________

Write something every day you work on it, even the days you only gather things. More days? The three-page logbook prints from peabody.kids/science-fair/templates/logbook.

My hypothesis was ☐ right ☐ partly right ☐ not right.

I know because my numbers show:

What surprised me, or what might have gone wrong (7th and up):

Next time I would test:

Idea: Change a second thing: keep 2 teaspoons and try a quarter, a half and a whole cup of vinegar, then find which one runs out first.

1. What made you want to ask this question? Say something like: I wanted to know: does more baking soda make a bigger fizz?
2. What did you think would happen, and why? Say something like: I thought changing how much baking soda goes in would change how high the foam climbs up the cup, and I wrote down why.
3. What did you change, and what did you measure? Say something like: I changed how much baking soda goes in (1 teaspoon, 2 teaspoons, 3 teaspoons) and measured how high the foam climbs up the cup in cm.
4. What did you keep the same, and why does that matter? Say something like: I kept the same amount of vinegar and the same cup the same, so only how much baking soda goes in was different.
5. How many times did you test it? Say something like: 3 times at each of my 3 levels, and I found the middle number.
6. What did you find out? Show me in your numbers. Say something like: Look at my table: 1 teaspoon and 3 teaspoons gave different numbers, and here's the pattern.
7. Was your hypothesis right? How do you know? Say something like: My numbers show whether I was right, partly right or not, and I can show you where.
8. Did anything go wrong, or surprise you? Say something like: One try was odd, so I did it again and wrote it in my logbook.
9. If you did it again, what would you change or test next? Say something like: I'd change a second thing: keep 2 teaspoons and try a quarter, a half and a whole cup of vinegar, then find which one runs out first.