Name: ____________________________________ Date: ______________ Period: ______
Station: ______ My role: ______________________
Print for every student. Bring it both days. Day 1 is pages 1 to 3, Day 2 is pages 4 and 5.
DAY 1
Part 1. How leavening works
Write it in four sentences, in your own words.
- ___________________________________________________________________________
- ___________________________________________________________________________
- ___________________________________________________________________________
- ___________________________________________________________________________
Which one needs an acid to work? Circle: baking powder / baking soda
Where does the acid come from in a real recipe? Name three sources:
- ____________________ 2. ____________________ 3. ____________________
Part 2. The four-cup fizz test
| Cup | What is in it | What happened (none, a little, a lot) |
|---|---|---|
| 1 | Baking soda + water | |
| 2 | Baking soda + vinegar | |
| 3 | Baking powder + water | |
| 4 | Baking powder + vinegar |
The rule, in one sentence:
Baking soda needs ______________________, and baking powder does not because
Answer: _____________________________________________________________________________
Part 3. The experiment setup
The four batches
| Batch | Leavening treatment | What I predict |
|---|---|---|
| A (control) | 1 tsp baking powder | |
| B | none at all | |
| C | 2 tsp baking powder | |
| D | 1 tsp baking soda, no acid |
Variables
Independent variable (the one thing we change on purpose):
Line 1: _____________________________________________________________________________
Dependent variable (what we measure to see the result). Name all three. Hint: look at the columns in the Part 5 data table.
- ____________________ 2. ____________________ 3. ____________________
Constants (everything we keep exactly the same). List at least four. Try for eight:
| 1. | 5. |
| 2. | 6. |
| 3. | 7. |
| 4. | 8. |
Why do we need Batch A at all, if we already know a normal muffin rises?
Answer: _____________________________________________________________________________
Line 2: _____________________________________________________________________________
Part 4. My hypothesis and prediction
My hypothesis (my best guess, one sentence, in the form "if we change ___, then ___"):
Line 1: _____________________________________________________________________________
Line 2: _____________________________________________________________________________
My prediction: rank the four batches by how high I think they will rise.
Highest ______ second ______ third ______ lowest ______
Batch D prediction: what will it taste like and why?
Answer: _____________________________________________________________________________
Day 1 exit card
The one thing we are changing is ______________________.
Batch ______ will rise the highest because ___________________________________.
DAY 2
Part 5. Data
Use the ruler. Measure the batter height in the liner before baking. Measure the muffin height after baking.
| Batch | Height BEFORE baking | Height AFTER baking | How much it rose | Crumb (none, few, or many holes) | Taste |
|---|---|---|---|---|---|
| A (control) | |||||
| B (no leavening) | |||||
| C (double) | |||||
| D (soda, no acid) |
Time the tin went in: ______ Time it came out: ______ Oven temperature: ______
Actual ranking by height
Highest ______ second ______ third ______ lowest ______
Compare to your prediction
| Batch | I predicted | What actually happened | Same or different? |
|---|---|---|---|
| A | |||
| B | |||
| C | |||
| D |
Part 6. Conclusion
Fill in all four parts.
The data showed ________________________________________________________
Line 2: _____________________________________________________________________________
My hypothesis was (circle one) supported / not supported / partly supported, because
Answer: _____________________________________________________________________________
My evidence is _________________________________________________________
Line 3: _____________________________________________________________________________
One thing that could have gone wrong with our test is __________________
Line 5: _____________________________________________________________________________
One sentence our station can read out loud at the station check:
Answer: _____________________________________________________________________________
Station check
| Line | Done? |
|---|---|
| Oven off, tin on the trivet, nothing hot left out | |
| All four bowls washed, dried, and put away per the drawer map | |
| Measuring cups and spoons washed and put away | |
| Counters wiped and sanitized | |
| Sink empty and rinsed | |
| Floor swept, trash out | |
| Leavening jars returned to the teacher's table |
Teacher signature: ______________________
Grade 8 stretch: Batch E
Batch E: 1 tsp baking soda PLUS 1 tsp white vinegar. Everything else the same.
| Batch E | Before | After | How much it rose | Crumb | Taste |
|---|---|---|---|---|---|
Does Batch E behave more like Batch A or more like Batch D? ______
What does that prove? ___________________________________________________
Line 3: _____________________________________________________________________________
Name one confounding variable in our own test. (A confounding variable is something we did not control that could have changed the result.) Then say how you would control it next time.
The variable: ________________________________________________________________
How to control it: ___________________________________________________________
The teacher key for this handout is behind the teacher sign in. Teacher key