How fast something dissolves might seem like a simple question — until you try to test it.
The Dissolving Race Challenge invites learners to investigate how different materials behave when added to water. They observe. They time. They repeat. And most importantly, they begin to notice.
“Why did sugar dissolve faster than salt?”
“Does stirring make a difference?”
“What if the water was colder?”
These questions are the start of hypothesis-driven enquiry.
Where Curiosity Meets Method
Learners are invited to:
- Compare sugar, salt, flour, or other common powders.
- Keep key variables consistent (e.g. temperature, amount, container).
- Record the time it takes for each to dissolve.
- Reflect on what they expected, and what actually happened.
It’s not a race to finish first — it’s a race to understand why.
Structured for Scientific Thinking
Learners are prompted to:
- Form predictions.
- Design fair tests with control variables.
- Record observations precisely.
- Analyse results and propose improvements.
They’re guided to think like scientists — making choices, reviewing outcomes, and planning better tests next time.
No Special Equipment Required
Only basic items are needed:
- Measuring spoons
- Water
- A timer
- Powders like sugar, salt, flour, or baking soda
This makes it perfect for:
- Science lessons at school or home
- Science club
- Transition days
- STEM weeks
- Independent science projects
Educators can tailor the test to explore water temperature, stirring speed, or particle size — opening the door to extended investigations.
Links to Curriculum
The challenge naturally supports:
- Solubility and states of matter.
- Properties and changes of materials.
- Scientific enquiry, particularly variables and data handling.
- Time measurement and accuracy.
It also encourages evaluative thinking — asking learners not just what happened, but how well they tested it.
Support and Resources
An editable bundle is available with:
- A presentation introducing the challenge.
- A scaffolded method-writing sheet.
- Results table and leaderboard to encourage precision and engagement.
- A reflective evaluation tool with structured prompts.
- A certificate recognising careful scientific work.
👉 Buy the Dissolving Race STEM Challenge Kit here
👉 View the full STEM challenge collection
Some investigations explode. This one fades away — but leaves behind a deeper understanding of testing, timing, and how to trust the evidence you observe.
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