OPTIONAL CHALLENGE 03 · CHEMISTRY DISCOVERY
Does stirring change the substance, or only how quickly it disappears into the water?
Optional · Try Another Angle
Your new skill: Extend a main-path idea without making the course longer.
Match the names to your parts before you build. New parts appear when you first need them. You can point, say the name or show a grown-up.
A tube holds a small sample. The stand helps keep tubes upright while we compare them.
Look for: Find the narrow containers and matching holes in the stand.
Before using it: Label samples before filling. Keep them open and stable; never seal a fizzing reaction.
Your turn: Place two empty tubes in the stand and label them A and B.
This spoon measures a repeatable amount of powder so our comparisons use the same amount.
Look for: Find the kit's supplied measure and its labelled amount. A level spoon is flat across the top.
Before using it: Use the approved kit measure, not a random kitchen spoon. Powder amount and spoon size must match the kit batch instructions.
Your turn: Show the difference between level and heaped using an empty spoon and a drawing.
A mixing stick moves liquid and powder together so we can compare how mixing affects a result.
Look for: Find the clean stirrer named in the materials.
Before using it: Use a clean stick for each sample, or rinse and dry between samples. Never taste it.
Your turn: Rehearse a gentle stir in an empty container without splashing.
Citric acid is our labelled acidic material. Dissolved in water it can change an indicator's colour and react with baking soda.
Look for: Find the sealed container with its correct label. Similar-looking powders are not interchangeable.
Before using it: Use only the stated amount, goggles and adult supervision. Experiment materials are not food. Keep away from eyes and mouth.
Your turn: Read the label with a grown-up before opening it.
A ruler measures distance. A timer measures elapsed time. Your paper records a prediction and result so you can compare tests.
Look for: Find the cm marks or the timer display and a place to draw or write.
Before using it: Use the same start point and method each time. You can say, point or draw your evidence instead of writing long answers.
Your turn: Choose the mark where the first measurement will begin.
A video demonstration will appear here when it is ready. You can follow the written step now.
Before we build, match these names to the parts in front of you. Test tube and stand. A tube holds a small sample. The stand helps keep tubes upright while we compare them. Find the narrow containers and matching holes in the stand. Label samples before filling. Keep them open and stable; never seal a fizzing reaction. Calibrated kit measuring spoon. This spoon measures a repeatable amount of powder so our comparisons use the same amount. Find the kit's supplied measure and its labelled amount. A level spoon is flat across the top. Use the approved kit measure, not a random kitchen spoon. Powder amount and spoon size must match the kit batch instructions. Mixing stick. A mixing stick moves liquid and powder together so we can compare how mixing affects a result. Find the clean stirrer named in the materials. Use a clean stick for each sample, or rinse and dry between samples. Never taste it. Citric acid. Citric acid is our labelled acidic material. Dissolved in water it can change an indicator's colour and react with baking soda. Find the sealed container with its correct label. Similar-looking powders are not interchangeable. Use only the stated amount, goggles and adult supervision. Experiment materials are not food. Keep away from eyes and mouth. Ruler timer and evidence sheet. A ruler measures distance. A timer measures elapsed time. Your paper records a prediction and result so you can compare tests. Find the cm marks or the timer display and a place to draw or write. Use the same start point and method each time. You can say, point or draw your evidence instead of writing long answers. Pause and point to the part that will do the main job in this mission. If it is missing or looks different, ask a grown-up before building.
WHAT YOU'LL USE
Kit list: match the named parts to your box and its component cards. Home list: gather these before starting; some may also be supplied in your kit. Reuse components between missions. Stop and ask a grown-up if an essential part or label is missing.
BEFORE YOU BUILD
Keep tubes upright. Do not shake. Grown-up move: Start the timer and check only one variable changes.
YOUR REWARD
PREDICT BEFORE YOU BEGIN
What do you think will happen? Say it, point to it or draw it. Then test your idea.
YOUR CHALLENGE
SKILL BRIDGE
Use the exact samples listed in What you need. Match container size and keep the stirring method the same.
BUILD PATH
STEP 1 OF 6
Label the tubes STIR and WAIT; add 10 mL water to each.
A video demonstration will appear here when it is ready. You can follow the written step now.
Label the tubes STIR and WAIT; add 10 mL water to each.
WHAT'S REALLY HAPPENING?
Stirring brings fresh water to the solid and carries dissolved particles away. It changes the speed of dissolving, not the substance itself.
CLEAN, RESET AND STORE
Ask your grown-up to follow the supplied disposal instructions. Keep glitter and solid pieces out of drains. Clean the tray, wash your hands and store labelled materials away from younger children.