Observation or Inference
You see water boiling at 100°C. Is this an observation or inference?
✅ Observation
Used to measure liquid volume accurately.
✅ Measuring cylinder
Why must long hair be tied back?
✅ To prevent it catching fire or touching chemicals.
What colour is the safety flame?
✅ Yellow
What unit is used for liquid volume?
✅ mL (millilitres)
“The plant grew taller because it had more sunlight.”
✅ Inference
Used to hold chemicals while heating.
✅ Beaker (accept conical flask)
Which sense should NEVER be used directly in the lab?
✅ Taste
Which flame is hotter: yellow or blue?
✅ Blue
What part of the water do you read when measuring volume?
✅ Bottom of the meniscus
Name ONE thing observations must NOT include.
✅ Opinions / guesses
Used to protect your eyes.
✅ Safety goggles
What should you do if you smell gas?
✅ Tell teacher / turn gas off immediately.
What controls the air entering the burner?
✅ Collar / air hole
Tool used to measure temperature.
✅ Thermometer
Which uses your senses: observation or inference?
✅ Observation
Used to transfer liquids into narrow containers.
✅ Funnel
Is running in the lab safe or unsafe?
Unsafe
When heating a test tube, where should it point?
✅ Away from people
Why do scientists measure instead of guessing?
✅ For accuracy / reliable data
Why can inferences sometimes be wrong?
✅ They are explanations based on thinking, not direct evidence.
Holds test tubes upright.
✅ Test tube rack
Name ONE item you must wear during experiments.
✅ Safety glasses / goggles
What must be done FIRST before lighting a Bunsen burner?
✅ Put on goggles / prepare match before gas (accept either safety prep answer)
Why is the yellow flame called the safety flame even though it can still burn you?
✅ Because it is easier to see and less hot than the blue flame.