In the IGCSE Chemistry syllabus you must be able to name the right piece of equipment for measuring time, temperature, mass and volume. Below are the key apparatus, simple analogies to everyday objects, and quick exam‑tips to help you remember them.
Think of a stopwatch as the digital timer on your phone. It counts seconds (and fractions of seconds) from the moment you press start until you press stop.
| Feature | Why It Matters |
|---|---|
| Digital display | Precise to 0.1 s – useful for reaction kinetics. |
| Reset button | Start each trial fresh. |
Exam tip: When asked “How would you measure the time of a reaction?”, answer: “Use a stopwatch to record the time from the start of the reaction to the point of completion.” Mention the 0.1 s precision if the question asks for accuracy.
A thermometer is like a thermometer in a soup pot – it tells you how hot or cold something is. In the lab we use mercury or alcohol thermometers, or digital probes.
| Type | Best Use |
|---|---|
| Mercury | High‑temperature reactions (up to 350 °C). |
| Alcohol | Low‑temperature (< 100 °C) measurements. |
| Digital probe | Fast, accurate readings for solutions. |
Exam tip: For “What instrument would you use to measure the temperature of a boiling solution?”, reply: “A digital thermometer or a mercury thermometer if the temperature is above 100 °C.” Note the safety warning about mercury.
Think of a balance as a kitchen scale but with far higher precision. We use analytical balances for milligram accuracy and simple balances for gram‑level measurements.
| Balance Type | Precision |
|---|---|
| Analytical | ±0.01 g (10 mg) |
| Simple | ±0.1 g |
Exam tip: When asked “How would you determine the mass of a solid sample?”, answer: “Place the sample on an analytical balance, record the mass to the nearest 0.01 g, and subtract the mass of the container if used.” Mention the importance of zeroing (tare) the balance.
These are your graduated measuring tools for liquids. Each has a specific accuracy level and best use case.
| Apparatus | Accuracy | Typical Volume |
|---|---|---|
| Burette | ±0.01 mL | 25–50 mL |
| Volumetric pipette | ±0.01 mL | 1–100 mL |
| Measuring cylinder | ±0.5 mL | 10–100 mL |
Exam tip: For “Which apparatus would you use to measure 25 mL of a reagent accurately?”, reply: “A burette or a 25 mL volumetric pipette – both give ±0.01 mL precision.” If the question asks for a quick measurement, suggest a measuring cylinder but note its lower accuracy.
A gas syringe is like a medical syringe but for gases. It lets you draw or dispense a precise volume of gas, usually up to 10 mL, with an accuracy of ±0.01 mL.
| Feature | Use Case |
|---|---|
| Graduated barrel | Measure gas volume accurately. |
| Sealed needle | Prevent gas loss. |
Exam tip: When asked “How would you measure the volume of a gas produced in a reaction?”, reply: “Use a gas syringe to collect the gas and read the volume at the meniscus, ensuring the syringe is at the same temperature as the gas.” Mention the importance of zeroing the syringe before use.
Quick Recap: