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Learn: Temperature Changes and How to Measure Them Safely
AQA GCSE Chemistry 8462 specification
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Welcome!Great to see you back! You've already explored exothermic and endothermic reactions, reaction profiles, activation energy, and bond energy calculations. Today, we'll learn about how to measure temperature changes safely during chemical reactions. Let's get started!
Why Measure Temperature Changes?Measuring temperature changes helps us understand whether a reaction is exothermicendothermic (absorbs heat). It's an important way to study energy transfers in chemical reactions.
Steps to Measure Temperature Changes SafelyTo measure temperature changes, we use equipment like a thermometer and insulated containers. It's essential to handle chemicals safely and minimise heat loss to the surroundings for accurate results.
Quick check: Why do we use insulated containers when measuring temperature changes?
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Key Equipment for Temperature Change ExperimentsWe often use a thermometer, polystyrene cup, and a lid to reduce heat loss. A measuring cylinder or pipette is used to add precise amounts of liquids.
A {{blank0}} cup is used during temperature change experiments because it is a good {{blank1}}.
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How to Record Temperature ChangesUse a thermometer to measure the start temperature of the reactants. After the reaction occurs, record the maximum or minimum temperature reached. The difference shows the temperature change.
Safety PrecautionsWear gloves and goggles to protect yourself from spills or splashes. Be cautious when handling hot substances, and avoid touching the thermometer with your hands during measurements.
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Which safety precaution is essential when measuring temperature changes?
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Review Time!Well done! You've learned how to measure temperature changes safely, including the key equipment and safety precautions. Let's review some key concepts.
Which of the following are correct about measuring temperature changes? (Select all that apply)
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The difference between the starting and final temperatures is the {{blank0}} change.
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Match the items on the left with their correct pairs on the right
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Congratulations!You've completed the lesson on measuring temperature changes and how to do it safely. Great work today!
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