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In Course: GCSE Combined Science (AQA Trilogy): Chemistry

AQA GCSE Combined Science: Energy Changes

Focuses on energy changes in chemical reactions. This deck defines and provides examples of exothermic and endothermic reactions. It introduces reaction profiles, explaining how to interpret and label the activation energy and the overall energy change (enthalpy change) for both types of reaction. This deck also covers Required Practical 3 (Investigating Temperature Changes in Reacting Solutions).

A dramatic wide-angle photograph captures a dynamic transformation: on one side, brilliant orange and red flames burst forth, casting a warm, intense glow, while on the other, intricate frost patterns rapidly crystalize across a dark surface, emanating a cold, ethereal mist. The scene emphasizes the powerful exchange of energy.

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Deck Contents

39 Cards
Lesson#1
In this deck, we'll explore energy changes in chemical reactions. You'll learn about two key types of reaction: exothermic and endothermic. We'll also look at how to represent these changes using reaction profile diagrams, and investigate the required practical for measuring temperature changes in solutions.
Lesson#2
All chemical reactions involve an energy change. Some reactions release energy into their surroundings, while others take energy in. The first type we'll look at are reactions that release energy. These are called exothermic reactions. Because they transfer energy to the surroundings, they cause the temperature of the surroundings to increase.
Quiz#3
What is the term for a chemical reaction that transfers energy to the surroundings, causing the temperature to increase?

exothermic

Lesson#4
You encounter exothermic reactions every day. Combustion, which is just burning, is a classic example. When you burn a fuel like wood or gas, it releases a large amount of heat and light energy. Other examples include many oxidation reactions, like the rusting of iron, and the neutralisation reactions between acids and alkalis.
Quiz#5
Is the combustion of a fuel an example of an exothermic or endothermic reaction?

exothermic

Quiz#6
In chemistry, are neutralisation reactions between acids and alkalis generally exothermic or endothermic?

exothermic

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