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Heat energy changes in chemical reactions

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卡片总数: 15 张•内容版本: v4•公开卡包•更新时间: 8/1/2026

卡片预览 (15 张)

#1
正面 (问题)

What do the terms exothermic and endothermic mean?

背面 (解答)

Endothermic - a reaction that takes in heat energy from the surroundings. Exothermic - a reaction that gives out energy to the surroundings.

#2
正面 (问题)

Are neutralisation reactions endothermic or exothermic?

背面 (解答)

Exothermic

#3
正面 (问题)

Are displacement reactions endothermic or exothermic?

背面 (解答)

Either exothermic or endothermic.

#4
正面 (问题)

Is a salt dissolving in water endothermic or exothermic?

背面 (解答)

Either exothermic or endothermic.

#5
正面 (问题)

Are precipitation reactions endothermic or exothermic?

背面 (解答)

Exothermic

#6
正面 (问题)

How could you measure the temperature change of a neutralisation reaction?

背面 (解答)

• Measure initial temperature of the solutions. • Mix both reactants in a polystyrene cup. • Record the highest temperature reached. • Calculate the temperature change.

#7
正面 (问题)

When measuring the temperature change of a reaction, heat loss means that measurements may be inaccurate. How could heat loss be minimised during an experiment?

背面 (解答)

• Use polystyrene cup. • Place reaction cup in a beaker full with cotton wool for extra insulation. • Lid on the reaction cup.

#8
正面 (问题)

In terms of bond energies, what happens during a chemical reaction? Describe exothermic and endothermic reactions in terms of bonds breaking/forming.

背面 (解答)

Energy is needed to break bonds and is released when bonds are made. Exothermic: Energy released from breaking bonds is greater than the energy used to make bonds. Endothermic: Energy released in forming new bond is greater than the energy used to break old bonds.

#9
正面 (问题)

What two types of reaction are exothermic?

背面 (解答)

Combustion Neutralisation

#10
正面 (问题)

Give an example of an endothermic reaction

背面 (解答)

Thermal decomposition Photosynthesis

#11
正面 (问题)

How can the energy change of a reaction be calculated from bond energies?

背面 (解答)

Energy change (kJ mol-1) = Total energy of bonds broken - total energy of bonds made.

#12
正面 (问题)

If the energy change of a reaction is negative, is the reaction exothermic or endothermic?

背面 (解答)

Exothermic, energy has been lost to the surroundings.

#13
正面 (问题)

What is a reaction profile?

背面 (解答)

Agraph showing the relative energies of reactants and products, as well as the activation energy of a reaction.

#14
正面 (问题)

Draw a reaction profile for an endothermic reaction

背面 (解答)

https://pmt.physicsandmathstutor.com/download/Chemistry/GCSE/Notes/Edexcel/7-Rates-of-Reaction-and-Energy-Changes/Flashcards%20-%20Topic%207%20Rates%20of%20Reaction%20and%20Energy%20Changes%20-%20Edexcel%20Chemistry%20GCSE.pdf Page 76

#15
正面 (问题)

Draw a reaction profile for an exothermic reaction

背面 (解答)

https://pmt.physicsandmathstutor.com/download/Chemistry/GCSE/Notes/Edexcel/7-Rates-of-Reaction-and-Energy-Changes/Flashcards%20-%20Topic%207%20Rates%20of%20Reaction%20and%20Energy%20Changes%20-%20Edexcel%20Chemistry%20GCSE.pdf Page 78