Thermal decomposition reactions, citric acid and sodium hydrogencarbonate.
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What happens to the temperature of the surroundings during an endothermic reaction?
They decrease. The thermometer is included in "the surroundings" so shows the temperature decreasing.
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State two uses of exothermic reactions?
Self-heating cans, hand warmers
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State the law of conservation of energy.
Energy cannot be created or destroyed, it can only transferred from one place to another.
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How does the law of conservation of energy apply to chemistry?
In all chemical reactions, energy is either transferred to the surroundings or from the surroundings.
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What is an exothermic reaction?
A reaction where energy is transferred to the surroundings.
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State two uses of endothermic reactions
Some cooling sports injury packs
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What are reactants?
The substances involved in a chemical reaction
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What are products?
The substances formed when reactants have a chemical reaction
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What is a reaction profile?
A diagram which shows whether the reactants have more or less energy than the products.
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If the reactants have more energy than the products, what kind of a reaction must have taken place?
An exothermic one. The missing energy has been transferred to the surroundings.
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If the reactants have less energy than the products, what kind of a reaction must have taken place?
An endothermic one. The extra energy has been take in by the surroundings.
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Is breaking bonds endothermic or exothermic?
Endothermic. Chemical bonds are strong so require energy to break (like when you have to put energy in to separate magnets from each other)
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Is making bonds endothermic or exothermic?
Exothermic. Energy is released when chemical bonds are formed (like how two magnets move together when close and generate kinetic energy)
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How do we work out the overall energy change of a reaction?
Work out the difference between the energy needed to break all the bonds in the reactants and the energy released to form all the bonds in the products.
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Other cards in this set
Card 2
Front
What happens to the temperature of the surroundings during an endothermic reaction?
Back
They decrease. The thermometer is included in "the surroundings" so shows the temperature decreasing.
Card 3
Front
State two uses of exothermic reactions?
Back
Card 4
Front
State the law of conservation of energy.
Back
Card 5
Front
How does the law of conservation of energy apply to chemistry?
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