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9 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What is an exothermic change? |
An exothermic change is a change in which heat is given out to the surroundings |
Exo = exhale |
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What are the characteristics of exothermic changes? |
- Heat is released from the reactants and transferred to the surroundings (the surroundings refer to the reaction mixture, container and surrounding air) - temperature of the reaction mixture rises. The container feels warmer |
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What are some examples of exothermic changes? |
Physical processes: - Condensation - Freezing - Dissolving of anhydrous salts in water - Dissolving of acids in water Chemical processes: - Combustion of fuels - Respiration - Neutralisation - Corrosion of metals |
Remember 2 from physical and 2 from chemical processes |
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What is an endothermic change? |
An endothermic change is a change in which heat is absorbed from the surroundings |
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What are the characteristics of endothermic changes? |
- Heat energy is absorbed and transferred from the surroundings to the reactants - the temperature of the reaction mixture falls and the container feels cooler |
2 points |
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What are some examples of endothermic changes? |
Physical Processes: - Evaporation - Melting - Dissolving of some ionic compounds in water Chemical Processes: - Photosynthesis - Action of light on silver bromide in photographic film - Thermal decomposition |
3 points for physical and 3 for chemical |
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What process is bond breaking? |
Endothermic process as heat energy is absorbed |
Endothermic or exothermic? |
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What process is bond making? |
Exothermic as heat energy is given out |
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What is incomplete combustion? |
Incomplete combustion is when carbon particles in the form of soot and carbon monoxide are produced when a limited supply of air is used to combust. |
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