Year 11 students, check the dates!
Energy changes are an important part of chemical reactions. The interaction of particles often involves transfers of energy due to the breaking and formation of bonds. Reactions in which energy is released to the surroundings are exothermic reactions, while those that take in thermal energy are endothermic. These interactions between particles can produce heating or cooling effects that are used in a range of everyday applications. Some interactions between ions in an electrolyte result in the production of electricity. Cells and batteries use these chemical reactions to provide electricity. Electricity can also be used to decompose ionic substances and is a useful means of producing elements that are too expensive to extract any other way.
You should be able to:
Describe examples of endothermic & exothermic reactions
Explain how to classify reactions as endothermic or exothermic
Explain in detail how to carry out a calorimetry experiment
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You should be able to:
State a use of an exothermic reaction and an endothermic reaction.
Write word & balanced symbol equations for familiar reactions.
Evaluate the uses of exothermic and endothermic reactions.
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You should be able to:
Sketch a generic reaction profile diagram for an exothermic or endothermic reaction.
Label activation energy on a reaction profile diagram.
Identify bonds broken in reactants and new bonds made in products of a reaction.
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You should be able to:
Explain why bond breaking is endothermic and bond making is exothermic.
Define bond energy and identify all the bonds that break and are made in a chemical reaction.
Calculate the energy needed to break the reactant bonds and the energy released when the product bonds are made.
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You should be able to:
Describe a simple cell & a battery
Explain how voltage can be changed in a cell.
Interpret data from an electrochemical cell to determine the reactivity of the metals involved.
Explain why non-rechargeable batteries stop working.
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You should be able to:
Describe a hydrogen fuel cell.
Explain how a hydrogen fuel cell produces electricity.
List the advantages and disadvantages of hydrogen fuel cells.
Explain why hydrogen fuel cells are an alternative to rechargeable cells and batteries.
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