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iGCSE Chemistry: Energetics (Double)
Terms in this set (9)
What is meant by the term endothermic?
A reaction in which heat energy is taken in (surroundings get colder)
What is meant by the term exothermic?
A reaction in which heat energy is given out (surroundings get hotter)
Explain why experimental values of enthalpy change differ from theoretical values
Heat energy is lost to the surroundings. Not all the reactants are used up.
Use Q=mcΔT and c=4.18J/°C/g. 25cm³ of sulfuric acid is put into a boiling tube. The starting temperature is 21°C. A spatula of iron filings is added. After a while the temperature reaches 33°C. What is the total heat energy change?
State the units of molar enthalpy change.
Are combustion reactions exothermic or endothermic?
Are displacement reactions exothermic or endothermic?
Are neutralisation reactions exothermic or endothermic?
When a solid dissolves, is this process exothermic or endothermic?
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