Term
| What type of reaction are combustion and neutralization |
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Definition
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Term
| Define the term exothermic reaction |
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Definition
| It results in a transfer of heat from the system to the surroundings. The products have less energy or heat content than the reactants. Enthalpy change is negative. |
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Term
| Define the term endothermic reaction |
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Definition
| Results in heat being absorved by by the system from its surroundings. The products have less heat content than the reactants. ΔH is positive |
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Term
| Define the term standard enthalpy change of reaction. |
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Definition
Is the heat energy transferred under standard conditions:
-a temperature of 298K or 25°C
-a pressure of 100 kPa
-concentrations of 1 mole dm-3
-all the substances in their standard state. |
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Term
| Say the formula used to calculate heat energy change when the temperature of a pure substance is changed. |
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Definition
heat change(J)=m(g)c(Jg^-1K^-1)ΔT(K)
where m=mass, c is heat capacity, and ΔT is change in temperature.
1K=1°C |
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