null
US
Iniciar Sesión
Regístrate Gratis
Registro
Hemos detectado que no tienes habilitado Javascript en tu navegador. La naturaleza dinámica de nuestro sitio requiere que Javascript esté habilitado para un funcionamiento adecuado. Por favor lee nuestros
términos y condiciones
para más información.
Siguiente
Copiar y Editar
¡Debes iniciar sesión para completar esta acción!
Regístrate gratis
290449
Enthalpy Change Practical
Descripción
Covers the calculations and methods for Enthalpy Change calculations
Sin etiquetas
a2
as
chemistry
energy
chemistry
energy
gce
Mapa Mental por
Madeleine.Dc
, actualizado hace más de 1 año
Más
Menos
Creado por
Madeleine.Dc
hace casi 11 años
79
1
0
Resumen del Recurso
Enthalpy Change Practical
Non-Combustion Reaction
Spontaneous reaction at room temperature
Salt + Water
Enthalpy change of solution
Acid + Alkali
Enthalpy change of neutralisation
Used for both exothermic and endothermic reactions
Combustion Reaction
Specifically measures the heat given out (exothermic)
Method
Measure the mass of the burner before and after
Thermometer records the temperature of the known mass of water
Limitations
Very Inaccurate
Huge losses of heat
Radiation from flame and calorimeter
Conduction through copper calorimeter
Convection from the flame gases passing by calorimeter
Used for the comparison of the heat output of different fuels
If same burner and set-up is used
Q = mcΔT
Calculation
For both experiements
Calculate the change in temperature
Apply mcΔT, using the heat capacity of and mass of water
Calculate the number of moles of reactants
Alcohol for combustion reaction, use mass = mr x mole
Q x 1/moles of burner
Put into KiloJoules
Solution, use moles = conc x vol
Free Energy
ΔG = ΔH - TΔS
ΔS(system) = S(products) - S(reactants)
Entropy
Measure of the disorder in a system
Use the temperature in Kelvin
273 + T in degress
Hess's law cycles can also be applied
If ΔG is positive the reaction is not spontaneous at 298K
Mostrar resumen completo
Ocultar resumen completo
¿Quieres crear tus propios
Mapas Mentales
gratis
con GoConqr?
Más información
.
Similar
Energy Metabolism
hanngeiss
GCSE AQA Physics 1 Energy & Efficiency
Lilac Potato
Acids and Bases
Sarah Egan
Using GoConqr to study science
Sarah Egan
Ionic Bondic Flashcards.
anjumn10
Electrolysis
lisawinkler10
Acids and Bases
silviaod119
Elements, Compounds and Mixtures
silviaod119
Chemistry General Quiz - 2
lauren_johncock
Chemistry Quiz General -3
lauren_johncock
Chemistry Module C2: Material Choices
James McConnell
Explorar la Librería