Rates and energy

Descripción

GCSE Chemistry Additional Science (AQA) Fichas sobre Rates and energy , creado por yusanr98 el 04/04/2014.
yusanr98
Fichas por yusanr98, actualizado hace más de 1 año
yusanr98
Creado por yusanr98 hace casi 11 años
14
0

Resumen del Recurso

Pregunta Respuesta
How can we find out the rate of a chemical reaction? Rate of reaction= Amount of reactant used or amount of product formed ____________________________ time
What affects the rate of a chemical reaction? Temperature, surface area, concentration of solutions or pressure of gases and presence of a catalyst.
How does collision theory explain the effect of surface area on reaction rate? The rate if chemical reaction increases if the surface area of any solid reactant is increased. This increases the frequency of collisions between reacting particles.
How does collision theory explain the effect of temperature on reaction rate? Increasing the temperature increase the rate of reaction because the particles collide more frequently and more energetically. More of the collisions result in a reaction because a higher proportion of particles have energy greater than the activation energy.
How does increasing the concentration of a reactants in solutions affect the rate of reactions? Increasing the concentration of reactants in solutions increases the frequency of collisions between particles, and so increase the rate of reaction.
How does increasing the pressure of reacting gases affect the rate of reactions? Increasing the pressure of reacting gases also increases the frequency of collisions and so increases the rate of reaction.
What is a catalyst? A substance that speeds up the rate of chemical reaction.
Why are catalyst used in so many industrial processes? To increase the rate of reaction and reduce the energy costs.
Exothermic Accompanied by the release of heat.
Endothermic Accompanied by or requiring the absorption of heat.
How is energy involved in chemical reactions. Energy may be transferred to or from the reacting substances in chemical reaction.
Uses of exothermic? Hand warmer and self-heating cans.
Uses of endothermic? Cold packs for sports injuries.
Mostrar resumen completo Ocultar resumen completo

Similar

How much?
yusanr98
Salts and electrolysis
yusanr98
Rates And Energy
stjohntoby
Structure and Bonding
yusanr98
Structure and Properties
yusanr98
Examen Inglés Selectividad
maya velasquez
Biología
Danitza Méndez
5 Pasos para el Éxito en el Aprendizaje_2
Diego Santos
ESTADO DE FLUJOS DE EFECTIVO
Christian Muñoz
LA ACCIÓN DE TUTELA EN EL ORDENAMIENTO CONSTITUCIONAL COLOMBIANO
juli_franco98
Las Ciencias Sociales
Ana Llorach