Rates Of Reaction
Gbogbo ọrọ náà
Some reactions are over in a flash, like the explosion of a firework. Others take millions of years, like the rusting of iron deep underground. What controls how fast a reaction goes, and how can we speed one up or slow one down?
In this lesson you will learn the five factors that affect reaction rate, explain each one using collision theory, interpret rate graphs, and understand how catalysts work by providing an alternative pathway with lower activation energy. Rates questions appear on both Edexcel papers every session.
Ebumnobi
- describe experiments to investigate the effects of changes in surface area of a solid, concentration of a solution, temperature and the use of a catalyst on the rate of a reaction
- describe the effects of changes in surface area of a solid, concentration of a solution, pressure of a gas, temperature and the use of a catalyst on the rate of a reaction
- explain the effects of changes in surface area of a solid, concentration of a solution, pressure of a gas and temperature on the rate of a reaction in terms of particle collision theory
- know that a catalyst is a substance that increases the rate of a reaction, but is chemically unchanged at the end of the reaction
- know that a catalyst works by providing an alternative pathway with lower activation energy
- draw and explain reaction profile diagrams showing ΔH and activation energy
- practical: investigate the effect of changing the surface area of marble chips and of changing the concentration of hydrochloric acid on the rate of reaction between marble chips and dilute hydrochloric acid
- practical: investigate the effect of different solids on the catalytic decomposition of hydrogen peroxide solution
Akọmọ Ojú-ẹkọ
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Ayẹwo Ẹkọ
Ekele diri gi maka imecha ihe karịrị na Rates Of Reaction. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.
Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.
Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.
- Which factor does NOT affect the rate of reaction? A) Temperature B) Concentration C) Colour of the reactants D) Surface area Answer: C
- A catalyst works by: A) Increasing the temperature B) Providing an alternative pathway with lower activation energy C) Increasing the concentration of reactants D) Being used up in the reaction Answer: B
- On a rate graph, the reaction has finished when: A) The gradient is steepest B) The curve levels off C) The curve starts D) The curve crosses the y-axis Answer: B
- Increasing temperature increases rate because: A) It decreases the activation energy B) It increases the frequency of successful collisions C) It removes the need for collisions D) It creates new reactant particles Answer: B
- Crushing a solid reactant into a powder increases the rate by: A) Lowering the activation energy B) Increasing the surface area exposed to other reactants C) Increasing the mass of the solid D) Changing the products of the reaction Answer: B
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Àwọn Ìwé Tó Dáa Láti Kà
Meecha Ajụjụ Ule Ọmarịcha
Ị chọrọ ime ajụjụ ule ọmarịcha gbasara Rates Of Reaction? Budata ngwa Green Bridge CBT iji nweta ajụjụ ule ọmarịcha na nyocha zuru ezu gbasara isiokwu a.
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